High-precision optical detection system for thermally induced micro-strain of energy storage battery

• Main Authors: SHEN XINING, WANG RUTIAN, LI CHENG, SHANG HAIKUN, ZHANG JIAWEI, WANG LI, LIU SHULIN, LIAO QIANGQIANG, WANG QIAN, LI YICANG
• Format: Patent
• Language: Chinese; English
• Published: 29.03.2022
• Subjects: MEASURING; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS; MEASURING LENGTH, THICKNESS OR SIMILAR LINEARDIMENSIONS; PHYSICS; TESTING

The utility model discloses a high-precision optical detection system for thermally induced micro-strain of an energy storage battery. The high-precision optical detection system comprises an optical fiber micro-strain sensor, a 3db coupler, a broadband light source, an optical signal demodulation module and a computer, one end of the 3db coupler is connected with the optical fiber micro strain sensor through an optical fiber, the other end of the 3db coupler is connected with the broadband light source and the optical signal demodulation module through optical fibers, and the optical signal demodulation module is connected with the computer; the optical fiber micro strain sensor comprises a capillary tube, plastic plates are arranged at the two ends of an inner cavity of the capillary tube, single-mode optical fibers are inserted into the plastic plates respectively, and a Fabry-Perot cavity with air as a medium is formed between the end faces of the two single-mode optical fibers. The device can accurately