摘要

露点温度是表征气体状态的一个重要参数, 针对低温环境的低露点温度精确、快速、连续、原位测量的迫切需要, 提出了可调谐二极管激光吸收光谱(TDLAS)技术对水汽露点温度测量的方案。首先与安徽省气象局的冷镜式露点仪一起对比测量标准温湿度箱内的露点温度, 验证波长为1 381 nm的TDLAS系统露点温度测量的可行性及精度, 然后结合一套开放式的测量装置, 进行低温度环境(最低温度100 K)水汽露点温度原位测量。得到了实时的露点温度值, 其中TDLAS露点测量结果与冷镜式露点仪测量结果一致性较好(相差小于1 K), TDLAS测量的时间分辨率为0.83 s, 远远快于冷镜式露点仪的时间响应速度。对于更低气体温度的露点测量, 获得了与气体温度变化趋势相同的露点温度, 同时得到了随着环境温度降低, 水汽逐渐趋向饱和的结论。

Abstract

The dew-point temperature is an important parameter of gas. Moreover, there is an urgent need for developing techniques that can facilitate the accurate, rapid, continuous, and direct measurement of low dew point temperatures. In this regard, an approach based on Tunable Diode Laser Absorption Spectroscopy (TDLAS) was developed. Firstly, our TDLAS hygrometer was compared with a chilled mirror hygrometer at Anhui Provincial Meteorological Bureau. Secondly, a free-path measurement apparatus was designed with an optical pathlength of approximately 3.8 m, and it was used to directly measure very low dew-point temperatures in a cryogenic chamber. Dew-point temperatures were obtained by standard formula. The results from TDLAS were compared with chilled mirror hygrometer.The maximum deviation is less than 1 K. In addition, the time resolution of the TDLAS system was determined to be approximately 0.83 s, which is shorter than the chilled mirror hygrometer.Through this experiment, we demonstrated that TDLAS technology was feasible to measure dew-point temperature at low temperatures.

补充资料

中图分类号：O433.1;O657.38

DOI：10.3788/ope.20182608.1862

所属栏目：激光光谱技术

基金项目：中国科学院科技创新基金资助项目(No.CXJJ-16M267);国家自然科学基金青年科学基金资助项目(No.11602292)

收稿日期：2018-04-09

修改稿日期：2018-06-13

网络出版日期：--

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联系人作者：聂伟(wnie@aiofm.ac.cn)

备注：聂 伟(1989-),男, 江西宜春人, 博士研究生, 2013年于内蒙古师范大学获得学士学位, 主要研究方向为激光光谱技术及其应用。

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引用该论文

NIE Wei,XU Zheng-yu,KAN Rui-feng,RUAN Jun,YAO Lu,WANG Bin,ZHANG Bu-qiang,HE Ya-bai. Measurement of low water vapor dew-point temperature based on tunable diode laser absorption spectroscopy[J]. Optics and Precision Engineering, 2018, 26(8): 1862-1869

聂 伟,许振宇,阚瑞峰,阮 俊,姚 路,王 斌,张步强,何亚柏. 可调谐二极管激光吸收光谱技术测量低温流场水汽露点温度[J]. 光学 精密工程, 2018, 26(8): 1862-1869

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