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| 5. |
- Bergkvist, Max, et al.
(författare)
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Assessment of microcirculation of the skin using Tissue Viability Imaging: A promising technique for detecting venous stasis in the skin
- 2015
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Ingår i: Microvascular Research. - : Elsevier. - 0026-2862 .- 1095-9319. ; 101, s. 20-25
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Tidskriftsartikel (refereegranskat)abstract
- Background: : Venous occlusion in the skin is difficult to detect by existing measurement techniques. Our aim was to find out whether Tissue Viability Imaging (TiVi) was better at detecting venous occlusion by comparing it with results of laser Doppler flowmetry (LDF) during graded arterial and venous stasis in human forearm skin. Methods: : Arterial and venous occlusions were simulated in 10 healthy volunteers by inflating a blood pressure cuff around the upper right arm. Changes in the concentration of red blood cells (RBC) were measured using TiVi, while skin perfusion and concentration of moving red blood cells (CMBC) were measured using static indices of LDF during exsanguination and subsequent arterial occlusion, postocclusive reactive hyperaemia, and graded increasing and decreasing venous stasis. Results: : During arterial occlusion there was a significant reduction in the mean concentration of RBC from baseline, as well as in perfusion and CMBC (p less than 0.008). Venous occlusion resulted in a significant 28% increase in the concentration of RBC (p = 0.002), but no significant change in perfusion (mean change -14%) while CMBC decreased significantly by 24% (p = 0.02). With stepwise increasing occlusion pressures there was a significant rise in the TiVi index and reduction in perfusion (p = 0.008), while the reverse was seen when venous flow was gradually restored. Conclusion: : The concentration of RBC measured with TiVi changes rapidly and consistently during both total and partial arterial and venous occlusions, while the changes in perfusion, measured by LDF, were less consistent This suggests that TiVi could be a more useful, non-invasive clinical monitoring tool for detecting venous stasis in the skin than LDF.
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| 6. |
- Berglund, Ellinor, et al.
(författare)
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A smartphone application for dispatch of lay responders to out-of-hospital cardiac arrests.
- 2018
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Ingår i: Resuscitation. - : Elsevier BV. - 1873-1570 .- 0300-9572. ; 126, s. 160-165
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Tidskriftsartikel (refereegranskat)abstract
- Dispatch of lay volunteers trained in cardiopulmonary resuscitation (CPR) and equipped with automated external defibrillators (AEDs) may improve survival in cases of out-of-hospital cardiac arrest (OHCA). The aim of this study was to investigate the functionality and performance of a smartphone application for locating and alerting nearby trained laymen/women in cases of OHCA.A system using a smartphone application activated by Emergency Dispatch Centres was used to locate and alert laymen/women to nearby suspected OHCAs. Lay responders were instructed either to perform CPR or collect a nearby AED. An online survey was carried out among the responders.From February to August 2016, the system was activated in 685 cases of suspected OHCA. Among these, 224 cases were Emergency Medical Services (EMSs)-treated OHCAs (33%). EMS-witnessed cases (n=11) and cases with missing survey data (n=15) were excluded. In the remaining 198 OHCAs, lay responders arrived at the scene in 116 cases (58%), and prior to EMSs in 51 cases (26%). An AED was attached in 17 cases (9%) and 4 (2%) were defibrillated. Lay responders performed CPR in 54 cases (27%). Median distance to the OHCA was 560m (IQR 332-860m), and 1280m (IQR 748-1776m) via AED pick-up. The survey-answering rate was 82%.A smartphone application can be used to alert CPR-trained lay volunteers to OHCAs for CPR. Further improvements are needed to shorten the time to defibrillation before EMS arrival.
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| 8. |
- Beygui, Farzin, et al.
(författare)
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Gestione pre-ospedaliera dei pazienti con dolore toracico e/o dispnea di origine cardiaca[Pre-hospital management of patients with chest pain and/or dyspnoea of cardiac origin]
- 2017
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Ingår i: Recenti progressi in medicina. - : Il Pensiero Scientifico Editore. - 2038-1840. ; 108:1, s. 27-51
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Tidskriftsartikel (refereegranskat)abstract
- Chest pain and acute dyspnoea are frequent causes of emergency medical services activation. The pre-hospital management of these conditions is heterogeneous across different regions of the world and Europe, as a consequence of the variety of emergency medical services and absence of specific practical guidelines. This position paper focuses on the practical aspects of the pre-hospital treatment on board and transfer of patients taken in charge by emergency medical services for chest pain and dyspnoea of suspected cardiac aetiology after the initial assessment and diagnostic work-up. The objective of the paper is to provide guidance, based on evidence, where available, or on experts' opinions, for all emergency medical services' health providers involved in the pre-hospital management of acute cardiovascular care.
