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首页> 外文期刊>Applied physics >Diode laser-based standoff absorption measurement of water film thickness in retro-reflection
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Diode laser-based standoff absorption measurement of water film thickness in retro-reflection

机译：基于二极管激光的对向反射中水膜厚度的支座吸收测量

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摘要

A dual-wavelength diode laser-based absorption sensor for standoff point measurements of water film thickness on an opaque surface is presented. The sensor consists of a diode laser source, a foil as backscattering target, and off-axis paraboloids for collecting the fraction of the laser radiation transmitted through the liquid layer via retro-reflection. Laser wavelengths in the near infrared at 1412 and 1353 nm are used where the temperature dependence of the liquid water absorption cross section is known. The lasers are fiber coupled and the detection of the retro-reflected light was accomplished through a multimode fiber and a single photodiode using time-division multiplexing. The water film thickness at a given temperature was determined from measured transmittance ratios at the two laser wavelengths. The sensor concept was first validated with measurement using a temperature-controlled calibration cell providing liquid layers of variable and known thickness between 100 and 1000 mu m. Subsequently, the sensor was demonstrated successfully during recording the time-varying thickness of evaporating water films at fixed temperatures. The film thickness was recorded as a function of time at three temperatures down to 50 mu m.
机译：提出了一种基于双波长二极管激光器的吸收传感器，用于对不透明表面上的水膜厚度进行距离测量。该传感器由二极管激光源，作为反向散射目标的箔片和离轴抛物面组成，这些抛物面用于收集通过回射反射通过液体层的激光辐射的一部分。在已知液态水吸收截面的温度依赖性的情况下，使用1412和1353 nm处的近红外激光波长。激光器是光纤耦合的，并且使用时分多路复用通过多模光纤和单个光电二极管来检测回射光。给定温度下的水膜厚度由两个激光波长下测得的透射比确定。传感器概念首先通过使用温度控制校准池进行测量验证，该校准池提供可变厚度和已知厚度在100至1000μm之间的液体层。随后，在记录固定温度下蒸发水膜的时变厚度的过程中成功演示了该传感器。在低至50μm的三个温度下记录膜厚度作为时间的函数。

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  • 来源
    《Applied physics》 |2016年第9期|249.1-249.7|共7页
  • 作者

    Pan R.; Brocksieper C.; Jeffries J. B.; Dreier T.; Schulz C.;

  • 作者单位

    Univ Duisburg Essen, Inst Combust & Gas Dynam React Fluids, Carl Benz Str 199, D-47057 Duisburg, Germany;

    Univ Duisburg Essen, Inst Combust & Gas Dynam React Fluids, Carl Benz Str 199, D-47057 Duisburg, Germany;

    Univ Duisburg Essen, Inst Combust & Gas Dynam React Fluids, Carl Benz Str 199, D-47057 Duisburg, Germany|Stanford Univ, High Temp Gasdynam Lab, Stanford, CA 94305 USA;

    Univ Duisburg Essen, Inst Combust & Gas Dynam React Fluids, Carl Benz Str 199, D-47057 Duisburg, Germany;

    Univ Duisburg Essen, Inst Combust & Gas Dynam React Fluids, Carl Benz Str 199, D-47057 Duisburg, Germany;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
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