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An infrared gas detection system with improved detection stability

A gas detection system and stability technology, applied in measurement devices, material analysis by optical means, instruments, etc., can solve the problems of uneven baseline of spectral lines and reduced signal-to-noise ratio at places without absorption, to eliminate environmental changes, The effect of short response time and easy installation

Inactive Publication Date: 2018-04-13
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] There has been a solution to this problem. The idea is to calibrate and adjust the laser output light by generating an analog reference optical signal through a microprocessor, which reduces the system error caused by environmental factors such as temperature to a certain extent. However, due to the difference between the laser output light power and The injection current has a nonlinear relationship, and the baseline of the spectral line at the non-absorbing part obtained by this scheme is not flat, resulting in a decrease in the signal-to-noise ratio

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  • An infrared gas detection system with improved detection stability
  • An infrared gas detection system with improved detection stability
  • An infrared gas detection system with improved detection stability

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Embodiment 1

[0036] Embodiment 1 of the present invention such as Figure 1-3 As shown, an infrared gas detection system that can improve the detection stability includes a temperature control circuit 9, a current drive circuit 10, a DFB laser 1, an optical fiber coupler 2, a gas chamber 3, and a photodetector A (4) And B (11), amplifying circuit A (5) and B (12), differential circuit 6, filtering circuit 7 and microprocessor 8, it is characterized in that DFB laser device 1 is positioned at before fiber one divides two coupler 2, by fiber one Two-point coupler 2 divides one optical path into two paths, one of which reaches the input end of the photodetector A (4) through the gas chamber 3, and the output end of the photodetector A (4) is connected to the input of the amplifier circuit A (5) end; Another road optical path is connected to the input end of photodetector B (11) through optical fiber one-point two coupler 2, and the output end of photodetector B (11) is connected to the input ...

Embodiment 2

[0046] The method for detecting water vapor in the air chamber by using the above-mentioned detection system, the steps are as follows:

[0047] 1) Connect the above-mentioned detection system well, turn on the power supply in the optical path and each circuit, and debug the optical path and each circuit in a normal working state; flush the gas to be tested into the gas chamber;

[0048] 2) Constant temperature control of the DFB laser through the temperature control circuit: use the microprocessor to generate a current change range of 48mA within a time interval of 0.03S, and the change process increases from 24mA to 72mA, and then from 72mA to high to low 24mA reciprocates, the set current change is realized by the voltage signal output by the microprocessor in the form of sine wave; because the change of the driving current of the DFB laser will cause the change of the output wavelength of the DFB laser, the setting in the microprocessor The voltage change output makes the ...

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Abstract

The invention discloses an infrared gas detection system capable of improving detection stability, which belongs to the detection technical field of infrared gas, and comprises a distributed feed back (DFB) laser, wherein the DFB laser is arranged before an optical fiber one-to-two coupler, an optical circuit is divided into two circuits through the optical fiber one-to-two coupler, one circuit arrives a photoelectric detector A through an air chamber, an output of the photoelectric detector A is connected with an amplifying circuit A, another one circuit is connected onto a photoelectric detector B through the optical fiber one-to-two coupler, an output of the photoelectric detector B is connected with an amplifying circuit B, the output ends of the amplifying circuits A and B are respectively connected with two input ends of a difference channel, output ends of the amplifying circuits A and B are connected with a filter circuit, an output end of the filter circuit is connected with a microprocessor, the microprocessor is respectively connected with a temperature control circuit and a current driving circuit, and the output ends of the temperature control circuit and the current driving circuit are respectively connected with the DFB laser. The infrared gas detection system capable of improving detection stability is simple in structure and easy to achieve, has high long-term stability, overcomes system measuring errors in the prior art, and can be widely applied in the detection field of optical fiber gas.

Description

technical field [0001] An infrared gas detection system capable of improving detection stability belongs to the technical field of infrared gas detection. Background technique [0002] The detection of micro-moisture content plays an important role in the power industry. Since the mid-1980s, with the rapid development of the power industry, sulfur hexafluoride (SF6) electrical equipment has been widely used, including SF6 circuit breakers, GIS closed combination appliances, SF 6 insulated transformers, voltage transformers, current Transformers and various high-voltage bushings, etc. And at present, in projects with a voltage level of 110kv and above, SF6 switchgear is basically used. These electrical equipment play a very important role in the power system. The reliability of its operation is not only related to the SF6 electrical equipment itself, but also affects the safety of other equipment and even the entire power grid. [0003] During operation, SF6 gas will be de...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/3504G01N21/01
Inventor 朱存光陶雪辰王仁德王光伟王朋朋孙红郑志丽
Owner UNIV OF JINAN