Pipeline cleaner positioning method based on linear Sagnac distributed optical fiber vibration sensing

• Main Authors: YAO GUOBIN, LI YEBIN, LEI JIPENG, GUO ZHIHONG, WANG RUIQI
• Format: Patent
• Language: Chinese; English
• Published: 30.07.2021
• Subjects: BLASTING; HEATING; LIGHTING; MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC ORINFRASONIC WAVES; MEASURING; MECHANICAL ENGINEERING; PHYSICS; PIPE-LINE SYSTEMS; PIPE-LINES; STORING OF DISTRIBUTING GASES OR LIQUIDS; TESTING; WEAPONS

The invention discloses a pipeline cleaner positioning method based on linear Sagnac distributed optical fiber vibration sensing in the technical field of distributed optical fiber vibration sensing. The method specifically comprises the following steps: S1, selecting one core of a long-distance pipeline accompanying communication optical fiber as a sensing optical fiber; S2, connecting the selected sensing optical fiber to a tracking and positioning system of a pipeline cleaner according to the requirements of the technical scheme; S3, a signal analysis upper computer system controlling a data acquisition card to acquire interference signal data at a 3*3 coupler in real time; S4, the signal analysis upper computer system carrying out Fourier transform on the acquired interference signal data in real time; S5, analyzing the obtained frequency domain spectrum data, and searching multiple zero frequency points in the spectrum; and S6, analyzing a distance value from one vibration position to the tail end of the