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| 10. |
- Engström, Gunnar, et al.
(författare)
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Inflammation-sensitive plasma proteins, diabetes, and mortality and incidence of myocardial infarction and stroke: a population-based study.
- 2003
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Ingår i: Diabetes. - : American Diabetes Association. - 1939-327X .- 0012-1797. ; 52:2, s. 442-447
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Tidskriftsartikel (refereegranskat)abstract
- This study explores the relationship of inflammation-sensitive plasma proteins (ISPs) with the prevalence of diabetes and the interrelationships between ISPs and diabetes in the prediction of death and incidence of myocardial infarction and stroke. Plasma levels of fibrinogen, α1-antitrypsin, haptoglobin, ceruloplasmin, and orosomucoid were assessed in 6,050 men, aged 28–61 years. All-cause and cardiovascular mortality and incidence of myocardial infarction and stroke were monitored over 18.7 ± 3.7 years. Prevalence of diabetes (n = 321) was significantly associated with ISP levels among overweight and obese men but not among men with BMI <25 kg/m2. The association was similar for insulin resistance according to homeostasis model assessment. High ISP levels (two or more ISPs in the top quartile) increased the cardiovascular risk among diabetic men. The risk factor-adjusted relative risks for cardiovascular mortality, myocardial infarction, and stroke were 2.8 (CI 1.8–4.5), 2.2 (1.5–3.2), and 2.5 (1.4–4.6), respectively, for diabetic men with high ISP levels (reference: nondiabetic men with low ISP levels). The corresponding risks for diabetic men with low ISP levels were 1.8 (1.1–3.0), 1.3 (0.8–2.1), and 1.2 (0.6–2.5), respectively. In conclusion, in this population-based cohort, diabetes was associated with increased ISP levels among overweight and obese men but not among men with normal weight. High ISP levels increased the cardiovascular risk similarly in diabetic as compared with nondiabetic men.
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| 11. |
- Folke, Carl, et al.
(författare)
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Reconnecting to the biosphere
- 2011
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Ingår i: Ambio. - : Springer Science and Business Media LLC. - 0044-7447 .- 1654-7209. ; 40:7, s. 719-738
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Tidskriftsartikel (refereegranskat)abstract
- Humanity has emerged as a major force in the operation of the biosphere, with a significant imprint on the Earth System, challenging social-ecological resilience. This new situation calls for a fundamental shift in perspectives, world views, and institutions. Human development and progress must be reconnected to the capacity of the biosphere and essential ecosystem services to be sustained. Governance challenges include a highly interconnected and faster world, cascading social-ecological interactions and planetary boundaries that create vulnerabilities but also opportunities for social-ecological change and transformation. Tipping points and thresholds highlight the importance of understanding and managing resilience. New modes of flexible governance are emerging. A central challenge is to reconnect these efforts to the changing preconditions for societal development as active stewards of the Earth System. We suggest that the Millennium Development Goals need to be reframed in such a planetary stewardship context combined with a call for a new social contract on global sustainability. The ongoing mind shift in human relations with Earth and its boundaries provides exciting opportunities for societal development in collaboration with the biosphere-a global sustainability agenda for humanity.
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| 12. |
- Folke, Fredrik, et al.
(författare)
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Acceptance and Commitment Therapy for Depression : A Preliminary Randomized Clinical Trial for Unemployed on Long-Term Sick Leave
- 2012
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Ingår i: Cognitive and Behavioral Practice. - : Elsevier BV. - 1077-7229 .- 1878-187X. ; 19:4, s. 583-594
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Tidskriftsartikel (refereegranskat)abstract
- This preliminaly study investigated the feasibility of a brief Acceptance and Commitment Therapy (ACT) in a Swedish sample of unemployed individuals on long-term sick leave due to depression. Participants were randomized to a nonstandardized control condition (N = 16) or to the ACT condition (N = 18) consisting of 1 individual and 5 group sessions. From pretreatment to 18-month follow-up the ACT participants improved significantly on measures of depression, general health, and quality of life compared to participants in the control condition. The conditions did not differ regarding sick leave and employment status at any time point. The results indicate that ACT is a promising treatment for depression. The need for further refinements of future ACT protocols for this population is discussed.
