Ultra-small-size optical fiber temperature sensing probe and preparation method thereof

Abstract

The invention relates to an ultra-small-size optical fiber temperature sensing probe and a preparation method thereof, and belongs to the technical field of optical fiber sensing. The probe comprises a single-mode optical fiber and an ultra-small-size cuboid sealed liquid cavity. The cuboid sealed liquid cavity is internally provided with an SU-8 photoresist solution. The cuboid sealed liquid cavity is glued to the center of the tail end surface of the single-mode optical fiber, the diameter of an effective sensing area is smaller than 50 micrometers, and the length is smaller than a 30 micrometers. The optical fiber temperature sensing probe is connected with a wide-spectrum light source and a spectrometer through an optical fiber circulator. A Fabry-Perot interference spectrum can be observed on the spectrometer, the movement of an interference peak center wavelength on the spectrum is monitored so as to demodulate the environment temperature, and the temperature sensing sensitivity is higher than 800 pm/ DEG C. The ultra-small-size optical fiber temperature sensing probe has the advantages that the structure is compact and simple, stability and reliability are realized, the temperature-sensitive liquid material is integrated into the optical fiber temperature sensing probe, and the temperature sensing sensitivity is greatly improved. The invention provides the ideal ultra-small-size optical fiber temperature sensing probe and the preparation method thereof which are applicable to the field of temperature sensing detection.

Description

technical field [0001] The invention relates to an optical fiber temperature sensor and a preparation method thereof, in particular to an ultra-small volume optical fiber temperature sensing probe and a preparation method thereof. Background technique [0002] With the rapid development of the Internet of Things in the "informationization" era, the demand for sensors in daily life and production has grown rapidly, and at the same time, higher requirements have been put forward for sensor technology and research and development. Optical fiber temperature sensor is a new type of sensor, which has unique advantages such as strong anti-electromagnetic interference, small size, light weight, low power consumption, and easy reuse. It is used in temperature monitoring of power grids, oil wells, and coal mines. Aerospace functional composite material integration and other fields have broad application prospects. According to different modulation methods, fiber optic temperature sen...

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Problems solved by technology

[0003] However, there are currently two problems with fiber optic temperature sensors: low temperature sensing sensitivity and large probe volume

On the other hand, the miniaturization of sensing probes is the development trend of sensors. Although the optical fiber material itself has the advantages of small size and light weight, the diameter of the current optical fiber temperature sensing probe is still above the order of millimeters. How to further reduce the size of the optical fiber temperature sensor? The volume of the sensing probe becomes a technical problem

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