High-sensitivity optical fiber temperature sensing probe and manufacturing method thereof

Abstract

The present invention discloses a high-sensitivity optical fiber temperature sensing probe and a manufacturing method thereof. A probe body is internally provided with a confined space, the side wallof the confined space is provided with incident and emergent window, the confined space comprises a first tube cavity and a second tube cavity which communicate in a direction far away from the incident and emergent window in order, and the first tube cavity is filled with a volatile liquid. Through adoption of the high-sensitivity optical fiber temperature sensing probe with optimal design, the confined space is filled with the volatile liquid, the temperature sensing expanding features of the volatile liquid are employed, the refractive index of the volatile liquid is changed with the changeof the environment temperature to achieve flexible modulation of the refractive index and temperature sensing of the incident liquid surface so as to achieve low-cost temperature sensitive detection.The present invention further discloses a manufacturing method of a high-sensitivity optical fiber temperature sensing probe.

Description

technical field [0001] The invention relates to the technical field of optical fiber sensing, in particular to a high-sensitivity optical fiber temperature sensing probe and a manufacturing method thereof. Background technique [0002] With the rapid development of the Internet of Things in the "informatization" era, the demand for temperature sensors in daily life and production is increasing rapidly. As a new type of sensor, fiber optic temperature sensors have strong anti-electromagnetic interference capabilities, small size, light weight, and low power consumption. , Easy to reuse and other unique advantages, it has broad application prospects in power grids, oil wells, coal mine temperature monitoring, marine environment monitoring and other fields. According to different modulation methods, fiber optic temperature sensing probes can be divided into intensity modulation type, wavelength modulation type, phase modulation type, etc. However, since the ordinary silica fib...

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Problems solved by technology

However, the use of wide-spectrum light sources and spectrometers increases the cost and difficulty of demodulation, and increases the size and power consumption of the fiber-optic temperature sensor demodulation system

The intensity-modulated optical fiber temperature sensing probe directly uses the power meter to monitor the optical power signal, which greatly reduces the cost and difficulty of demodulation. It will be limited by the melting point and boiling point temperature, so the detection range of fiber optic temperature probes based on polymer or liquid sensitization is often too small, generally less than 100°C

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