权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Developmental Research of Multi-Fiber Optic Liquid Film Sensor

多光纤液膜传感器的发展研究

基本信息

批准号：
60850035
负责人：
OHBA Kenkichi
金额：
$ 3.07万
依托单位：
Kansai University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Developmental Scientific Research
财政年份：
1985
资助国家：
日本
起止时间：
1985 至 1986
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-60850035/
关键词：
Liquid Film Sensor Fiber Optic Sensor Gas-Liquid Two-Phase Annular Flow Local and Instantaneous Value of Film Thickness 液膜波形の同定と推定多ファイバヘッドフレオン液膜流

项目摘要

Two kinds of fiber optic liquid film sensors have been newly developed, both of which are more versatile and more reliable than the conventional electric conductance and electric capacitance probes. A pickup (sensor head) of the first sensor, which we call a seven-fiber sensor, consists of seven fibers tightly joined each other in parallel, i.e. a centered fiber serving as a transmitting fiber and six receiving fibers surrounding it. A pickup of the second sensor, which we call a mono-fiber sensor, consists of only one fiber playing both roles of transmitting light and of receiving the reflected light from a film surface. Both these fiber optic sensors can be applied to almost all the fluid film flow except an opaque one.The characteristics of a static calibration and a dynamic response of these sensors to liquid film wave have been investigated by computer simulations based on the authors' measurement theory and by simulation experiments. After that, these sensors have been applied to actual air-water and air-Freon R113 two-phase annular flows in a vertical tube, and the local and instantaneous value of the film thickness has been measured using these sensors. The following facts have been as a result clarified. The mono-fiber sensor can measure the film thickness ranging from 0mm to about 2 mm and it can distinguish the crest and the trough from other parts in the wave-form of the liquid film and can measure the film thickness at these parts because the output signal is obtained from the mono-fiber sensor only at the crest and the trough. The mono-fiber sensor can therefore determine the overall wave-form of the liquid film. On the other hand, the seven-fiber sensor can measure the film thickness ranging about from 1 mm to 10 mm. It can also distinguish the crest and the trough in the wave-form of the liquid film and can measure the local and instantaneous value of the curvature as well as the film thickness at these parts.

研制了两种新型的光纤液膜传感器，这两种传感器比传统的电导式和电容式探头具有更高的可靠性和通用性。一辆皮卡第一传感器的拾取器（传感器头），我们称之为七光纤传感器，由七根彼此平行紧密连接的光纤组成，即中心光纤用作发射光纤，六根接收光纤围绕它。第二传感器的拾取器，我们称之为单光纤传感器，仅由一根光纤组成，该光纤同时起到传输光和接收来自膜表面的反射光的作用。这两种光纤传感器可以应用于除不透明液膜外的几乎所有液膜流，本文根据作者的测量理论，通过计算机模拟和模拟实验，研究了这两种传感器的静态标定特性和对液膜波的动态响应特性。然后将这些传感器应用于实际的垂直管内空气-水和空气-氟里昂R113两相环状流中，测量了局部和瞬时的膜厚值。因此，澄清了以下事实。单光纤传感器可以测量从0 mm到大约2 mm范围内的膜厚度，并且它可以将液膜波形中的波峰和波谷与其它部分区分开，并且可以测量这些部分处的膜厚度，因为仅在波峰和波谷处从单光纤传感器获得输出信号。因此，单光纤传感器可以确定液膜的总体波形。另一方面，七光纤传感器可以测量约从1 mm到10 mm的膜厚度范围，它还可以区分波峰和波谷的液体膜的波形，并可以测量局部和瞬时值的曲率以及在这些部分的膜厚度。