A new fiber optic negative pressure sensor based on pressure-sensitive diaphragm sealed Fabry-Perot cavity which
cascaded to the fiber tip is proposed in this paper. The experiment result shows a highly sensitivity of 101.9 pm/kPa
within the measurement range of 10.0-100.4 kPa, the response and recovery time are, respectively, 4 and 10 second over
the negative pressure variation of 100.4-15.1 kPa and 20.0-110.4 kPa. According to the experiment results, the proposed
sensor possesses the advantages of high sensitivity, fast response and recovery time.
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