Background Elimination Method Based on Harmonic Detection in No Absorption Spectral Region

Rui, 张锐 Zhang; Xuehong, 赵学玒 Zhao; Yajun, 胡雅君 Hu; Yuan, 郭媛 Guo; Yanli, 刘艳丽 Liu; Yan, 汪曣 Wang

doi:10.3788/aos201333.0430006

光学学报

2013

DOI: 10.3788/aos201333.0430006

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Background Elimination Method Based on Harmonic Detection in No Absorption Spectral Region

张锐 Zhang Rui¹,

赵学玒 Zhao Xuehong²,

胡雅君 Hu Yajun³

et al.

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A new method of background elimination and baseline correction for the first harmonic

Zhang¹,

Zhao²,

Ya-Jun³

et al. 2014

Acta Phys. Sin.

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A new method of background elimination and baseline correction is proposed, since there are background signal and larger baseline signal in the first harmonic (1f) of the tunable diode laser absorption spectroscopy (TDLAS). The laser-associated intensity modulation signal, electronic noise, and optical interference fringes of the 1f background are analyzed. Harmonic detection in none absorption spectral region (HDINASR) is used to eliminate the background signal. Then the relationship curve between current and intensity is given in different operating temperatures to design a remaining baseline correction method after eliminating the background. The principle of background signal searching and the LabView software flow chart are also given. The TDLAS experimental system is designed to detect hydrogen fluoride (HF) gas. According to spectral line selection principle, the absorption line -1312.59 nm is selected, whose operating temperature is set at 27.0 ℃ and the background temperature is set at 30.2 ℃. After eliminating the background and correcting the baseline, signal distortion is significantly improved and baseline is corrected. Then it is verified that the method is valid at other operating temperature of the laser (26.7-27.2). And the improvement of HF gas concentration is quantitatively analyzed. It is convenient for the subsequent processing of 1f signal.

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A new method of background elimination and baseline correction for the first harmonic

Zhang¹,

Zhao²,

Ya-Jun³

et al. 2014

Acta Phys. Sin.

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Laser characteristic effect on the trace gas detection

Zhang¹,

Zhao²,

Zhao³

et al. 2014

Acta Phys. Sin.

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In this paper, we study the effects of laser scanning step length and width characteristic on tunable diode laser absorption spectrum detection system, theoretically derive the principle of interaction between laser and gas absorption line, and analyse the principle of effects of step duration and height about scanning signal (ramp) on the laser central wavelength. After setting the simulation parameters, the curve between the number of ramp steps and the maximum scanning error is obtained. If the scanning signal has 4000 steps in one cycle, the error is less than 1‰ with full width at half maximum (FWHM) value being greater than 0.01 cm-1. The curves between laser linewidth and maximum amplitude or linewidth error are simulated, and also the relationship between laser linewidth and minimum FWHM is given with linewidth error maximum values being 1% and 0.5%. On condition that temperature coefficient n is 0.9 and air-broadened coefficient is 0.005, this paper gives the relationship among pressure, temperature and FWHM, from which the suitable pressure P and temperature T range are deduced. It can provide the relevant theoretical basis for selecting the laser and gas absorption lines and also for improving the system detection limit.

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Background Elimination Method Based on Harmonic Detection in No Absorption Spectral Region

Cited by 2 publications

References 0 publications

A new method of background elimination and baseline correction for the first harmonic

A new method of background elimination and baseline correction for the first harmonic

Laser characteristic effect on the trace gas detection

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