Development of high sensitivity pressure sensor using reduced clad FBG

P. Vengal Rao; K. Srimannarayana; P. Kishore; M. Sai Shankar; D. Sengupta; P. Saidi Reddy

doi:10.1117/12.922160

9 May 2012 Development of high sensitivity pressure sensor using reduced clad FBG

P. Vengal Rao, K. Srimannarayana, P. Kishore, M. Sai Shankar, D. Sengupta, P. Saidi Reddy

Proceedings Volume 8439, Optical Sensing and Detection II; 84392G (2012) https://doi.org/10.1117/12.922160
Event: SPIE Photonics Europe, 2012, Brussels, Belgium

Abstract

This study focused on the development of high sensitivity pressure sensor based on reduced clad FBG encapsulated in a stainless steel cylinder, partially filled with silicon rubber. The sensor works by means of transferring radial or lateral pressure into an axially stretched- strain along the length of the FBG. The experiment is carried out using two different FBG's have core/clad diameters of 9/125μm (FBG1) and 4/80μm (FBG2). FBG2 is chemically etched to reduce the cladding diameter which significantly enhances the pressure sensitivity. The shift of the Bragg wavelength in response to applied pressure is monitored with an optical spectrum analyser (OSA). The measured pressure sensitivity of FBG2 and FBG1 are found to be 5.85 x 10^-2 MPa^-1 and 2.07 x 10^-2 MPa^-1, which are approximately 18870 and 6677 times respectively higher than that can be sensed with a bare FBG. A very good linearity is observed between Bragg wavelength shift and pressure. This compact, low cost and robust design of the sensor can find applications in the areas of low and medium pressure measurement.

Citation Download Citation

P. Vengal Rao, K. Srimannarayana, P. Kishore, M. Sai Shankar, D. Sengupta, and P. Saidi Reddy "Development of high sensitivity pressure sensor using reduced clad FBG", Proc. SPIE 8439, Optical Sensing and Detection II, 84392G (9 May 2012); https://doi.org/10.1117/12.922160

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