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Low Cost Read Out Instrumenation for Fabry-perot Sensors
Mid Sweden University, Faculty of Science, Technology and Media, Department of Electronics Design.
2018 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

In this thesis the work of two earliermaster thesis is combined in order to a prototype for a continuous

monitoring of blood glucose levels(BGL). This system uses GlucoSet AS’s Fabry-Pérot

hydrogel sensor that changes it length based upon the concentration of glucose.

By using a super luminescent light source(SLED) and measuring the reflected spectrum,

information about the changes in length is measured. The reflected light is depended on the

length of the sensor.

A quadrature demodulation technique written by [9] in Matlab is used as a baseline for

Python application, and run on a Raspberry Pi 3b as hardware platform. This makes it possible

to easier expand the graphical user interface. Simulations show that a cavity length frequency

estimations accuracy of ¼ 0.625%, while a QDT phase accuracy of ¼ 0.1458%, computed at ¼ 15

seconds may be achieved with a bandwidth of 42 nm. A higher accuracy is achievable at the cost

of computation time. To power the SLED a driver circuit was designed and assembled, however

due to time constraint no testing with physical sensor was done.

Place, publisher, year, edition, pages
2018. , p. 69
Keywords [en]
blood glucose levels, Fabry-Pérot hydrogel sensor
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:miun:diva-33473Local ID: EL-V16-A2-003OAI: oai:DiVA.org:miun-33473DiVA, id: diva2:1197274
Subject / course
Electronics EL1
Educational program
Masterprogram i elektroniksystem och instrumentation TEIAA 120 AV
Examiners
Available from: 2018-04-13 Created: 2018-04-12 Last updated: 2018-04-13Bibliographically approved

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