Temperature-insensitive refractive index sensor and control method and preparation method thereof

• Main Authors: ZHAO LILONG, WU XIANGYU, LIU BO, REN JIANXIN, MAO YAYA, SUN TINGTING, ZHENG JIEWEN, LI YING, QI ZHIPENG, WANG FENG, WU YONGFENG
• Format: Patent
• Language: Chinese; English
• Published: 16.09.2022
• Subjects: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; MEASURING; OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICS; PHYSICS; TESTING

The invention discloses a temperature-insensitive refractive index sensor and a control method and a preparation method thereof. The temperature-insensitive refractive index sensor is characterized in that an SMF is arranged in an optical fiber fusion splicer by setting proper discharge parameters of the optical fiber fusion splicer, an optical fiber is gently rotated while discharging, and a spiral cone structure is manufactured; and the steps are repeated at the position with the appropriate length away from the spiral cone structures till four spiral cone structures are manufactured. The structure is simple in manufacturing method, and the sensitivity of the conical structure to the liquid refractive index is further enhanced through fusion of the spiral structure and the conical structure. According to the spiral cone structure, a spiral structure is additionally arranged on the basis of a conical structure, the sensitivity of the sensor is greatly improved, and the sensing probe is simple in structure, s