Ultrashort optical fiber high temperature and refractive index sensor based on Michelson

• Main Authors: ZHAO LILONG, XIN XIANGJUN, WANG RUICHUN, LIU BO, REN JIANXIN, MAO YAYA, SUN TINGTING, ZHENG JIEWEN, SHEN LEI, WU YONGFENG
• Format: Patent
• Language: Chinese; English
• Published: 21.01.2022
• Subjects: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; MEASURING; MEASURING QUANTITY OF HEAT; MEASURING TEMPERATURE; OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICS; PHYSICS; TESTING; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR

The invention discloses an ultrashort optical fiber high-temperature and refractive index sensor based on Michelson. The ultrashort optical fiber high-temperature and refractive index sensor comprises a first single-mode optical fiber part, a conical structure, a second single-mode optical fiber part and a D-shaped structure which are connected in sequence. An incident light beam is propagated along a fiber core of the first single-mode optical fiber part until encountering a conical structure, a part of light in the fiber core is coupled into a cladding for transmission due to mismatching of a mode field, and two light beams in the fiber core and the cladding are reflected back in a D-shaped structure area at the tail end of the second single-mode optical fiber part; due to the fact that the refractive indexes of transmission paths of the two reflected light beams are different, when the two light beams meet again, a certain phase difference exists, and interference is generated. The manufacturing process is