| 1. |
- Ahmad, Jawad, 1985-, et al.
(författare)
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Sitting Posture Recognition using Screen Printed Large Area Pressure Sensors
- 2017
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Ingår i: Proceedings of IEEE Sensors. - : IEEE. - 9781509010127 ; , s. 232-234
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Konferensbidrag (refereegranskat)abstract
- In the biomedical sector, pressure sensors exhibit an important role towards monitoring and recognition of sitting posture for wheelchair users, which is helpful for pressure ulcer prevention and cure. In this paper, a flexible and inexpensive screen printed large area pressure sensing system is presented. The large area sensor comprise three layers, is able to cancel-out false pressure detection, and achieves a sitting classification accuracy over 80 percent. The sensor matrix contains 16 sensors distributed over an area of 23.5 cm × 21.5 cm and the pressure points are monitored at a scanning rate of 77 Hz. The sensor system provides wireless communication and a Windows based GUI is developed that allows real-time presentation of pressure data by means of a pressure map. The presented sensor design targets smart wheelchairs but is suitable for any low cost and high throughput pressure distribution monitoring systems.
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| 2. |
- Bader, Sebastian, 1984-, et al.
(författare)
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A concept for remotely reconfigurable solar energy harvesting testbeds
- 2017
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Ingår i: Proceedings of IEEE Sensors. - : IEEE. - 9781509010127 ; , s. 837-839
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Konferensbidrag (refereegranskat)abstract
- Existing solar energy harvesting systems are typically evaluated with a single configuration. However, results on different harvester configurations are often desired in order to select the appropriate match to specific ambient conditions and application requirements. In this paper, we therefore present a concept for remotely reconfigurable solar energy harvesting testbeds, which allows for multiple harvester configurations to be evaluated with a single system deployment. We demonstrate that such a testbed can be implemented in an efficient manner by utilizing the benefits of wireless sensor networks, resulting in a scalable and flexible system with low power consumption.
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| 3. |
- Halvorsen, Kjartan, et al.
(författare)
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Robust Tracking of Periodic Motion in the Plane using Inertial Sensor Data
- 2017
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Ingår i: Proceedings of IEEE Sensors 2017. - Glasgow, Scotland : IEEE. - 9781509010127 ; , s. 1041-1043
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Konferensbidrag (refereegranskat)abstract
- We propose a robust method for estimating the orientation and displacement of an inertial measurement unit undergoing planar periodic motion. Such movements is a common approximation to human gait and running. We formulate the problem introducing a sparse vector of outlier errors and l1-regularization. The problem thus becomes robust to outliers in the data. The problem can be rewritten as a quadratic programming problem which can be solved efficiently using existing software for convex optimization.
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| 4. |
- Hammarling, Krister, 1968-, et al.
(författare)
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Dual parameter fiber optic sensor combining a Fabry-Perot and a Mach-Zehnder interferometer
- 2017
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Ingår i: Proceedings of IEEE Sensors. - : IEEE. - 9781509010127 ; , s. 1440-1442
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- A new concept for dual parameter fiber optic sensorhas been developed and characterized, both in a two-fiber andsingle-fiber configuration. The liquid sensor measures ethanolconcentration with a stimuli responsive hydrogel whichconstitutes a low finesse Fabry-Perot cavity, and refractive indexwith a Mach-Zehnder type fiber optic interferometer. The two-fiber configuration utilize a fiber optic 1310/1550 nm wavelengthdivision multiplexer to separate the two parameters, while aversatile filtering algorithm extracts and separates the twoparameters in the single-fiber configuration. No cross talk wereobserved for the measured parameters of free spectral range andrefractive index for the two-fiber configurations, while for thesingle fiber configuration cross-talk were observed. The twoconfigurations prove to be versatile dual parametric fiber opticsensor concepts for accurate detection of specific parameters,based on stimuli responsive hydrogels.
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| 5. |
- Xing, Yuxin, et al.
(författare)
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Mobile robot multi-sensor unit for unsupervised gas discrimination in uncontrolled environments
- 2017
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Ingår i: IEEE SENSORS 2017. - New York : Institute of Electrical and Electronics Engineers (IEEE). - 9781509010127 - 9781509010134 ; , s. 1691-1693
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Konferensbidrag (refereegranskat)abstract
- In this work we present a novel multi-sensor unit to detect and discriminate unknown gases in uncontrolled environments. The unit includes three metal oxide (MOX) sensors with CMOS micro heaters, a plasmonic enhanced non-dispersive infra-red (NDIR) sensor, a commercial temperature humidity sensor, and a flow sensor. The proposed sensing unit was evaluated with plumes of gases (propanol, ethanol and acetone) in both, a laboratory setup on a gas testing bench and on-board a mobile robot operating in an indoor workshop. It offers significantly improved performance compared to commercial systems, in terms of power consumption, response time and physical size. We verified the ability to discriminate gases in an unsupervised manner, with data collected on the robot and high accuracy was obtained in the classification of propanol versus acetone (96%), and ethanol versus acetone (90%).
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