基于超声液体光栅的透明溶液浓度测量

Research of Transparent Solution Concentration Measurement based on Ultrasonic Liquid Grating

超声液体光栅是一种特殊的可变形光栅,它利用超声波在液体中以弹性纵波形式传播时所产生的驻波效应,形成了等效的液体光栅,利用光栅的衍射效应可以测量溶液浓度。对氯化钠、无水葡萄糖和丙三醇三种透明溶液超声液体光栅产生的衍射效应进行分析,得到了其与液体中超声波传播速度的关系,进而得知其“浓度-声速”关系呈现为线性相关,并利用此关系对未知溶液浓度进行了测量,实验测量值与实际值符合较好。

Ultrasonic liquid grating is a special kind of deformable grating,which takes advantage of the standing wave effect generated when ultrasonic waves propagate in liquid in the form of elastic longitudinal waves to form an equivalent liquid grating.At the same time,we used this reaction to measured the concentration of solutions.We analyzed the diffraction reaction of ultrasonic liquid grating for three transparent solutions of sodium chloride,anhydrous glucose and propanetriol.We found the different speed of different liquids in ultrasonic wave.Based on this result,we found the regularity of"concentration-velocity of sound"is linear,and used this regularity to measure the concentration of unknown solutions,and the experimental measured value is in good agreement with the actual value.