Development of high sensitivity pressure sensor using reduced clad FBG
2012
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.
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