一种基于光纤传感的声波远探测传感器研究OACSTPCD

In view of the problems faced by traditional acoustic long-range detection tools in logging, such as "can not going down, uncertainty and data discontinuity", the research on acoustic long-range detection technology based on optical fiber sensing is carried out by using the characteristics of anti-electromagnetic interference, high sensitivity, miniaturization, continuous measurement, and supporting high-speed and large-capacity data transmission of optical fiber sensors. According to the principle of optical fiber sensitization, the thin-slice-based sensitized structure of the optical fiber sensor is proposed, and a structural sensitized optical fiber sensor with a minimum phase noise as low as 1.97 pε/Hz½ is obtained by analyzing the outside diameter of the sensitized structure, the number of sensitized sheets, the gap between the sensitized sheets and the type of sensitized materials on the sensitivity of the sensor, which can significantly increase the amplitude of the acoustic signal by more than 24 times. Meanwhile, the efficient coupling of the acoustic signal based on the FRP (Fiber Reinforced Plastics) package and the effective transmission over a long distance of 8000 meters are verified. Besides, an acoustic remote detection system based on the optical fiber sensor is proposed, combined with sensor array layout and effective packaging, which is expected to realize the effective detection of highly sensitive acoustic signals, and has great application potential in research on downhole noise and acoustic remote detection.