High-sensitivity temperature sensor based on cascaded conical dual-mode optical fiber structure and testing device
A technology of temperature sensor and optical fiber structure, which is applied in measuring devices, thermometers with physical/chemical changes, thermometers, etc., can solve the problems of low sensor sensitivity and complex structure, and achieve high sensitivity, improved sensitivity, and controllable free spectral range Effect
Active Publication Date: 2021-01-22
NANJING UNIV OF POSTS & TELECOMM
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However, the above-mentioned sensors either have low sensitivity or complex structures
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[0030] Such as figure 1 Shown, the present invention is based on the highly sensitive temperature sensor of cascaded tapered two-mode fiber structure
[0031] Including a reference tapered two-mode fiber 1-1 and a sensing tapered two-mode fiber 1-2; the reference tapered two-mode fiber 1-1 and the sensing tapered two-mode fiber 1-2 both include a tapered two-mode fiber An optical fiber, wherein the tapered two-mode fiber region includes an undrawn tapered region 1-3, a transition region 1-4 and a fusion tapered region 1-5 connected in sequence, referring to one end of the tapered two-mode fiber 1-1 and the sensing tapered One end of the two-mode fiber 1-2 is connected through a second single-mode fiber 1-6; the other end of the reference tapered two-mode fiber 1-1 is used as an input end, and the sensing tapered two-mode fiber 1-2 is another One end is used as the output end.
[0032] Such as figure 2 As shown, the test device of the present invention based on the high-sen...
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Abstract
The invention discloses a high-sensitivity temperature sensor based on a cascaded conical dual-mode optical fiber structure and a testing device. The sensor comprises a reference conical dual-mode optical fiber and a sensing conical dual-mode optical fiber, the reference conical dual-mode optical fiber and the sensing conical dual-mode optical fiber comprise conical dual-mode optical fibers, the two ends of each conical dual-mode optical fiber are each connected with a first single-mode optical fiber, a conical dual-mode optical fiber area comprises a non-tapering area, a transition area and acone melting area, and the reference conical dual-mode optical fiber and the sensing conical dual-mode optical fiber are connected through a second single-mode optical fiber; and an input end of thesensor is connected with a broadband light source, the output end of the sensor is connected with a spectrograph, and the sensing conical dual-mode optical fiber in the sensor is placed in a temperature controller to form the testing device. The high-sensitivity temperature sensor based on the cascaded conical dual-mode optical fiber structure can be used for accurately and remotely measuring thetemperature variation, especially in occasions such as oil wells and coal mines.
Description
technical field [0001] The invention relates to the technical field of optical fiber sensing, in particular to a high-sensitivity temperature sensor and testing device based on a cascaded tapered two-mode optical fiber structure. Background technique [0002] Temperature is a fundamental and important physical parameter in many fields, such as industrial manufacturing, biomedicine, fuel storage, etc. Especially in oil wells, coal mines and other occasions, it is especially necessary to measure the temperature variation accurately and remotely. Due to the advantages of compact structure and convenient fabrication of fiber optic devices, many fiber optic sensors for temperature monitoring are currently being vigorously developed, which can convert temperature states into measurable optical signals. [0003] So far, various fiber optic temperature sensors have been developed to detect changes in temperature. Today, using fiber gratings, hollow-core fibers, or other special fi...
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IPC IPC(8): G01K11/32G02B6/255
CPCG01K11/32G02B6/2551
Inventor 张祖兴谢李沁
Owner NANJING UNIV OF POSTS & TELECOMM