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| 13. |
- Folke, Fredrik, et al.
(författare)
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Behavioral Activation Between Acute Inpatient and Outpatient Psychiatry : Description of a Protocol and a Pilot Feasibility Study
- 2015
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Ingår i: Cognitive and Behavioral Practice. - : Elsevier BV. - 1077-7229 .- 1878-187X. ; 22:4, s. 468-480
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Tidskriftsartikel (refereegranskat)abstract
- Abstract Gaps in the continuity of care between acute inpatient and outpatient psychiatric services are common and potentially detrimental for service users. In this paper we provide the rationale for and description of a 12-session behavioral activation intervention for acute inpatients with depression and comorbid psychiatric disorders. The intervention was tailored to be initiated during acute inpatient care and to continue after discharge into outpatient services. We also describe a small pilot investigation (N = 13) of the intervention’s preliminary feasibility. Treatment retention, self-ratings, and participants’ adherence to treatment principles indicate preliminary feasibility of behavioral activation in this complex context. Self-rated activation and avoidance improved during the intervention. The value of a parsimonious inpatient therapy that can bridge the gap between services is discussed along with the limitations of this study.
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| 14. |
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| 15. |
- Folke, Fredrik, et al.
(författare)
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Behavioral activation in acute inpatient psychiatry : A multiple baseline evaluation
- 2015
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Ingår i: Journal of Behavior Therapy and Experimental Psychiatry. - : Elsevier BV. - 0005-7916 .- 1873-7943. ; 46, s. 170-181
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Tidskriftsartikel (refereegranskat)abstract
- BACKGROUND AND OBJECTIVES: The present study employed a multiple baseline study design with repeated measures to explore clinical outcomes, therapy mechanisms, and feasibility of Behavioral Activation for persons admitted to inpatient psychiatry.METHODS: Six adult inpatients with depressive symptoms and different psychiatric disorders were randomized to different lengths of baseline standard inpatient treatment. Subsequently a 5-day, 10-session Behavioral Activation protocol was added. Daily self-report outcome and process measures were administered and supplemented with hourly self-reports and clinician assessments before and after each study phase.RESULTS: After a relatively stable baseline, at least four participants showed marked gradual improvements both in terms of outcome as well as activation and avoidance as Behavioral Activation was initiated. The temporal relation between process and outcome differed somewhat across metrics. In most instances however, change in activation and avoidance either coincided or preceded decreased depression.LIMITATIONS: We did not include some relatively common disorders, did not control for the effects of increased attention, did not investigate treatment integrity, and did not conduct follow-up after discharge. Raters were not blind and measures were mainly focused on depressive symptoms. All received concurrent medical treatment.CONCLUSIONS: This preliminary study further supports the promise of Behavioral Activation as an inpatient treatment for persons with a variety of psychiatric disorders. Results also lends preliminary support for the purported mechanisms of Behavioral Activation.
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| 16. |
- Folke, Fredrik, et al.
(författare)
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Exploring the relationship between activities and emotional experience using a diary in a mental health inpatient setting
- 2018
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Ingår i: International Journal of Mental Health Nursing. - : John Wiley & Sons. - 1445-8330 .- 1447-0349. ; 27:1, s. 276-286
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Tidskriftsartikel (refereegranskat)abstract
- Mental health inpatient milieus have repeatedly been found to be associated with passivity, social disengagement, and low levels of interaction with staff. However, little is known about patients' experiences related to different ward activities. In the present study, we aimed to study the reports of activities and associated experiences of patients admitted to acute psychiatric inpatient wards. Disengaged, inactive, and solitary activities were hypothesized to be associated with less reward and more distress than their counterparts. We also aimed to investigate if such activities predicted distress, and if they were associated with clinical severity. Participants (n = 102) recorded their activities along with concurrent ratings of reward and distress in a structured 1-day diary, and nurses provided clinical severity ratings. On average, 3.74 of the 11 hours assessed (34%) were spent doing nothing, only 0.88 hours (8%) were spent with staff, and most of the time was spent in solitude. Doing nothing, being alone, and passivity were associated with the greatest levels of distress and lowest levels of reward, whereas informal socializing demonstrated the opposite pattern. Distress was not predicted by activity or reward when adjusting for baseline distress. Clinical severity was not associated with the amount of time spent alone or the experience of reward during activity. In conclusion, the risk for passivity and social disengagement during admission prevails. This activity pattern could have detrimental emotional consequences and warrants action, but more studies are needed to determine if activity actually precedes emotional experience.
