Interferometric full optical fiber sensor for simultaneously measuring temperature and strain based on FP-MZ structure

• Main Authors: SHANGGUAN CHUNMEI, LOU XIAOPING, LI HONG, ZHU LIANQING, HE WEI, DONG MINGLI, ZHANG WEN
• Format: Patent
• Language: Chinese; English
• Published: 29.06.2018
• Subjects: MEASURING; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS; MEASURING LENGTH, THICKNESS OR SIMILAR LINEARDIMENSIONS; MEASURING QUANTITY OF HEAT; MEASURING TEMPERATURE; PHYSICS; TESTING; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR

The invention discloses an interferometric full optical fiber sensor for simultaneously measuring the temperature and the strain based on an FP-MZ structure. The end faces of single-mode optical fibers are corroded by adopting 40 percent hydrofluoric acid to obtain an optical fiber FP structure; tail fibers of the optical fiber FP are subjected to fusion welding by using a taper waist expansion fusion welding technology to obtain an optical fiber MZ interference structure; a sensor for simultaneously measuring the temperature and the strain is produced, temperature and strain sensing characteristics are tested and analyzed, and a mathematical model between the temperature and the strain of the system and wavelengths of a reflection spectrum and projection spectrum is established; the change of dual parameters, namely external temperature and strain can be simultaneously monitored by a sensing coefficient matrix of the system. The sensor has the advantages of simple structure, low production cost, good measuri