Quasi-reciprocal reflection type optical fiber temperature sensor

Abstract

A disclosed quasi-reciprocal reflection type optical fiber temperature sensor is characterized by comprising an ASE light source, the ASE light source is connected with a circulator, the circulator is connected with a polarizer and a PIN photoelectric detector, the polarizer is connected with a temperature sensing unit, the PIN photoelectric detector is connected with a digital signal processor, and the digital signal processor is connected with a signal output and control interface; and a temperature sensing unit comprises a sensing optical fiber and a compensation optical fiber, the two ends of the compensation optical fiber are connected with the polarizer and the sensing optical fiber respectively, and the tail end of the sensing optical fiber is plated with a reflecting film. The temperature sensor is composed of an all-fiber structure, coating of metal materials is not needed, partial discharge does not exist, the sensitivity of the temperature sensor can be improved, the temperature sensing part is of a reciprocal structure, the high-birefringence photonic crystal fiber serves as a sensing fiber, the external interference resistance is high, and the sensitivity is high.

Description

technical field [0001] The invention relates to an optical fiber temperature sensor, in particular to a quasi-reciprocal reflection type optical fiber temperature sensor. Background technique [0002] The development of the Internet of Things technology provides more possibilities for the construction of smart cities. In the intelligent sensing terminals of the Internet of Things, temperature sensing is essential, especially in the fields of environmental monitoring, industrial manufacturing, biomedicine, and agricultural production. Traditional temperature sensors rely on electricity, such as thermal resistors, thermocouples, semiconductor temperature sensors, etc., which are difficult to apply to special environments such as flammable, explosive, high voltage, and strong electromagnetic fields. The optical fiber temperature sensor uses optical fiber to work in the optical transmission and temperature sensing parts. It has the advantages of good insulation, strong anti-elec...

AI Technical Summary

Problems solved by technology

However, the existing optical fiber temperature sensors contain metal devices, such as optical fiber grating temperature sensors coated with metal materials on the fiber cladding or packaged with metal tubes, metals are prone to partial discharges in high voltage and strong electromagnetic field environments, and partial discharges will reduce the measurement temperature sensitivity

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