Optical Sensors

Optical evanescent field waveguide Bragg grating pressure sensor

[+] Author Affiliations
Xiaoli Dai

Communications Research Centre,3701 Carling Avenue, P.O. Box 11490 Station H, Ottawa, Ontario K2H 8S2 Canada

Stephen J. Mihailov

Communications Research Centre,3701 Carling Avenue, P.O. Box 11490 Station H, Ottawa, Ontario K2H 8S2 Canada

Chantal Blanchetière

Communications Research Centre,3701 Carling Avenue, P.O. Box 11490 Station H, Ottawa, Ontario K2H 8S2 Canada

Opt. Eng. 49(2), 024401 (February 18, 2010). doi:10.1117/1.3319819
History: Received August 18, 2009; Revised December 04, 2009; Accepted December 28, 2009; Published February 18, 2010
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A ridge waveguide Bragg grating pressure or touch sensor is proposed. The sensor consists of an open-top ridge waveguide Bragg grating with an overlaid pressure sensing polydimethylsiloxane film. The effective index of the guided mode of the waveguide is changed by stress-induced variations in the film refractive index that are caused by increases in pressure normal to the waveguide. Pressure is then measured by monitoring the shift of the Bragg resonance resulting from the changes to the effective index. By using the smaller core size ridge waveguide, and a polymer with smaller Young’s modulus, the sensitivity of the sensor is enhanced. By utilizing the polarization dependence of the sensor response, a temperature-independent pressure sensor can be realized.

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© 2010 Society of Photo-Optical Instrumentation Engineers

Citation

Xiaoli Dai ; Stephen J. Mihailov and Chantal Blanchetière
"Optical evanescent field waveguide Bragg grating pressure sensor", Opt. Eng. 49(2), 024401 (February 18, 2010). ; http://dx.doi.org/10.1117/1.3319819


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