Investigation of Techniques for Measuring Spatial Distributions of Particles in Each Shape and/or Size and for Visualizing Velocity of Flow Instantaneously and Quantitatively

由于目前对各种形状和/或尺寸的颗粒分布进行瞬时测量的发展研究现状，国际上还没有开发出有效的测量技术，只有相位多普勒风速仪这样的技术在几百μm矩形的小视场内测量颗粒的尺寸。然而，该技术不能用于测量颗粒的形状。同时，已经阐明，我们已经开发的多路复用匹配空间滤波（MMSF）方法可以在直径大于40 mm的大视场中测量具有多种形状和/或尺寸的颗粒的空间分布和行为。为了方便制作MMSF，我们发展并建立了一种用光导塑料板自动、快速、简便地制作全息图的技术（PPH技术）。因此，它便于使用MMSF方法和测量分布， ...更多信息 每种形状和/或尺寸的颗粒的行为。另一方面，在流速测量方面，阐明了新技术发展的研究趋势，即PIV技术主要用于二维测量，而很少用于三维测量，尽管有人试图将PIV技术应用于三维测量。在本调查中，已澄清以下内容。HPIV方法（全息法）可以测量流体中粒子的三维位置和速度分布，但目前存在的不足是对光传播方向的距离分辨效率较低。在PTV方法中，采用光导塑料全息（PPH）自动全息技术，可以很容易地分辨出流场中密集颗粒的颗粒轨迹重叠图像。利用激光束平行扫描系统和ICCD摄像机观察颗粒散射光，发展了一种测量亚微米颗粒空间分布的新技术。少

As the existing state of developmental researches for instantaneously measuring distributions of particles in each shape and/or size, non techniques for effective measurement was developed in the world, without only one of the poor technique as Phase Doppler Anemometer for measuring size of particle in the small view field like as several hundred μm rectangular. Nevertheless, the technique could not use to measure shapes of particles. While, it has been clarified that the Multiplexed Matched Spatial Filtering (MMSF) method which had been developed by us could measure the spatial distributions and behavior of particles with plural shapes and/or sizes of particles in the large view field as larger than 40 mm in diameter. In order to make MMSF easily, the technique for making hologram automatically, rapidly and simply (PPH technique), has been developed and established using Photo-conductor Plastic plate. Therefore, it makes easy to utilize MMSF method and to measure the distributions and … More behavior of particles in each shape and/or size. On the other hand, for measuring velocity of flow, it is clarified that the tendency of the study concerning development of new techniques shows that PIV method is mainly used to measure in the two dimensional measurement, and is hardly used in the three dimensional measurement, although, the PIV technique is attempted to apply for three dimensional measurement. In this investigation, followings have been clarified. HPIV method (holographic method) which can measure the three dimensional distribution of positions and velocities of particles in flow has a deficiency that the efficiency in resolution of distance for direction of optical propagation is small at present. In the PTV method, the overlapped images of loci of particles taken photograph for the dense particles in flowing field can be discriminated easily by using the technique for making hologram automatically with Photo-conductor Plastic Hologram (PPH) method. A new technique for measuring spatial distribution of submicron particles has been developed by using the system for scanning laser beam parallel and observing the scattered light from particles by ICCD camera. Less