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| 17. |
- Folke, Fredrik, et al.
(författare)
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Exposure and response prevention in the treatment of body dysmorphic disorder : A case series
- 2012
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Ingår i: Pragmatic Case Studies in Psychotherapy. - : National Register of Health Service Psychologists. - 1553-0124. ; 8:4, s. 255-287
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Tidskriftsartikel (refereegranskat)abstract
- This case study investigates the effect of exposure and response prevention in relation to other components present in behavioral therapy for Body Dysmorphic Disorder (BDD). Treatment components were added one at a time in four consecutive phases: A1) Self-Monitoring; B) Therapist Contact; C) Exposure and Response Prevention (ERP); and, A2) Renewed Self-Monitoring. Client assessment involved (a) a daily self-report diary of BDD symptoms throughout treatment and (b) periodic completion of standardized self-report measures tapping BDD symptoms and related symptoms of depression and global functioning. In all, six clients participated in the study. Three clients (Ms. A, Ms. B, and Ms. C) made large or relatively large improvements in their daily self-reported BDD symptoms during the exposure and response prevention treatment phase. A fourth client (Mr. D) did not make such an improvement during this phase, but made overall progress over the course of treatment. All four of these clients achieved statistically significant improvement over baseline on the standardized BDD measure. One client (Ms. E) dropped out of treatment during the ERP phase, and one (Ms. F) chose not to proceed to the ERP phase after receiving education about it. The results indicate that beneficial effects of treatment occurred during the ERP phase for three of the clients, and thus suggest that this component should, in spite of clients’ almost reflexive, initial skepticism, be considered essential in the behavioral treatment of Body Dysmorphic Disorder. The variety of reactions of the different clients to the treatments is documented and discussed, along with an analysis of the factors that differentiated those clients who found the ERP phase helpful and those who did not.
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| 19. |
- Folke, Mia, et al.
(författare)
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Comparative Provocation Test of Respiratory Monitoring Methods
- 2002
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Ingår i: Journal of Clinical Monitoring and Computing. - 1387-1307. ; 17:2, s. 97-103
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Tidskriftsartikel (refereegranskat)abstract
- Objective. The aim of this study was to compare clinically relevant performance of: 1) a prototype respiratory sensor based on capnometry with two alternative signal receptor fixations, 2) a fiberoptic humidity sensor and 3) human visual observation. Comparative provocation tests were performed on volunteers at the Post-Anesthesia Care Unit at Västerås Central Hospital. Methods. The experimental tests involved 10 healthy, voluntary test subjects, instructed to intersperse normal breathing with protocol provocations of breath holding, limb and head movements, and nasal oxygen supplement. The signal outputs from the three respiratory monitoring methods were recorded on a personal computer. The signal analysis included visual categorising of the signals and counting breath events. Recognising that none of the methods could act as reference, events were classified as "unanimous," "majority" or "minority" events depending on how many of the three methods that detected a breath. Results. The average total recording time was 37 minutes per subject. The respiratory rates varied from 6.5 to 19 breaths per minute, with a mean value of 11.4 breaths/minute. The breath hold duration ranged from 18 to 50 seconds. Discrepancies between the three methods were found in more than 20% of the marked events. The most frequent majority events were due to events not recorded by the observer who, on the other hand, contributed the least to minority events. The provocations made by the subjects during the measurement did not increase the rates of majority and minority events, compared to periods of no provocation. The fiberoptic device exhibited a large count of minority events but a smaller contribution to majority events than the capnometry prototype. Conclusions. The capnometry and fiberoptic sensors exhibit differences in responses that may be understood from basic principles. The importance of the physical application of the sensor to the patient was clearly observed. The optimum design remains to be found.
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| 20. |
- Fransén, Jian, et al.
(författare)
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Evaluating topical opioid gel on donor site pain : A small randomised double blind controlled trial
- 2016
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Ingår i: International Journal of Surgery Open. - : Elsevier BV. - 2405-8572. ; 4, s. 5-9
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Tidskriftsartikel (refereegranskat)abstract
- BackgroundAutologous donor skin harvested for transplantation is a common procedure in patients with burns, and patients often feel more pain at the donor site than is justified by the extent of trauma. Topical morphine gels have been thought to have an effect on peripheral opioid receptors by creating antinociceptive and anti-inflammatory effects, which could potentially reduce the systemic use of morphine-like substances and their adverse effects.MethodsWe therefore did a paired, randomised, double-blind placebo study to investigate the effect of morphine gel and placebo on dual donor sites that had been harvested in 13 patients. Pain was measured on a visual analogue scale (VAS) 15 times in a total of 5 days.ResultsThe mean (SD) VAS was 1.6 (2.3) for all sites, 1.5 (2.2) for morphine, and 2.0 (2.5) for placebo. The pain relieving effects of morphine gel were not significantly better than placebo.ConclusionThe assessment of pain at donor sites is subjective, and more systematic and objective studies are needed.
