摘要
为了实现对样品溶液粘滞系数的精确、实时和无损测量,利用激光光镊中的光致旋转原理,提出了一种改进的理论和实验方法。首先对样品溶液的粘滞系数随探针粒子半径的变化关系进行了数值模拟,然后通过光镊实验装置测量并计算出具体的探针转动频率和液体粘滞系数值。结果表明,探针半径为2.0μm时得到的溶液粘滞系数误差最小,并且测量了不同温度下密封的纯净水和乙醇溶液的粘滞系数,实际偏差均小于7%,验证了本方法的有效性。该方法具有相当高的测量精度和无接触的特点,尤其是在测量粘滞系数较小、易挥发且有害性的溶液方面具有明显优势。
W EI Y ong（1. College of Science, Yanshan University, Qinhuangdao 066004, China; 2. College of Liren, Yanshan University, Qinhuangdao066004, China）Abstract ： In order to realize accurate, real-time and nondestructive measurement of viscosity coefficient of sample solution,an improved method was presented based on the light-induced rotation in laser optical tweezers. Firstly, the relationship betweenviscosity coefficient 77 of liquid and radius of probe particles was simulated numerically. And then, the values of rotationalfrequency and viscosity coefficient were measured through experimental optical tweezers. The results show that the error ofviscosity coefficient is minimum when the radius of probe is 2. 0μm. The viscosity coefficients of pure water and ethanol solutionare measured at different temperatures. Actual deviation is less than 1% , which proves the proposed method is effective. Themethod has the features of high accuracy and non-contact, and has obvious advantage for measurement of dilute, volatile andharmful liquid solution.
出处
《激光技术》
CAS
CSCD
北大核心
2016年第5期738-741,共4页
Laser Technology
基金
燕山大学里仁学院教学改革资助项目(lrjg201513)
燕山大学青年教师自主研究计划资助项目(15LGB022)
关键词
测量与计量
光致旋转
光镊
粘滞系数
measurement and metrology
optical rotation
optical tweezers
viscosity coefficient
