Gas modulation refractometry for high-precision assessment of pressure under nonerature-stabilized conditions

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Silander, Isak,1980-Umeå universitet,Institutionen för fysik,Umeå University, Sweden (författare)

Gas modulation refractometry for high-precision assessment of pressure under nonerature-stabilized conditions

Artikel/kapitelEngelska2018

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American Vacuum Society,2018
electronicrdacarrier

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LIBRIS-ID:oai:DiVA.org:ri-33898
https://urn.kb.se/resolve?urn=urn:nbn:se:ri:diva-33898URI
https://doi.org/10.1116/1.5022244DOI
https://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-148832URI

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Språk:engelska
Sammanfattning på:engelska

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Ämneskategori:ref swepub-contenttype
Ämneskategori:art swepub-publicationtype

Anmärkningar

Funding details: 621-2011-4216, VR, Vetenskapsrådet; Funding details: 621-2015-04374, VR, Vetenskapsrådet; Funding details: 2015-0647, Umeå Universitet; Funding details: 2014-06095, Umeå Universitet; Funding text: This research was supported by the EMPIR initiative, which is cofounded by the European Union’s Horizon 2020 research and innovation program and the EMPIR Participating States; the Swedish Research Council (VR), Project Nos. 621-2011-4216 and 621-2015-04374; the Umeå University program VFS (Verifiering for samverkan), 2016:01; and the Vinnova Metrology Programme, Project Nos. 2015-0647 and 2014-06095.
The authors report on the realization of a novel methodology for refractometry - GAs modulation refractometry (GAMOR) - that decreases the influence of drifts in Fabry Perot cavity refractometry. The instrumentation is based on a dual Fabry-Perot cavity refractometer in which the beat frequency between the light fields locked to two different cavities, one measurement and one reference cavity, is measured. The GAMOR methodology comprises a process in which the measurement cavity sequentially is filled and evacuated while the reference cavity is constantly evacuated. By performing beat frequency measurements both before and after the finite-pressure measurement, zero point references are periodically created. This opens up for high precision refractometry under nontemperature-stabilized conditions. A first version of an instrumentation based on the GAMOR methodology has been realized and its basic performance has been scrutinized. The refractometer consists of a Zerodur cavity-block and tunable narrow linewidth fiber lasers operating within the C34 communication channel (i.e., around 1.55 μm) at which there are a multitude of fiber coupled off-the-shelf optical, electro-optic, and acousto-optic components. The system is fully computer controlled, which implies it can perform unattended gas assessments over any foreseeable length of time. When applied to a system with no active temperature stabilization, the GAMOR methodology has demonstrated a 3 orders of magnitude improvement of the precision with respect to conventional static detection. When referenced to a dead weight pressure scale the instrumentation has demonstrated assessment of pressures in the kilo-Pascal range (4303 and 7226 Pa) limited by white noise with standard deviations in the 3.2 N - 1 / 2 - 3.5 N - 1 / 2 mPa range, where N is the number of measurement cycles (each being 100 s long). For short measurement times (up to around 103 s), the system exhibits a (1 σ) total relative precision of 0.7 (0.5) ppm for assessment of pressures in the 4 kPa region and 0.5 (0.4) ppm for pressures around 7 kPa, where the numbers in parentheses represent the part of the total noise that has been attributed to the refractometer. As long as the measurement procedure is performed over short time scales, the inherent properties of the GAMOR methodology allow for high precision assessments by the use of instrumentation that is not actively temperature stabilized or systems that are affected by outgassing or leaks. They also open up for a variety of applications within metrology; e.g., transfer of calibration and characterization of pressure gauges, including piston gauges.

Ämnesord och genrebeteckningar

TEKNIK OCH TEKNOLOGIER Elektroteknik och elektronik Annan elektroteknik och elektronik hsv//swe
ENGINEERING AND TECHNOLOGY Electrical Engineering, Electronic Engineering, Information Engineering Other Electrical Engineering, Electronic Engineering, Information Engineering hsv//eng
NATURVETENSKAP Fysik Atom- och molekylfysik och optik hsv//swe
NATURAL SCIENCES Physical Sciences Atom and Molecular Physics and Optics hsv//eng
Cavity resonators
Fabry-Perot interferometers
Fiber lasers
Fiber optic sensors
Information dissemination
Modulation
Optical fiber communication
Refractometers
Scales (weighing instruments)
Fabry-Perot cavity
Measurement procedures
Narrow linewidth fiber laser
Novel methodology
Orders of magnitude
Standard deviation
Static detections
Temperature stabilization
White noise

Biuppslag (personer, institutioner, konferenser, titlar ...)

Hausmaninger, Thomas,1987-Umeå universitet,Institutionen för fysik,Umeå University, Sweden(Swepub:umu)thha0038 (författare)
Zelan, MartinRISE,Mätteknik(Swepub:ri)MartinZe@ri.se (författare)
Axner, OveUmeå universitet,Institutionen för fysik,Umeå University, Sweden(Swepub:umu)ovax0001 (författare)
Umeå universitetInstitutionen för fysik (creator_code:org_t)

Sammanhörande titlar

Ingår i:Journal of Vacuum Science & Technology. A. Vacuum, Surfaces, and Films: American Vacuum Society36:30734-21011520-8559

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Av författaren/redakt...: Silander, Isak, ...; Hausmaninger, Th ...; Zelan, Martin; Axner, Ove

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TEKNIK OCH TEKNOLOGIER: TEKNIK OCH TEKNO ...; och Elektroteknik oc ...; och Annan elektrotek ...

NATURVETENSKAP: NATURVETENSKAP; och Fysik; och Atom och molekyl ...

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Av lärosätet: RISE; Umeå universitet

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