Dual-wavelength thermal-lens spectrometry as a sensitive and selective method for trace gas analysis

C. Tran, M. Franko
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引用次数: 11

Abstract

A novel dual-wavelength thermal-lens spectrometer with pump/probe configuration that is capable of simultaneously measuring thermal-lens signals at two different wavelengths has been developed. In this instrument, the two excitation beams are derived from the same argon-ion laser operating in a multiline mode. The sample is excited by these two wavelengths alternately and the corresponding thermal-lens signals are monitored by a He-Ne probe laser. Advantages of this dual-wavelength apparatus include its inherent sensitivity and enhanced selectivity. The selectivity is improved because the ratio of the thermal-lens signals at the two different wavelengths provides fingerprints and allows identification of the sample. Therefore, it can be used not only to detect and identify trace chemical species at very low concentration but also to analyse two-component mixtures. Using this apparatus, the detection limit for NO2 using 30 mW excitation beams modulated at 4.6 Hz is estimated to be 300 PPB.
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双波长热透镜光谱法作为一种灵敏、选择性的痕量气体分析方法
研制了一种新型的双波长热透镜光谱仪,该光谱仪具有泵浦/探针结构,能够同时测量两个不同波长的热透镜信号。在该仪器中,两个激发光束来自同一氩离子激光器在多线模式下工作。样品被这两种波长交替激发,相应的热透镜信号由氦氖探针激光器监测。这种双波长仪器的优点包括其固有的灵敏度和增强的选择性。由于两种不同波长的热透镜信号的比例提供指纹并允许对样品进行识别,因此提高了选择性。因此,它不仅可以用于检测和鉴定极低浓度的痕量化学物质,而且可以用于分析双组分混合物。使用该装置,使用以4.6 Hz调制的30 mW激发光束对NO2的检测极限估计为300 PPB。
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