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在吸收光谱检测技术中,常利用多次反射池技术增加吸收气体的光程长度,以提高灵敏度,降低检测极限。通过综合传统的多次反射Herriott池和White池的优点,利用White池的三镜光学结构和Herriott池的光路传输原理,设计出了一种新型的长光程多次反射池,其结构简单、外形紧凑、光程可调、性能稳定并且小型化。将研制出的基长20cm、光程范围10～100m可调的新型多次反射池应用于可调谐二极管激光吸收光谱技术中进行一氧化碳气体的探测,结合数字信号处理技术可把现场检测的灵敏度提高到10-6量级。实验结果显示这种新型多次反射池在吸收光谱技术中应用良好,与传统同基长的反射池相比,气体检测灵敏度有了明显的提高。
In the absorption spectrum detection technology, often using multiple reflection cell technology to increase the optical path length of the absorption gas to increase the sensitivity and reduce the detection limit. By combining the advantages of the traditional Herriott cell and the White cell with multiple reflection, the principle of the three mirrors of the White cell and the light transmission of the Herriott cell are used to design a novel long-path multi-reflection cell with a simple structure, Compact, adjustable optical path, stable performance and miniaturization. The new multi-reflection cell with base length of 20cm and optical path range of 10 ~ 100m is developed for the detection of carbon monoxide gas in tunable diode laser absorption spectroscopy. The sensitivity of field detection can be improved by combining digital signal processing To 10-6 magnitude. The experimental results show that the new multi-reflection cell has good application in absorption spectroscopy, and the gas detection sensitivity has been significantly improved compared with the traditional reflection cell with the same base length.