Method for improving stability of infrared gas detection system based on digital potentiometer

A gas detection system, digital potentiometer technology, applied in instruments, measuring devices, scientific instruments, etc., can solve the problems of confusion of light intensity changes, affecting the measurement accuracy and long-term stability of infrared spectrum absorption technology, measurement errors, etc., to eliminate The influence of the instability of the light source, the improvement of the system stability, the effect of a wide range of applications
CN103149172AInactive Publication Date: 2013-06-12SHANDONG UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SHANDONG UNIV
Publication Date
2013-06-12
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a method for improving the stability of an infrared gas detection system based on a digital potentiometer, belonging to the field of gas detection. The method is implemented by a temperature control circuit, a current drive circuit, a DFB (Distributed Feed Back) laser device, a gas chamber, a photoelectric detector, a reference circuit, an amplification circuit, the digital potentiometer, a differential circuit, a filter circuit and a microprocessor. The method is characterized in that the digital potentiometer is taken as a gain resistor of the amplification circuit; and after the variation of a final wave form, acquired by the microprocessor, is processed, the magnification times of a transmission optical path electric signal is changed through feedback regulation on the resistance of the digital potentiometer, so that the aim of automatically compensating the fluctuation, caused by environment factors (except for gas absorption), of the optical power of transmission light, which passes through the gas chamber, is realized, and system measurement errors caused by the fluctuation are overcome. The system is simple in structure and easy to realize, has the characteristics of being high in long-term stability and insensitive to system environment change, and can be widely used in the field of free optical path and optical fiber gas detection.
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Description

technical field

[0001] The invention relates to a method for improving the stability of an infrared gas detection system based on a digital potentiometer. Specifically, the digital potentiometer feedbacks and adjusts the magnification of the electrical signal of the transmission optical circuit to automatically compensate for the transmission light caused by environmental factors (except gas absorption). The method of optical power fluctuation. 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 (SF 6 ) electrical equipment are widely used, specifically including SF 6 Circuit Breaker, GIS Enclosed Combined Appliance, SF 6 Insulated transformers, voltage transformers, current transformers and various high-voltage bushings, etc. And at present, most of the projects under construction with a voltage level of 110kv and ab...

Claims

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