A new type of POTDR distributed optical fiber sensor

Abstract

Based on the importance of pipeline monitoring and maintenance in the oil and gas industry, the advantages and advantages of sensors based on the principle of Brillouin Optical Time Domain Reflectance (BOTDR) and Polarized Optical Time Domain Reflectance (POTDR) in oil and gas pipeline monitoring are discussed. Insufficiency, because the BOTDR[1] principle sensor has been applied in the monitoring of oil and gas pipelines, the application value of the POTDR principle sensor in the monitoring of oil and gas pipelines was discussed, and a POTDR[2] sensing system with fiber grating was designed. The grating enhances the intensity of the reflected signal light, which can effectively improve the signal-to-noise ratio of the sensing system and make the measurement of vibration more accurate. Not only vibration, but the influence of pressure, temperature, magnetic field and other physical quantities along the optical fiber will also cause the polarization state of the light wave to change. By collecting and analyzing the change in the polarization state of the light wave, the change in the physical quantity that caused the change in the polarization state of the light wave can be reversed, so as to realize the measurement of physical quantity. The method is stable, feasible, clear in principle, and low in cost, and its application value in the future cannot be underestimated.