Abstract:

         We developed a temperature and pressure sensor based on optical F-P cavity and optical Bragg grating, which was used to monitor temperature and pressure in an oil well. It detected pressure by F-P cavity length variation and temperature by the change of optical Bragg grating reflection wavelength. Pressure measuring range is 0~69 MPa. Test and calibration results demonstrate that a better linear relationship exists between F-P cavity length and pressure response, linear fitting degree of 0.999 999. Temperature measuring range is 5~175 ℃, precision of ±1 ℃. Practical applications prove that the sensor can monitor realtime pressure and temperature in an oil well and is reliable.

Key words: pressure, optical Bragg grating, oil well, temperature, F-P cavity