Diaphragm based high sensitive FBG pressure sensor

Vengal Rao P.; Srimannarayana K.; Sai Shankar M.; Kishore P.

doi:10.1117/12.2021101

22 June 2013 Diaphragm based high sensitive FBG pressure sensor

Vengal Rao P., Srimannarayana K., Sai Shankar M., Kishore P.

Proceedings Volume 8769, International Conference on Optics in Precision Engineering and Nanotechnology (icOPEN2013); 876927 (2013) https://doi.org/10.1117/12.2021101
Event: International Conference on Optics in Precision Engineering and Nanotechnology (icOPEN2013), 2013, Singapore, Singapore

Abstract

A high sensitive pressure sensor based on Fiber Bragg grating (FBG) integrated with a thin metal diaphragm was designed and demonstrated. To enhance the pressure sensitivity FBG is firmly glued across the diameter of the diaphragm. Under pressure, the diaphragm deforms and produces an induced strain along the length of the fiber causes shift in Bragg wavelength of the FBG. Pressure measurement is made by measuring the Bragg wavelength shift against change in pressure. The sensor was tested up to the maximum pressure of 140 psi and the corresponding pressure sensitivity was found to be 0.0204 nm/psi, which is approximately 970 times higher than that can be achieved with a bare FBG. The experimental results show good agreement with the theoretical results and possess good linearity and repeatability. This sensor can be used for the measurement of medium pressure, liquid level and depth of underwater.

Citation Download Citation

Vengal Rao P., Srimannarayana K., Sai Shankar M., and Kishore P. "Diaphragm based high sensitive FBG pressure sensor", Proc. SPIE 8769, International Conference on Optics in Precision Engineering and Nanotechnology (icOPEN2013), 876927 (22 June 2013); https://doi.org/10.1117/12.2021101

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