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| 21. |
- Fransen, Jian, et al.
(författare)
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Surveillance of antibiotic susceptibility in a Swedish Burn Center 1994-2012
- 2016
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Ingår i: Burns. - : Elsevier BV. - 0305-4179 .- 1879-1409. ; 42:6, s. 1295-1303
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Tidskriftsartikel (refereegranskat)abstract
- Patients with burn trauma are at risk for infections caused by antibiotic resistant bacteria (ABR) with subsequent increase in morbidity and mortality. As part of the Swedish strategic program against antibiotic resistance in intensive care (ICU-Strama), we have surveyed the distribution of species and ABR in isolates from patients admitted to a Swedish burn center at Linkoping University Hospital from 1994 through 2012. In an international comparison Strama has been successful in reducing the antibiotic consumption among animals and humans in primary care. The aim of this study was to investigate the antibiotic consumption pressure and resistance rates in a Swedish burn unit. Methods: Microbiology data, total body surface area (TBSA), patient days, and mortality were collected from a hospital database for all patients admitted to the Burn Center at the University Hospital of Linkoping from April 1994 through December 2012. Results: A total of 1570 patients were admitted with a mean annual admission rate of 83 patients (range: 57-152). 15,006 microbiology cultures (approximately 10 per patient) were collected during the study period and of these 4531 were positive (approximately 3 per patient). The annual mean total body surface area (TBSA) was 13.4% (range 9.5-18.5) with an annual mortality rate of 5.4% (range 1-8%). The MRSA incidence was 1.7% (15/866) which corresponds to an MRSA incidence of 0.34/1000 admission days (TAD). Corresponding figures were for Escherichia coli resistant to 3rd generation cephalosporins (ESBL phenotype) 8% (13/170) and 0.3/TAD, Klebsiella spp. ESBL phenotype 5% (6/134) and 0.14/TAD, carbapenem resistant Pseudomonas aeruginosa 26% (56/209) and 1.28/TAD, and carbapenem resistant Acinetobacter spp. 3% (2/64) and 0.04/TAD. Conclusions: Our results show a sustained low risk for MRSA and high, although not increasing, risk for carbapenem resistant P. aeruginosa.
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| 22. |
- Färdig, Rickard, et al.
(författare)
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A randomized controlled trial of the illness management and recovery program for persons with schizophrenia.
- 2011
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Ingår i: Psychiatric Services. - : American Psychiatric Association Publishing. - 1075-2730 .- 1557-9700. ; 62:6, s. 606-12
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Tidskriftsartikel (refereegranskat)abstract
- OBJECTIVE: The aim of the study was to evaluate the effects of the illness management and recovery (IMR) program on symptoms and psychosocial functioning of individuals with schizophrenia or schizoaffective disorder in an outpatient setting in Sweden.METHODS: A total of 41 persons with schizophrenia or schizoaffective disorder who were receiving treatment at six psychiatric outpatient rehabilitation centers were randomly assigned to either an IMR group for nine months or to treatment as usual (control condition). Assessments were conducted at baseline, posttreatment (nine months), and follow-up (21 months) and included self-reports and ratings by clinicians (both blind and nonblind to treatment assignment) of illness management, psychiatric symptoms, recovery, coping, quality of life, hospitalization, insight, and suicidal ideation.RESULTS: As measured by self-report and ratings of nonblinded clinicians, IMR program participants demonstrated significantly greater improvement in illness management than participants in the control condition. Ratings of psychiatric symptoms by blinded clinicians using the Psychosis Evaluation Tool for Common Use by Caregivers and self-reported ratings of psychosocial functioning on the Ways of Coping Questionnaire also showed better outcomes than for participants in treatment as usual. A statistically significant decrease in suicidal ideation between baseline and follow-up was found for IMR program participants.CONCLUSIONS: The study supports previous findings and suggests that the IMR program is effective in improving the ability of individuals with schizophrenia to better manage their illness.
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| 23. |
- Färdig, Rickard, et al.
