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High sensitivity optical fiber temperature sensor

An optical fiber temperature and high sensitivity technology, used in thermometers, clad optical fibers, and optical devices to transmit sensing components, etc., can solve the problems of complex wavelength measurement, and achieve the effects of easy manufacturing, convenient use and simple structure

Inactive Publication Date: 2008-02-20
TIANJIN UNIV
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of wavelength-encoded optical fiber sensors is that equipment with wavelength demodulation function is required to extract the detected quantity from the wavelength of light, that is, it is necessary to measure the wavelength of light
Compared with intensity measurement, wavelength measurement is more complicated and generally requires spectral analysis to complete

Method used

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Embodiment Construction

[0029] The specific implementation manners of the present invention will be described in detail below in conjunction with the accompanying drawings. As shown in Figure 1, the input single-mode fiber 101 and the output single-mode fiber 105 are standard single-mode communication fibers (G652), with a core diameter of 8.2 μm, a cladding diameter of 125 μm, and a numerical aperture of 0.14. First remove its protective coating, and then use a fiber optic cutter to cut its end face perpendicular to its axis. The core of the multimode fiber is pure silica with a diameter of 125 μm and a length of 55 mm. The cladding 103 of the multimode optical fiber is made of polyimide material with a diameter of 250 μm and a length of 45 mm. Use a fiber cutter to cut its end face perpendicular to its axis. Afterwards, put the single-mode optical fiber and multi-mode optical fiber after end-face treatment into the optical fiber fusion splicer to fuse the three sections of optical fiber together ...

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Abstract

The utility model discloses a high-sensitivity optical fiber temperature transmitter, which belongs to the technical field of fiber optic sensing, and comprises an aluminum or aluminum alloy pipe or box shell; wherein, a segment of multimode optical fiber is arranged hermetically in the pipe or box shell; the core of the multimode optical fiber with a diameter of 50 to 250 Mu m is made of quartz; the covering of the multimode optical fiber is formed by polyimide with a thermo-optical coefficient of minus one ten-thousandth to minus five ten-thousandth per centidegree; one end of the multimode optical fiber is connected with single model input optical fibers, and the other end is connected with single mode output optical fibers; the single mode input and output optical fibers are bonded with the ports of the pipe or box shell with epoxy resin adhesives. The utility model has the advantages of simple structure, easy manufacture, and convenient use. In addition, the utility model reaches a sensitivity of minus three point nine fifteen per centidegree, which is several times or decades of times than that of the prior wavelength encoding type optical fiber temperature sensor, meanwhile has the same wavelength encoding and division multiplex as the fiber bragg grating (FBG).

Description

technical field [0001] The invention relates to an optical fiber temperature sensor, in particular to a high-sensitivity optical fiber temperature sensor with wavelength coding characteristics, which belongs to the field of optical fiber sensing. Background technique [0002] Optical fiber sensing has many incomparable advantages to electrical sensors, such as not being affected by electromagnetic fields and other external environmental changes, high sensitivity, small size, good insulation, and distributed measurement, etc., so it has been paid more and more attention. Many physical quantities such as temperature, strain, displacement, humidity, pressure, sound, vibration, etc. can be measured with high precision using fiber optic sensors. Optical fiber sensing has been widely used in construction, petroleum, chemical industry, transportation, energy, metallurgy, medicine, military industry, food, nuclear industry and other fields. [0003] According to its working princip...

Claims

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Application Information

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IPC IPC(8): G01K11/32G01D5/353G02B6/02G02B1/02
Inventor 李恩邦
Owner TIANJIN UNIV
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