Distributed optical fiber temperature measuring device for real-time calibration and calibration method

A technology of distributed optical fiber and temperature measurement device, which is applied in measurement devices, thermometer testing/calibration, thermometers with physical/chemical changes, etc., can solve problems such as measurement errors, achieve strong operability, eliminate measurement errors, and structure simple effect

Inactive Publication Date: 2013-03-13
HANGZHOU SENSYS PHOTOELECTRIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the above-mentioned deficiencies in the prior art, the present invention provides a real-time calibration distributed optical fiber temperature measuring device with

Method used

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  • Distributed optical fiber temperature measuring device for real-time calibration and calibration method
  • Distributed optical fiber temperature measuring device for real-time calibration and calibration method
  • Distributed optical fiber temperature measuring device for real-time calibration and calibration method

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0024] Example 1:

[0025] Such as figure 1 As shown, a real-time calibrated distributed optical fiber temperature measurement device includes a pulsed laser source 1, an optical splitter 2, a detector 3, a reference optical fiber box 4, a calibration optical fiber box 5, a measuring optical fiber 6 and a circuit module 7. The output end of the pulse light source 1 is connected to the input end of the optical splitter 2. The first output end of the optical splitter 2 is connected to the reference fiber box 4, the calibration fiber box 5, and the measurement fiber 6 in sequence. The second output end of the optical splitter 2 and the first The three output terminals are connected to the input terminal of the detector 3, and the output terminal of the detector 3 is connected to the circuit module 7.

[0026] The pulse light source 1 is a semiconductor laser light source or a fiber laser light source with a narrow pulse width and high peak power. In this embodiment, a fiber laser li...

Example Embodiment

[0039] Example 2:

[0040] Such as image 3 As shown, a real-time calibrated distributed optical fiber temperature measurement device for a single detector includes a pulsed laser source 1, a beam splitter 2, a detector 3, a reference optical fiber box 4, a calibration optical fiber box 5, a measuring optical fiber 6, and a circuit module 7. And 1×2 optical switch 8. The difference from Embodiment 1 is that a 1×2 optical switch 8 is added between the spectroscope 2 and the detector 3, and the detector 3 is a single detector. The second output terminal and the third output terminal of the optical splitter 2 are respectively connected to the two input terminals of the 1×2 optical switch 8, and the output terminal of the 1×2 optical switch 8 is connected to the detector 3. The input terminal of the detector 3 is connected to the circuit module 7.

[0041] The 1×2 optical switch 8 can be an optical switch with a MEMS structure or a mechanical structure. In this embodiment, an optic...

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Abstract

The invention discloses a distributed optical fiber temperature measuring device and a calibration method. The device comprises a pulse laser source, an optical splitter, a detector, a reference optical fiber box, a calibration optical fiber box, a measuring optical fiber and a circuit module, wherein the temperature of the reference optical fiber box is kept in a low temperature zone, the temperature of the calibration optical fiber box is kept in a high temperature zone, the distributed optical fiber temperature measuring device can be calibrated in real time by usage of the measured temperature of the calibration optical fiber box and the calculated temperature, measurement errors caused by temperature calibration coefficient changes due to the fact that photoelectric devices are affected by the temperature or aged gradually as time goes by are eliminated, the long-term measurement accuracy of the device is improved, and the industrial application demands can be met.

Description

technical field [0001] The invention relates to a distributed optical fiber sensing technology, in particular to a real-time calibrated distributed optical fiber temperature measuring device and a calibration method. Background technique [0002] Distributed fiber optic temperature sensing device (DTS) is an emerging linear fire detection system, which uses the spontaneous Raman scattering effect and optical time domain reflection technology to obtain real-time temperature measurement distributed along the optical fiber. The device can not only measure the temperature in real time, but also accurately locate the fire location. It has the advantages of long measurement distance, no measurement blind area, anti-electromagnetic interference, and is suitable for working in harsh environments such as flammable and explosive. It is used in road traffic tunnels, high-voltage cables, etc. It is widely used in ditch, coal conveyor belt, oil well, dam and other fields. The applicatio...

Claims

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Application Information

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IPC IPC(8): G01K11/32G01K15/00G01K11/324
Inventor 蒋俊丘栋荣卢海洋余俊云肖棽柏
Owner HANGZHOU SENSYS PHOTOELECTRIC
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