Optical fiber temperature sensor

An optical fiber temperature sensor, comprising:

• a broadband light source, a first optical fiber patch cord, a first single-mode optical fiber, a single-hole twin-core eccentric core optical fiber, a second single-mode optical fiber, a second optical fiber patch cord and an optical spectrum analyzer;
• two ends of the first optical fiber patch cord are respectively connected to an output end of the broadband light source and an end of the first single-mode optical fiber, the broadband light source is used to provide wide-spectrum light, and the first optical fiber patch cord is used to introduce the wide-spectrum light into the first single-mode optical fiber;
• the other end of the first single-mode optical fiber is connected to an end of the single-hole twin-core eccentric core optical fiber, with the connection point as a first fusion splice point;
• the other end of the single-hole twin-core eccentric core optical fiber is connected to an end of the second single-mode optical fiber, with the connection point as a second fusion splice point, and the first fusion splice point, the single-hole twin-core eccentric core optical fiber and the second fusion splice point are sequentially connected to form an inline Mach-Zehnder interference structure and generate an anti-resonance effect in the broad-spectrum light, wherein impacts of the inline Mach-Zehnder interference structure and the anti-resonance effect on the broad-spectrum light are each related to an ambient temperature of the optical fiber temperature sensor;
• the other end of the second single-mode optical fiber is connected to an end of the second optical fiber patch cord;
• the other end of the second optical fiber patch cord is connected to the optical spectrum analyzer, and the second optical fiber patch cord is used to introduce an optical signal formed by superimposing the inline Mach-Zehnder interference structure and the anti-resonance effect into the optical spectrum analyzer, so that the optical spectrum analyzer determines an ambient temperature of the optical fiber temperature sensor according to the optical signal.