(författare)
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A Randomized Controlled Trial of the Illness Management and Recovery Program for Persons With Schizophrenia
- 2011
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Ingår i: Psychiatric Services. - 1075-2730 .- 1557-9700. ; 62:6, s. 606-612
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Tidskriftsartikel (refereegranskat)abstract
- Objective: The aim of the study was to evaluate the effects of the illness management and recovery (IMR) program on symptoms and psychosocial functioning of individuals with schizophrenia or schizoaffective disorder in an outpatient setting in Sweden. Methods: A total of 41 persons with schizophrenia or schizoaffective disorder who were receiving treatment at six psychiatric outpatient rehabilitation centers were randomly assigned to either an IMR group for nine months or to treatment as usual (control condition). Assessments were conducted at baseline, posttreatment (nine months), and follow-up (21 months) and included self-reports and ratings by clinicians (both blind and nonblind to treatment assignment) of illness management, psychiatric symptoms, recovery, coping, quality of life, hospitalization, insight, and suicidal ideation. Results: As measured by self-report and ratings of nonblinded clinicians, IMR program participants demonstrated significantly greater improvement in illness management than participants in the control condition. Ratings of psychiatric symptoms by blinded clinicians using the Psychosis Evaluation Tool for Common Use by Caregivers and self-reported ratings of psychosocial functioning on the Ways of Coping Questionnaire also showed better outcomes than for participants in treatment as usual. A statistically significant decrease in suicidal ideation between baseline and follow-up was found for IMR program participants. Conclusions: The study supports previous findings and suggests that the IMR program is effective in improving the ability of individuals with schizophrenia to better manage their illness.
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| 24. |
- Glas, Gerie J., et al.
(författare)
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Ventilation practices in burn patients-an international prospective observational cohort study
- 2021
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Ingår i: BURNS & TRAUMA. - : Oxford University Press. - 2321-3868 .- 2321-3876. ; 9
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Tidskriftsartikel (refereegranskat)abstract
- Background: It is unknown whether lung-protective ventilation is applied in burn patients and whether they benefit from it. This study aimed to determine ventilation practices in burn intensive care units (ICUs) and investigate the association between lung-protective ventilation and the number of ventilator-free days and alive at day 28 (VFD-28). Methods: This is an international prospective observational cohort study including adult burn patients requiring mechanical ventilation. Low tidal volume (V-T) was defined as V-T <= 8 mL/kg predicted body weight (PBW). Levels of positive end-expiratory pressure (PEEP) and maximum airway pressures were collected. The association between V-T and VFD-28 was analyzed using a competing risk model. Ventilation settings were presented for all patients, focusing on the first day of ventilation. We also compared ventilation settings between patients with and without inhalation trauma. Results: A total of 160 patients from 28 ICUs in 16 countries were included. Low V-T was used in 74% of patients, median V-T size was 7.3 [interquartile range (IQR) 6.2-8.3] mL/kg PBW and did not differ between patients with and without inhalation trauma (p= 0.58). Median VFD-28 was 17 (IQR 0-26), without a difference between ventilation with low or high V-T (p= 0.98). All patients were ventilated with PEEP levels >= 5 cmH(2)O; 80% of patients had maximum airway pressures <30 cmH(2)O. Conclusion: In this international cohort study we found that lung-protective ventilation is used in the majority of burn patients, irrespective of the presence of inhalation trauma. Use of low V-T was not associated with a reduction in VFD-28.
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| 25. |
- Granstedt, Fredrik, et al.
(författare)
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Gas sensor with electroacoustically coupled resonator
- 2001
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Ingår i: Sensors and Actuators. - 0925-4005. ; 78, s. 161-165
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Tidskriftsartikel (refereegranskat)abstract
- A new configuration for a gas sensor is demonstrated. The configuration consists of an electroacoustic element coupled to an acoustic resonator, such as Kundt's tube, exhibiting a resonance frequency that is related to the velocity of sound, which, in turn is a function of the molecular mass of the gas within the resonator. Electrical impedance measurements were performed, whereby a resonance peak attributable to the resonator was identified. Contributing effects to the quality factor, Q, of the resonance, was analyzed. Predictable shifts of the resonance frequency were observed when adding CO2 and He to air, and when varying the resonator length. Linearity within the experimental accuracy was confirmed. The new sensor configuration offers the potential advantages of smaller size, improved dynamic response, and lower cost. © 2001 Elsevier Science B.V. All rights reserved.
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