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Device and method for detecting concentration of harmful gases in sample gas

A technology for harmful gas and sample gas, which is applied in the measurement of color/spectral characteristics, etc., and can solve the problem of inability to obtain the concentration of harmful gas.

Active Publication Date: 2014-07-02
北京航天益来电子科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The method of detecting the gas concentration in the sample gas in the prior art cannot be used for low concentration measurement, resulting in the inability to obtain the concentration of harmful gases with low concentration in the sample gas

Method used

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  • Device and method for detecting concentration of harmful gases in sample gas
  • Device and method for detecting concentration of harmful gases in sample gas
  • Device and method for detecting concentration of harmful gases in sample gas

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Embodiment Construction

[0048] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0049] Differential optical absorption spectroscopy is a method to invert the concentration of these gases in the atmosphere by using the different differential absorption characteristics of various gas molecules in different wavelength bands when light is transmitted in the gas.

[0050] Differential optical absorption spectroscopy (DOAS) has the following characteristics:

[0051] (1) The DOAS method can measure the concentration of many different gas molecu...

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Abstract

The invention discloses a device and a method for detecting the concentration of harmful gases in a sample gas. The method comprises the following steps of: collimating ultraviolet light beams emitted by an ultraviolet light source by using a first lens group, and removing second large spectral beams from the ultraviolet light beams by using a narrow band pass filter; transmitting the ultraviolet light beams of which the second large spectral beams are filtered off to a flowing cell through an input optical fiber, and after the ultraviolet light beams are absorbed by the sample gas in the flowing cell, focusing the ultraviolet light beams onto an output optical fiber through a second lens group; transmitting the ultraviolet light beams which are absorbed to an incident slit of a spectrograph through the output optical fiber, and splitting by using a monochromator to obtain a light spectrum arranged according to wavelengths; and detecting the light spectrum by using a photoelectric detector, converting optical signals corresponding to various wavelengths into electric signals, performing a differential optical absorption spectroscopy (DOAS) algorithm-based fast Fourier transform on the electric signals, and calculating the concentration of SO2 and NO in the sample gas.

Description

technical field [0001] The invention relates to the field of environmental monitoring, in particular to a device and method for detecting the concentration of harmful gases in sample gas. Background technique [0002] At present, the situation of my country's analytical instrument industry is severe, and almost all precision analytical instruments used for pollution source monitoring rely on imports. With the emphasis on environmental protection in our country, the country has been in urgent need of analytical instruments for pollution source monitoring in the past two years. As the core equipment of the pollution source automatic monitoring product station, the gas analyzer plays a pivotal role in the entire monitoring process. Currently, there is a huge demand for such technical products in the market. However, the price of analytical instruments is high, which cannot be afforded by enterprises, and the maintenance cycle is long and the maintenance cost is high, which to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/33
Inventor 赵淑莉姜培刚曹慧芹项恩岩
Owner 北京航天益来电子科技有限公司
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