An all-silica Fabry-Pérot interferometer (FPI) is demonstrated for high-temperature pressure monitoring.The pressure sensor is fabricated with single mode fiber and silica capillary by CO2 laser.Owing to slight mismatch of thermal expansion coefficient in all-silica structure, it can work stably under Water Chamber Air Break Nut 600°C atmosphere.The influence of the temperature on the pressure sensor was investigated within a temperature range from 25°C to 700°C and a pressure range from standard atmosphere pressure to 4 MPa.
The experimental results show that the wavelength shift versus the pressure at each temperature is linear, which indicates the proposed FPI pressure sensor TV Stand w/Fire has potential applications in industrial reactors, oil and gas wells, and so on.