实现位移-电流转换的光学比较仪研究  

Research on displacement-current comparator

作　　者：李伟[1] 王耀军[1] 马加兴[1] 

机构地区：[1]浙江大学流体传动及控制国家重点实验室,浙江杭州310027

出　　处：《浙江大学学报（工学版）》2004年第7期860-863,共4页Journal of Zhejiang University：Engineering Science

基　　金：国家自然科学基金资助项目(50075081);国家"863"高技术研究发展计划资助项目(2001AA423320);浙江省自然科学基金资助项目(Z603248).

摘　　要：针对光学系统的非线性、光强漂移和大量程测量等问题,提出了一种基于偏振兴原理的位移传感器系统——位移-电流比较仪,实现了同光源双光路差动式比较仪方案.以光强、磁场为媒介,利用不同物理量引起的偏振兴旋转角之间的比较,实现了机械位移至电流的线性转换.组成了传感器试验测试系统,给出了静态和动态两种测试方案及其实验结果.传感器件具有非接触、线性度好、量程大、抗光源漂移等特点.实验验证了该传感器系统的可行性和有效性,其线性度优于0.1%.A displacement sensor system - displacement-current comparator was presented, which was based on the polarized light detection principle and made use of the Faraday magneto-optical effect. This displacement-current comparator makes a comparison between the two optical rotating angles associated with the displacement and the current, respectively. It measures the current instead of the displacement with an ideal linear scaling relation, and the former is a much simpler task comparing with the latter. The influence due to the light-intensity drift can be eliminated with a special optical device with one light source and two light paths. Furthermore, several problems such as nonlinearity correction and wide-range measurement are also solved with appropriate techniques. The linearity better than 0.1% can be obtained with this system, which contains mechanical, optical and electronic devices. The test results are in good agreement with the expectation from the measuring principle. The study indicates that the sensor system has advantages such as wide-range measurement, high accuracy and simple structure.

关 键 词：位移传感器 比较仪 偏振光 磁光效应 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]