Wavelength modulation spectroscopy: combined frequency and intensity laser modulation
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A theoretical model of wavelength modulation spectroscopy that uses a laser diode on a Lorentzian absorption line and the effect of several modulation parameters on the detected signals is evaluated, confirming the relevance of the model.Abstract:
A theoretical model of wavelength modulation spectroscopy that uses a laser diode on a Lorentzian absorption line is presented. This theory describes the general case of a current-modulated semiconductor laser, for which a combined intensity and frequency modulation with an arbitrary phase shift occurs. On the basis of this model, the effect of several modulation parameters on the detected signals is evaluated. Experimental signals measured on an absorption line of CO2 by use of a 2-microm distributed-feedback laser are also presented and validate this analysis. These experimental results agree with the calculated signals, confirming the relevance of the model.read more
Citations
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Simultaneous Measurements of CO and CO2 Employing Wavelength Modulation Spectroscopy Using a Signal Averaging Technique at 1.578 μm
TL;DR: A resolved line pair was selected for simultaneous measurement of carbon monoxide (CO) and carbon dioxide (CO2) in the near-infrared (NIR) region and it is demonstrated that the signal is highly linear with the concentration in the range of 100–800 ppm.
Journal ArticleDOI
Recovery of Absolute Absorption Line Shapes in Tunable Diode Laser Spectroscopy Using External Amplitude Modulation With Balanced Detection
TL;DR: In this article, a method based on a modification to the Hobbs balanced receiver circuit was proposed for background signal nulling when external amplitude modulation of the laser output is used. And the method significantly improved the signal-to-noise ratio to a level comparable with that of the conventional second harmonic wavelength modulation spectroscopy.
Journal ArticleDOI
Recovery of Absorption Line Shapes With Correction for the Wavelength Modulation Characteristics of DFB Lasers
TL;DR: In this paper, a 2-μm wavelength multiquantum-well distributed feedback (DFB) laser was used for CO2 detection in high-noise harsh environments.
Journal ArticleDOI
Quartz-Enhanced Photothermal-Acoustic Spectroscopy for Trace Gas Analysis
Huadan Zheng,Haoyang Lin,Lei Dong,Zhao Huang,Xiaohang Gu,Jieyuan Tang,Linpeng Dong,Wenguo Zhu,Jianhui Yu,Zhe Chen +9 more
TL;DR: In this article, a crystal quartz tuning fork (QTF) was used as a detector to collect and amplify laser-induced photoacoustic and photothermal waves simultaneously for trace chemical analysis, and a wavelength modulation technique was applied to the proposed quartzenhanced photothermal-acoustic spectroscopy (QEPTAS) to improve the detection signal-to-noise ratio.
Journal ArticleDOI
Integrated slotted ring resonator at mid-infrared for on-chip sensing applications
Sarah Shafaay,Mohamed A. Swillam +1 more
TL;DR: In this article, a detailed study of different sensors utilizing the absorption wavelength of both methane and carbon dioxide gases is presented, which mainly operate at the range of mid-infrared wavelengths because it contains the vibrational resonance of the gases of interest.
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