Data processing method and system for ultraviolet differential gas analyzer

A data processing system and gas analyzer technology, applied in the measurement of color/spectral characteristics, etc., can solve the problems of low accuracy and low reliability, and achieve the effect of reducing the impact, reducing the impact of noise, and ensuring reliability.

CN104458630AActive Publication Date: 2015-03-25CHONGQING CHUANYI AUTOMATION
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2015-03-25

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Abstract

The invention discloses a data processing method for an ultraviolet differential gas analyzer. The method comprises the following steps: acquiring dark spectrum data; acquiring source spectrum data of detected gas; performing nonlinear compensation correction on the source spectrum data with the dark spectrum data and the source spectrum data as parameters, thereby obtaining target spectrum data; calculating the pseudo concentration value of the detected gas corresponding to the target spectrum data by a differential optical absorption spectroscopy method; and calculating the concentration value of the detected gas which the pseudo concentration value corresponds to according to a stepped judgment method. On one hand, the method disclosed by the invention can reduce noise effect on a spectrometer brought about by temperature, humidity and the like and ensures the reliability of data, and on the other hand, the method reduces the influence on high concentration gas and low concentration gas brought about by detection environments and improves the detection precision. In addition, the invention further discloses a data processing system for the ultraviolet differential gas analyzer.
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Description

technical field

[0001] The invention relates to the technical field of differential absorption spectroscopy, in particular to a data processing method and system of an ultraviolet differential gas analyzer. Background technique

[0002] The ultraviolet differential gas analyzer is mainly used to measure the concentration value of gas, and is widely used in industrial sites and testing institutions. The principle of the ultraviolet differential gas analyzer is to use the differential absorption spectroscopy technique.

[0003] Differential absorption spectroscopy technology is a spectral monitoring technology. Its basic principle is to use the narrow-band absorption characteristics of gas molecules in the air to identify gas components, and to deduce the concentration of trace gases according to the narrow-band absorption intensity.

[0004] The current data processing method of the ultraviolet differential gas analyzer directly adopts the calculation result of the different...

Examples

Embodiment 1

[0070] figure 1 It is a flowchart of a data processing method of an ultraviolet differential gas analyzer provided by the present invention. The data processing methods of the ultraviolet differential gas analyzer include:

[0071] S10: Obtain dark spectrum data;

[0072] The dark spectrum refers to the data collected by the spectrometer when the light source is turned off during the detection process and there is no detected gas or the gas is nitrogen. In a specific implementation, the dark spectral data D P It is obtained during initialization and is a one-dimensional array with a size of 2048.

[0073] S11: Acquiring source spectral data of the measured gas;

[0074] Source spectral data S P The acquisition is the data collected by the spectrometer when the light source is turned on in the detection environment and the detection gas is passed through. When the detection gas is passed through, a set of absorption spectra can be obtained, that is, the source spectral da...

Embodiment 2

[0119] Figure 4 It is a structural diagram of a data processing system of an ultraviolet differential gas analyzer provided by the present invention. The data processing system of the ultraviolet differential gas analyzer, including:

[0120] Dark spectrum data acquisition unit 40, for acquiring dark spectrum data;

[0121] A source spectral data acquisition unit 41, configured to acquire source spectral data of the measured gas;

[0122] A correction unit 42, configured to use the dark spectral data and the source spectral data as parameters to perform nonlinear compensation correction on the source spectral data, and obtain target spectral data;

[0123] A pseudo-concentration value calculation unit 43, configured to calculate the pseudo-concentration value of the measured gas corresponding to the target spectral data by using a differential absorption spectroscopy method;

[0124] The concentration value calculation unit 44 is configured to calculate the concentration v...