Simultaneous measurement of liquid water film thickness and vapor temperature using near-infrared tunable diode laser spectroscopy

被引：39
|
作者：
Yang, H. [1 ]
Greszik, D. [1 ]
Dreier, T. [1 ]
Schulz, C. [1 ]
机构：
[1] Univ Duisburg Essen, IVG, D-47057 Duisburg, Germany
来源：
APPLIED PHYSICS B-LASERS AND OPTICS | 2010年 / 99卷 / 03期
关键词：
SENSOR;
D O I：
10.1007/s00340-010-3980-3
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
A fiber-based multiplexed tunable diode-laser absorption sensor with three near-infrared distributed-feedback diode lasers at similar to 1.4 mu m is used for simultaneous nonintrusive measurements of liquid water film thickness and vapor-phase temperature. Water film thicknesses are derived from broad-band absorption determined at two fixed wavelengths while gas-phase temperature above the film is obtained via two-line thermometry using the fast wavelength tuning with line-integrating absorption. Probing the liquid film at two wavelengths with significantly different liquid-phase absorption cross sections allows discriminating against additional signal losses due to surface fowling, reflection, and beam steering. The technique is demonstrated for liquid layers of defined thicknesses and in time-resolved measurements of evaporating films.
引用
收藏
页码：385 / 390
页数：6
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