Laser wavelength calibration method and device and gas concentration analyzer

A concentration analyzer and calibration gas technology, which is applied to lasers, laser components, phonon exciters, etc., can solve the problems of increasing the difficulty of measurement and the complexity of devices

Active Publication Date: 2019-03-19
NINGBO HAIERXIN OPTOELECTRONICS TECH CO LTD
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Problems solved by technology

However, simultaneous measurement of NO and NH using different techniques 3 Increase the difficulty of measurement and t

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  • Laser wavelength calibration method and device and gas concentration analyzer
  • Laser wavelength calibration method and device and gas concentration analyzer
  • Laser wavelength calibration method and device and gas concentration analyzer

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Embodiment Construction

[0028]Various exemplary embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. It should be noted that the following descriptions of the various exemplary embodiments are merely illustrative in nature and are by no means intended to limit the disclosure and its application or use. That is, the structures and methods herein are presented by way of example to illustrate various embodiments of the structures and methods of this disclosure. However, those skilled in the art will appreciate that they illustrate merely exemplary, and not exhaustive, ways in which the disclosure may be practiced. In addition, relative arrangements of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present disclosure unless otherwise specifically stated.

[0029] Techniques, methods and devices known to those of ordinary skill in the relevant art may not be dis...

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Abstract

The invention relates to a laser wavelength calibration method and device and a gas concentration analyzer. The wavelength calibration method includes the steps: storing a zero-gas secondary harmonicspectrum and a standard concentration secondary harmonic spectrum acquired in calibration; acquiring the secondary harmonic spectrum of gas to be detected; determining the absorption peak center position of the gas to be detected according to the maximum value of an absorption peak when judging that the concentration of the gas to be detected is within a first range, acquiring deviation between the absorption peak center position of the gas to be detected and the absorption peak center position of the standard concentration spectrum and generating feedback signals according to the deviation exceeding a preset value to calibrate wavelengths; determining the absorption peak center position of the gas to be detected according to the similarity of the spectrum of the gas to be detected and thezero-gas spectrum when judging that the concentration of the gas to be detected is within a second range, acquiring deviation between the absorption peak center position of the gas to be detected andthe absorption peak center position of the zero-gas spectrum and generating feedback signals according to the deviation exceeding the preset value to calibrate the wavelengths. The first range is notoverlapped with the second range, and the value of the first range is larger than that of the second range.

Description

technical field [0001] The present disclosure relates to gas concentration detection, and in particular, to measuring trace gas concentrations using mid-infrared lasers. Background technique [0002] In order to reduce nitrogen oxides (NOx) in flue gas emissions X ), coal-fired power plants generally use selective catalytic reduction technology (SCR) or selective non-catalytic reduction technology (SNCR) to denitrify the exhausted flue gas. During denitrification treatment, ammonia water or urea is usually injected into the flue gas, so that the main component ammonia gas and nitrogen oxides chemically react to generate nitrogen and water vapor that are harmless to the environment. Reasonable control of ammonia injection is very important for flue gas denitrification treatment. Too little ammonia injection will lead to low conversion efficiency of nitrogen oxides. Excessive ammonia injection will lead to excessive ammonia gas generation. Excessive ammonia (NH 3 ) will esca...

Claims

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Application Information

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IPC IPC(8): G01N21/39H01S3/10
CPCG01N21/39H01S3/10
Inventor 王胤陆寅康鹏
Owner NINGBO HAIERXIN OPTOELECTRONICS TECH CO LTD
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