We present a compact, portable and low cost generic interrogation strain sensor system using a fibre Bragg grating configured in transmission mode with a vertical-cavity surface-emitting laser (VCSEL) light source and a GaAs photodetector embedded in a polymer skin. The photocurrent value is read and stored by a microcontroller. In addition, the photocurrent data is sent via Bluetooth to a computer or tablet device that can present the live data in a real time graph. With a matched grating and VCSEL, the system is able to automatically scan and lock the VCSEL to the most sensitive edge of the grating. Commercially available VCSEL and photodetector chips are thinned down to 20 µm and integrated in an ultra-thin flexible optical foil using several thin film deposition steps. A dedicated micro mirror plug is fabricated to couple the driving optoelectronics to the fibre sensors. The resulting optoelectronic package can be embedded in a thin, planar sensing sheet and the host material for this sheet is a flexible and stretchable polymer. The result is a fully embedded fibre sensing system - a photonic skin. Further investigations are currently being carried out to determine the stability and robustness of the embedded optoelectronic components.
|Title of host publication||Vertical-cavity surface-emitting lasers XVI|
|Editors||Chun Lei, Kent D. Choquette|
|Number of pages||8|
|Publication status||Published - Jan 2012|
|Event||Vertical-cavity surface-emitting lasers XVI - San Francisco, CA, United States|
Duration: 25 Jan 2012 → 26 Jan 2012
|Conference||Vertical-cavity surface-emitting lasers XVI|
|City||San Francisco, CA|
|Period||25/01/12 → 26/01/12|
Bibliographical noteGraham C. B. Lee ; Bram Van Hoe ; Zhijun Yan ; Oliver Maskery ; Kate Sugden ; David Webb and Geert Van Steenberge "A compact, portable and low cost generic interrogation strain sensor system using an embedded VCSEL, detector and fibre Bragg grating", Chun Lei and Kent D. Choquette (eds) Proc. SPIE 8276, Vertical-Cavity Surface-Emitting Lasers XVI, 82760E (February 2, 2012).
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- interrogation system
- vertical-cavity surface-emitting laser
- fibre Bragg grating
- flexible polymer skin
- low cost
- flexible optoelectronic package