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1. (CN104949929) Method and system for correcting incident light fluctuations in absorption spectroscopy

Office : China
Application Number: 201510130336.4 Application Date: 24.03.2015
Publication Number: 104949929 Publication Date: 30.09.2015
Publication Kind : A
IPC:
G01N 21/31
G PHYSICS
01
MEASURING; TESTING
N
INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
21
Investigating or analysing materials by the use of optical means, i.e. using infra-red, visible, or ultra-violet light
17
Systems in which incident light is modified in accordance with the properties of the material investigated
25
Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
31
Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
Applicants: SERVOMEX GROUP LTD.
Inventors: BAHRAM ALIZADEH
RICHARD P. KOVACICH
MARTIN LOPEZ
IAN C. GASKIN
JAMES D. HOBBY
Priority Data: 1405247.6 24.03.2014 GB
Title: (EN) Method and system for correcting incident light fluctuations in absorption spectroscopy
(ZH) 用于在吸收光谱法中修正入射光波动的方法和系统
Abstract: front page image
(EN) The invention provides a method and system for correcting the effect of intensity fluctuations of the transmitted light in an absorption spectroscopy system used for the detection or measurement of chemical species in a medium, whereby one or more modulation bursts are imposed onto a light beam that passes through the medium. This burst signal may be obtained by modulating the bias current of a tunable diode laser, and the modulation burst signal may be optimally at the second harmonic of the modulation frequency of a wavelength modulated beam to allow usage of the same signal path processing used for the spectroscopic detection of the measurand for a second harmonic detection system. The burst signal can be controlled using a smooth window function to minimise the effects of non-linear perturbations that are inherent in tunable diode laser wavelength modulation spectroscopy systems, of optical interference fringes (etalons) and of the residual light absorption by background chemical species or the measurand at the wavelength coinciding with the modulation burst.
(ZH)

一种用于在被用于检测或测量介质中的化学种类的吸收光谱系统中修正透射光的强度波动效应的方法和系统,由此,向通过介质的光束施加一个或多个调制突发。可通过对可调谐二极管激光器的偏流进行调制来获得此突发信号,并且调制突发信号可最佳地处于波长调制光束的调制频率的二次谐波以允许对二次谐波检测系统使用被用于被测对象光谱检测的相同信号路径处理。可以使用平滑窗函数来控制突发信号以使在可调谐二极管激光器波长调制光谱系统中固有的、光学干扰边缘(基准)和由背景化学种类或被测对象在与调制突发一致的波长下进行的残余光吸收的非线性扰动效应最小化。


Also published as:
US20150268095IN925/MUM/2015