中国激光, 2014, 41 (12): 1208010, 网络出版: 2014-11-25   

基于TDLAS技术在线测量气流道内液膜动态厚度

Liquid-Water Film-Thickness Online Measurement in a Flow Channel by TDLAS
作者单位
1 上海理工大学能源与动力工程学院, 上海 200093
2 上海市动力工程多相流动与传热重点实验室, 上海 200093
摘要
在液膜厚度测量时,通过选取液态水吸收截面不同的两个波长可消除除液态水吸收以外的其他信号衰减所造成的影响,如轻微的光束转向现象。但该方法仍较难消除在液膜蒸发过程后期由于液膜收缩所造成剧烈的光束转向现象的影响。基于双波长可调谐半导体激光吸收光谱(TDLAS)技术测量透明石英玻璃板上液膜蒸发过程中膜厚的变化,并同时用图像法追踪液膜形状的变化,对剧烈的光束转向现象进行研究。在此基础上,通过在光电探测器前放置积分球,对已有的TDLAS液膜测量系统进行优化,以消除剧烈光束转向现象对膜厚测量的影响,并利用该系统分别测量了气流道内液膜形成过程和蒸发过程中液膜的厚度变化。
Abstract
Probing the liquid film at two wavelengths with different absorption cross-sections allows eliminating the effect of additional broadband signal losses, e.g., minor beam steering. However, severe beam steering effects due to the shrinking of the liquid film at the end of the evaporation process can not be avoided. The effect is studied by measuring the film thickness on quartz plate during film evaporation process with two-color tunable diode laser absorption spectroscopy (TDLAS) method, and shadowgraphy images are simultaneously taken to track the change of film shape. Severe beam-steering effects are reduced in the developed two-line TDLAS film-measurement sensor by using an integrating sphere in front of the detector. The sensor is then applied to obtain the film thickness variation in the flow channel during the film build-up by impinging of water droplets and the evaporation of liquid film.

杨荟楠, 郭晓龙, 苏明旭, 蔡小舒. 基于TDLAS技术在线测量气流道内液膜动态厚度[J]. 中国激光, 2014, 41(12): 1208010. Yang Huinan, Guo Xiaolong, Su Mingxu, Cai Xiaoshu. Liquid-Water Film-Thickness Online Measurement in a Flow Channel by TDLAS[J]. Chinese Journal of Lasers, 2014, 41(12): 1208010.

本文已被 7 篇论文引用
被引统计数据来源于中国光学期刊网
引用该论文: TXT   |   EndNote

相关论文

加载中...

关于本站 Cookie 的使用提示

中国光学期刊网使用基于 cookie 的技术来更好地为您提供各项服务,点击此处了解我们的隐私策略。 如您需继续使用本网站,请您授权我们使用本地 cookie 来保存部分信息。
全站搜索
您最值得信赖的光电行业旗舰网络服务平台!