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Proceedings Paper

Development of high sensitivity pressure sensor using reduced clad FBG
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Paper 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.

Paper Details

Date Published: 9 May 2012
PDF: 7 pages
Proc. SPIE 8439, Optical Sensing and Detection II, 84392G (9 May 2012); doi: 10.1117/12.922160
Show Author Affiliations
P. Vengal Rao, National Institute of Technology, Warangal (India)
K. Srimannarayana, National Institute of Technology, Warangal (India)
P. Kishore, National Institute of Technology, Warangal (India)
M. Sai Shankar, National Institute of Technology, Warangal (India)
D. Sengupta, National Institute of Technology, Warangal (India)
P. Saidi Reddy, National Institute of Technology, Warangal (India)


Published in SPIE Proceedings Vol. 8439:
Optical Sensing and Detection II
Francis Berghmans; Anna Grazia Mignani; Piet De Moor, Editor(s)

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