Optical fiber temperature sensor
An optical fiber temperature and sensor technology, which is applied in thermometers, thermometers and instruments with physical/chemical changes, etc., can solve the problems of high precision consumption, low sensing accuracy, and high cost, and achieve low overall cost, simple sensing structure, and material. low cost effect
Pending Publication Date: 2021-06-15
HAINAN NORMAL UNIV
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[0005] In view of this, the present invention provides an optical fiber temperature sensor, the purpose of which is to solve the problem of low sensing accuracy of the all-fiber sensing structure in the prior art and high cost for improving the accuracy
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[0024] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0025] The embodiment of the present invention discloses an optical fiber temperature sensor, such as figure 1 As shown, including: temperature sensing probe;
[0026] The temperature sensing probe includes a single-mode optical fiber 1, a microcapillary 2 and a glass bubble 3;
[0027] The single-mode optical fiber 1 is welded above the microcapillary 2, and the bottom end of the microcapillary 2 is welded above the glass bubble 3, and the glass bubble 3 is ...
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Abstract
The invention discloses an optical fiber temperature sensor, which comprises a temperature sensing probe, wherein the temperature sensing probe comprises a single-mode optical fiber, a micro capillary tube and a glass bulb; the single-mode optical fiber is welded above the microcapillary, a bottom end of the microcapillary is welded above the glass bulb, and the glass bulb is filled with sensitizing liquid; and a cavity between the cross section of the upper end of the single-mode optical fiber and the liquid level of the sensibilization liquid in the microcapillary is an interference cavity. Compared with a traditional temperature sensing structure of an all-fiber structure, the temperature sensor is advantaged in that sensitivity is effectively improved, the temperature sensing structure can be used in high-precision temperature monitoring, the temperature sensing range can be changed by changing filling liquid in the thermometer structure, the sensing field is expanded, and practicability of the device is effectively improved.
Description
technical field [0001] The invention relates to the technical field of optical fiber temperature sensing, in particular to an optical fiber temperature sensor. Background technique [0002] In the optical fiber temperature sensor, the optical fiber sensing probe is the most important structure, and the temperature sensing is to use the characteristics of various characteristics of the optical fiber (phase, polarization, intensity, etc.) to change with temperature to measure the temperature. [0003] Although the existing optical fiber temperature sensing probes have the characteristics of the integration of sensing and sensing, due to the limitations of the traditional all-fiber sensing structure by its own characteristics, such as low thermo-optic coefficient and low expansion coefficient, etc., it is harmful to the surrounding The temperature change of the environment is not sensitive, and it is difficult to obtain a high-precision sensing effect. Although there are sensi...
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IPC IPC(8): G01K11/32
CPCG01K11/32
Inventor 李林刘兆悦曾丽娜李再金杨红羊大立李志波曲轶赵志斌谢琼涛彭鸿雁刘国军
Owner HAINAN NORMAL UNIV