Dual-parameter optical fiber sensor based on cascade connection of multimode and conical fluorine-doped lead sulfide optical fibers

• Main Authors: LI QIANNAN, FU XINGHU, FU YIHUI, BI WEIHONG, FU GUANGWEI
• Format: Patent
• Language: Chinese; English
• Published: 17.11.2023
• Subjects: ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVEREDIN A SINGLE OTHER SUBCLASS; MEASURING; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS; MEASURING LENGTH, THICKNESS OR SIMILAR LINEARDIMENSIONS; MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR; MEASURING QUANTITY OF HEAT; MEASURING TEMPERATURE; PHYSICS; TARIFF METERING APPARATUS; TESTING; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR

The utility model provides a dual-parameter optical fiber sensor based on cascade connection of multimode and conical fluorine-doped lead sulfide optical fibers. The dual-parameter optical fiber sensor comprises an incident optical fiber, a multimode optical fiber, a fluorine-doped lead sulfide optical fiber and an emergent optical fiber, any end of the incident optical fiber is connected with one end of the multimode optical fiber; the other end of the multimode optical fiber is connected with one end of the fluorine-doped lead sulfide optical fiber, and the other end of the fluorine-doped lead sulfide optical fiber is connected with one end of the emergent optical fiber; the middle part of the fluorine-doped lead sulfide optical fiber is of a conical structure. According to the utility model, the multimode optical fiber and the conical fluorine-doped lead sulfide optical fiber are utilized to respectively excite different cladding modes so as to form multimode interference and Mach-Zehnder interference, so