A SIMPLIFIED DEVICE FOR SIMULTANEOUS FIELD SURVEY OF THE DRIFT SAND, FLOWING DIRECTION AND CURRENT SPEED. -Simultaneous Measurement of the Concentration of Drift Sand and Its Size Distribution-

为了同时测量流砂浓度及其粒径分布，我们研究了一种基于发光元件和敏感元件之间的光截止方法的传感器，用标准聚苯乙烯乳胶颗粒和海水，用光截止探测器ks-63，颗粒计数器KL-10和注射器采样器KZ-30 S。它们是由Lion公司制造的。获得如下结果：1）电流量：70-100 ml/min。材料的引入方向适合于水平位置。2)实用浓度：o-300 n/ml是可靠的。超过上述浓度，计数损失逐渐增加。3)半径分辨率：100 μ m固定时为15 μ m。初步实验和初步观察表明，该装置能同时测量流砂浓度和粒径分布，在一种廉价的流砂浓度现场测量仪上，设计了一种流砂浓度现场测量装置，并进行了试制。

For simultaneous measurements of the concentration of flowing drift sand and its size distribution, we studied a sensor based on the light cutoff method between a luminous element and a sensitive element.Using a standard polystilene latex particles 92mum radius and sea water, some fundamental working characteristics were examined with a device consisted of a light cutoff detector ks-63, a particle counter kl-10 and a syringe sampler kz-30s. They are made of Lion Ltd.Followings are obtained; 1) Current volume: 70-100 ml/min. Introducing direction of the materials is suitable in horizontal position. 2) Practicable concentration: o-300 n/ml is reliable. Over the above concentration, counting loss is gradually increased. 3) Radius resolution: 15mum in 100mum fixation. From the fundamental experiments and preliminary observations, the device was found to be useful for the simultaneous measurements of the concentration of flowing drift sand and its size distribution.On an inexpensive integral field survey meter for the concentration measurement of flowing drift sand, a device was work out a design and trial manufacture is going on.