High Sensitivity and Lossless Fiber Optic Pressure Sensor Based on Flexible Base
A flexible lossless fiber optic pressure sensor of stain has been proposed. It can simplify the processing method and reduce cost of the fabrication. The single-mode optical fiber without any processing was embedded in two flexible polydimethylsiloxane( PDMS) films to form a pressure sensor with"sandwich" structure. Demodulation tests were carried out by using the optical frequency domain reflectometer ( OFDR ) technology. The relationship between the spectrum drift and the micro-strain of the optical fiber under different pressure was measured. And the stress area of the sensor in the experiment is 2.375 mm2 . The experimental results show that the proposed sensor has a sensitivity of 194/kgf,which is 6.47 times higher than bare single-mode optical fiber in the range of 0 kgf to 5 kgf (0～20 MPa). Compared with bare single-mode optical fiber,its measuring range is increased by 5 times. And the sensor has a good repeatability and linearity when varying pressures were applied ranging from 0 kgf to 2 kgf( 0～8 MPa) . In addition,the distributed pressure test proves that the output response of the sensor is great and the sensor has a high spatial resolution.
fiber optic pressure sensorsingle-mode optical fiberpolydimethylsiloxane(PDMS)substrateoptical frequency domain reflectometer(OFDR)
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