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Optical detection system for measuring concentrations of different gases

A technology for optical detection and gas concentration, which is applied in measuring devices, color/spectral characteristic measurement, material analysis through optical means, etc., to achieve the effect of broad application background, high measurement accuracy and strong anti-electromagnetic interference ability

Inactive Publication Date: 2013-05-22
BEIJING RES INST OF TELEMETRY +1
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Problems solved by technology

Compared with previous gas detection methods, there has not yet been a gas detection method for multiple gas selective measurement and low-frequency modulation and demodulation to achieve concentration measurement

Method used

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  • Optical detection system for measuring concentrations of different gases
  • Optical detection system for measuring concentrations of different gases

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Embodiment Construction

[0012] The present invention will be further described below in conjunction with the accompanying drawings.

[0013] like figure 1 As shown, the measurement of the concentration of various gases is realized through the control of the microprocessor. Since the broadband light source covers the absorption lines of various gases, the broadband light source in the C+L band is very mature at present, and the types of gases that can be measured in this band Including: acetylene (1525nm), ammonia (1544nm), carbon dioxide (1573nm), carbon monoxide (1567nm), etc. Therefore, when measuring the concentration of a certain gas, first select the type of gas to be measured on the display control terminal, and the microprocessor controls the The sawtooth wave amplitude of the signal source drives the adjustable optical filter to scan the gas absorption line, and the concentration of the gas to be measured can be measured through the demodulation circuit behind.

[0014] The realization princ...

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Abstract

The invention discloses an optical detection system for measuring concentrations of different gases. A microprocessor controls a signal source to generate a voltage drive signal and controls the signal source to output a low-frequency sinusoidal modulating signal and a frequency-doubling square wave reference signal, the low-frequency sinusoidal modulating signal is used for carrying out wavelength regulation on output light of an adjustable optical filter, the frequency-doubling square wave reference signal is used for locking the reference input of an amplifier so as to control the output wavelength of the adjustable optical filter for completing the selection of a measuring gas, and a low-frequency modulation and locking amplification technology is selected according to the characteristic of a device for achieving the demodulation of the concentrations of the gases. Compared with a traditional method for measuring the concentrations of different gases, the optical detection system is capable of selectively measuring different gases, achieves concentration modulation by adopting a hardware circuit, and particularly relates to the absorption characteristic of the gas in a near-infrared band and a wavelength-modulation-based locking and amplifying technology. The optical detection system for measuring the concentrations of different gases has the advantages of high integration degree, strong anti-electromagnetic interference capacity, high measuring degree, stable and reliable performance and long service life and the like.

Description

technical field [0001] The present invention relates to an optical detection system for measuring gas concentration, in particular to an optical detection system which can be used for the measurement of various gas concentrations. places of concentration. Background technique [0002] With the continuous development of science and technology, more and more gas concentration detection is involved in industries, mines, environment, transportation, aerospace and other fields. In our country, the rapid development of industrialization has made environmental pollution more and more serious, among which large factories and mining departments discharge a large amount of toxic, harmful, flammable and explosive gases in the production process, which is one of the main sources of environmental pollution. These harmful gases not only have an impact on human health, but also cause serious pollution to the atmosphere, water, etc., destroying the ecological balance. Real-time and accura...

Claims

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Application Information

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IPC IPC(8): G01N21/31G01N21/01
Inventor 郑林史青孙舟璐王鲜然陈青松
Owner BEIJING RES INST OF TELEMETRY
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