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首页> 外文期刊>Journal of Heat Transfer >Fluorescence and Fiber-Optics Based Real-Time Thickness Sensor for Dynamic Liquid Films
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Fluorescence and Fiber-Optics Based Real-Time Thickness Sensor for Dynamic Liquid Films

机译：基于荧光和光纤的动态液膜实时厚度传感器

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摘要

To overcome the limitations/disadvantages of many known liquid film thickness sensing devices (viz. conductivity probes, reflectance based fiber-optics probes, capacitance probes, etc.), a new liquid film thickness sensor that utilizes fluorescence phenomena and fiber-optic technology has been developed and reported here. Measurements from this sensor are expected to facilitate better understanding of liquid film dynamics in various adiabatic, evaporating, and condensing film flows. The sensor accurately measures the instantaneous thickness of a dynamically changing liquid film in such a way that the probe does not perturb the flow dynamics in the proximity of the probe's tip. This is achieved by having the probe's exposed surface embedded flush with the surface over which the liquid film flows, and by making arrangements for processing the signals associated with the emission and collection of light (in distinctly different wavelength windows) at the probe's flush surface. Instantaneous film thickness in the range of 0.5-3.0 mm can accurately (with a resolution that is within ±0.09 mm over 0.5-1.5 mm range and within ±0.18 mm over 1.5-3.0 mm range) be measured by the sensor described in this paper. Although this paper only demonstrates the sensor's ability for dynamic film thickness measurements carried out for a doped liquid called FC-72 (per-fluorohexane or C_6F_(14) from 3M Corporation, Minneapolis, MN), the approach and development/calibration procedure described here can be extended, under similar circumstances, to some other liquid films and other thickness ranges as well.
机译：为了克服许多已知的液膜厚度感测设备（即电导率探头，基于反射率的光纤探头，电容探头等）的局限/缺点，一种利用荧光现象和光纤技术的新型液膜厚度传感器具有在这里开发和报告。期望通过该传感器进行的测量有助于更好地理解各种绝热，蒸发和冷凝膜流中的液膜动力学。传感器可精确测量动态变化的液膜的瞬时厚度，以使探针不会干扰探针尖端附近的流动动力学。这是通过使探头的裸露表面与液膜在其上流动的表面齐平嵌入的，并通过布置用于处理与在探头的齐平表面处的光的发射和收集（在明显不同的波长窗口中）相关的信号来实现的。通过本文所述的传感器可以准确地测量0.5-3.0 mm范围内的瞬时薄膜厚度（在0.5-1.5 mm范围内的分辨率在±0.09 mm之内，在1.5-3.0 mm范围内的分辨率在±0.18 mm之内） 。尽管本文仅展示了传感器对称为FC-72的掺杂液体（全氟己烷或来自明尼苏达州明尼阿波利斯的3M Corporation的C_6F_（14））进行动态膜厚测量的能力，但此处介绍的方法和开发/校准程序在类似情况下，可以扩展到某些其他液膜和其他厚度范围。

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