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首页> 外文会议>Iberoamerican Meeting on Optics;Latin American Meeting on Optics, Lasers, and Their Applications;International Commission for Optics Regional Meeting >Photothermal beam deflection applied to SO2 trace detection
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Photothermal beam deflection applied to SO2 trace detection

机译：应用于SO2痕迹检测的光热束偏转

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摘要

We present the application to environmental monitoring of a compact setup for in situ trace gas detection based on photothermal beam deflection (mirage effect) spectroscopy. Gas traces measurements are performed by detecting the time-varying component of the photothermal deflection of a red diode laser beam, propagating inside the region where a pollutant is excited by another laser. In this work, detection of traces of SO2 in a mixture with Nitrogen at atmospheric pressure enclosed in a glass cell, was performed using the fourth-harmonic pulses of a 10 Hz Nd:YAG laser. It was verified by FTIR spectroscopy that negligible SO2 destruction was produced after irradiation of high pressure mixtures with 105 UV pulses. Several beam sizes and propagating angles for the UV and visible laser were tested and evaluated in order to overcome parasitic signals due to unwanted absorption in optical elements. With this setup we reached a detection limit of 5 ppbV in a hundred-second averaging time span but we estimate sub-ppbV levels can be reached by simple changes in the geometry for improving the signal to noise ratio.
机译：我们介绍了基于光热束偏转（Mirage效应）光谱法的原位轨道检测紧凑型气体检测的环境监测。通过检测红色二极管激光束的光热偏转的时变分量来执行气体迹线，通过另一激光器激发污染物的区域内传播。在这项工作中，使用10Hz Nd：YAG激光器的第四谐波进行，在玻璃电池中封闭在玻璃电池中的大气压下与氮气的混合物中SO2的痕量检测。通过FTIR光谱验证，在用105 uV脉冲辐射高压混合物后产生可忽略的SO2破坏。测试和评估用于UV和可见激光器的几个光束尺寸和传播角度，以克服由于在光学元件中的不希望的吸收引起的寄生信号。使用此设置，我们在百秒平均时间跨度达到5个PPBV的检出限，但是通过几何形状的简单变化来提高信号到噪声比来估计子PPBV水平。

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