Abstract
A novel all-silica fiber optic Fabry-Perot (FP) pressure sensor with pressure leading-in tube based on microbubble structure is developed and experimentally demonstrated. The FP cavity is formed by fixing the end face of the single-mode fiber (SMF) parallel to the outer surface of the microbubble, in which the microbubble with a diameter of about 318 μm is constructed at the end of silica hollow tube. When external pressure is transmitted on the inner surface of the microbubble by the pressure leading-in tube, the FP cavity length changes with the diameter of microbubble. Experimental results show that such a sensor has a linear sensitivity of approximately 4.84 nm/MPa at room temperature over the pressure range of 1.1 MPa; the sensor has a very low temperature coefficient of approximately 2 pm/°C from room temperature to 600°C. The sensor has advantages of extremely low temperature coefficient, compact structure, and small size, which has potential applications for measuring pressure in high-temperature environment.
Highlights
Fiber optic Fabry-Perot (FP) sensors have been widely studied for measuring pressure, temperature, strain, vibration, ultrasound, etc. because they have the advantages of simple configuration, rapid response, low cost, and immunity to electromagnetic interference [1,2,3,4,5,6,7]
The FP cavity is formed by fixing the end face of the single-mode fiber (SMF) parallel to the outer surface of the microbubble
The end of the pressure leadingin tube (HST #1) of the fiber optic FP pressure sensor is connected to the pneumatic pump
Summary
Fiber optic Fabry-Perot (FP) sensors have been widely studied for measuring pressure, temperature, strain, vibration, ultrasound, etc. because they have the advantages of simple configuration, rapid response, low cost, and immunity to electromagnetic interference [1,2,3,4,5,6,7]. Liu et al [21] demonstrated an ultrahigh-sensitivity (12.22 nm/kPa) gas pressure sensor based on the FabryPerot interferometer employing a fiber tip diaphragmsealed cavity; the sensor functions well up to a temperature of about 1000°C. A novel all-silica fiber optic Fabry-Perot (FP) pressure sensor with pressure leading-in tube based on microbubble structure is developed and experimentally. When pressure is applied on the inner surface of the microbubble by the pressure leading-in tube, the deflection of the diaphragm of the microbubble will cause the change of FP cavity On these bases, the fiber optic FP pressure sensor system and the experimental setup are established, and the sensing characteristics of the sensor are tested and analyzed. Due to the all-silica structure, the proposed microbubble-based fiber optic FP pressure sensor has a very low temperature coefficient
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