利用MATLAB实现波长调制光谱(WMS)传感器的数字锁定和浓度测量

2017 Third International Conference on Sensing, Signal Processing and Security (ICSSS) Pub Date : 2017-05-04 DOI:10.1109/SSPS.2017.8071619

Manish Chandra, Aditi Sharma, Amrit Roy, A. Venkatesh, S. S. Kamble, J. K. Radhakrishnan, U. K. Singh

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引用次数: 1

摘要

波长调制光谱学(WMS)是一种用于测定气体分子吸收浓度、温度和速度的通用方法。这项技术在工业和科学领域有广泛的应用。基于这些技术的传感器/系统的一个重要组成部分是用于解调的相敏检测，其形式是基于硬件或软件的锁相放大器。本文详细介绍了(a)基于MATLAB的从波长调制光吸收信号中提取谐波(1f和2f)的数字锁相放大器技术，以及(b)基于MATLAB的从1f和2f谐波中计算氧浓度的程序。利用MATLAB实现的数字锁相放大器和浓度计算公式对氧浓度进行了测量。测量的氧气浓度与通过质量流量控制器提供的实际氧气浓度的偏差小于1%。用数字锁相放大器测量的氧浓度与用硬件测量装置测量的氧浓度偏差在0.2%以内。

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Implementation of digital lock-in and concentration measurement for Wavelength Modulation Spectroscopy (WMS) based sensors using MATLAB

Wavelength Modulation Spectroscopy (WMS) using tunable diode laser is a versatile method for determination of concentration, temperature and velocity of absorbing gaseous molecules. This technique finds major application in industrial and scientific areas. An important component of sensors/systems based on these techniques is the phase sensitive detection for demodulation, in the form of hardware or software based lock-in amplifier. This paper presents the details of (a) a MATLAB based Digital Lock-in amplifier technique for extraction of harmonics (1f & 2f), from the wavelength modulated optical absorption signal, and (b) a MATLAB based program for calculating the oxygen concentration from 1f and 2f harmonics. The oxygen concentration has been measured using MATLAB implemented digital lock-in-amplifier and concentration computation formula. The deviation in the measured Oxygen concentration from the actual Oxygen concentration supplied through the mass flow controllers is less than 1%. The oxygen concentration measured using digital Lock-in amplifier has a deviation within 0.2% as compared to measurement from hardware measuring device.

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2017 Third International Conference on Sensing, Signal Processing and Security (ICSSS)

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