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Temperature and strain detection device and method for FBG (fiber bragg grating) wavelength demodulator based on DFB laser

A technology of DFB laser and wavelength demodulation, which is applied in the direction of measuring devices, optical devices, and thermometers with physical/chemical changes, etc., can solve the problems of low laser utilization rate and complex demodulation system, so as to reduce product cost and improve The effect of precision and simple structure

Inactive Publication Date: 2013-12-11
HARBIN UNIV OF SCI & TECH
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to solve the measurement of temperature and strain in special occasions such as bridges, mines, tunnels, dams, buildings, large-scale power equipment and chemical equipment, as well as the complexity of the demodulation system formed by the tunable filter method, and the low laser utilization rate. low problem

Method used

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  • Temperature and strain detection device and method for FBG (fiber bragg grating) wavelength demodulator based on DFB laser
  • Temperature and strain detection device and method for FBG (fiber bragg grating) wavelength demodulator based on DFB laser
  • Temperature and strain detection device and method for FBG (fiber bragg grating) wavelength demodulator based on DFB laser

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specific Embodiment approach 1

[0024] Specific implementation mode 1: refer to figure 1 , specifically describe this embodiment, the temperature and strain detection device of the FBG wavelength demodulator based on DFB laser described in this embodiment, which includes a tunable DFB light source 1, a 1×2 optical splitter 2, and an F-P etalon 3 , 1×4 optical splitter 4, 5 optical amplifier circuits 5, data collector 6, coupler A13, coupler B14, coupler C15, coupler D16, port stage 17, FBG sensor 18 and standard FBG19, port RJ45 Ethernet port 7, CH1 port 8, CH2 port 9, CH3 port 10, CH4 port 11 and AC220V port 12 are provided on the table 17;

[0025] The AC220V port 12 is used to connect with the external AC 220V power supply, and the AC220V port 12 is simultaneously connected to the power input end of the tunable DFB light source 1, the power input end of the 5-way optical amplifier circuit 5, and the data collector 6. Power input connection;

[0026] The tunable DFB light source 1 outputs an optical sign...

specific Embodiment approach 2

[0032] Embodiment 2: This embodiment further describes the temperature and strain detection device of the FBG wavelength demodulator based on the DFB laser described in Embodiment 1. In this embodiment, the coupler A13, the coupler B14, the coupling Coupler C15 and coupler D16 are implemented with the same coupler.

specific Embodiment approach 3

[0033] Embodiment 3: The method for temperature detection using the temperature and strain detection device of the FBG wavelength demodulator based on the DFB laser described in Embodiment 1:

[0034] Connect the FBG sensor 18 to any one of the CH ports; paste the material to be measured on the FBG sensor 18; use a computer to calculate and display the temperature value of the material to be measured, and complete the temperature of the FBG wavelength demodulator based on the DFB laser detection.

[0035] Working principle: Connect the FBG sensor 18 to any one of the CH ports to ensure that the reflected light signal generated by the FBG sensor can be output to the CH port; after the material to be measured is pasted to the FBG sensor, the FBG sensor generates a reflected light signal, The reflected optical signal is output to the coupler through the CH port, and is output to the 5-channel optical amplifier circuit through the coupler. The 5-channel optical amplifier circuit rec...

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Abstract

The invention discloses a temperature and strain detection device and method for an FBG (fiber bragg grating) wavelength demodulator based on a DFB laser, belonging to the technical field of optical fiber sensing and characteristic test. The device and method are used for realizing temperature and strain measurement in special occasions such as bridges, mines, tunnels, dams, buildings, large electrical equipment and chemical equipment and solving the problems that a demodulation system composed by a tunable filter method is complicated and the laser utilization rate is low. A temperature and strain detection method is realized by use of the device; and when a material to be detected is pasted onto an FBG sensor, the FBG outputs a reflected light signal to a CH port connected therewith, then the reflected light signal is output to a 5-path light amplifying circuit through a coupler and output to an RJ45 Ethernet interface by a data collector, and a computer calculates and displays the result. The device and method disclosed by the invention is applicable to the teaching experiment and scientific research of informatics, optics, physics, measurement, instrument science and the like as well as the temperature and strain monitoring of many special occasions.

Description

technical field [0001] The invention relates to the technical field of optical fiber sensing and characteristic testing, in particular to the measurement of temperature and strain in some special occasions. Background technique [0002] Temperature is an important physical quantity, and the accurate measurement and effective control of temperature has become an important subject in scientific research and production practice. In many cases, it is necessary to know the temperature gradient or spatial temperature distribution in a certain direction, and then to achieve distributed temperature measurement has become a hot research topic in the field of measurement. The distributed optical fiber temperature measurement system only needs one sensing optical fiber, the wiring is very simple, and the system cost is greatly reduced with the increase of the sensing distance. It is a temperature measurement system with very good development prospects at present. [0003] The measurem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D21/02G01K11/32G01B11/16G01K11/3206
Inventor 熊燕玲钟少龙杨文龙沈涛李乔艺梁欢孟帅
Owner HARBIN UNIV OF SCI & TECH