膏药测量中双传感器补偿法失效现象的研究

介绍了膏药激光透射法测量系统及双传感器补偿法的测量原理。在测量系统中，为消除光源强度变化对测量精度的影响，采用分光镜将光源分为测量光和参考光，同时采用两个光电传感器接收信号并进行补偿。在实验中，这种双传感器补偿法并未达到预期效果。分析原因之后，指出光源偏振方向的随机变化，导致系统中分光镜分光比的随机变化，若保证光源偏振方向不变，分光比也不会因光源强度变化而变化，从而可达到补偿效果。为此，给出了解决方案及实验结果。结果表明：该解决方案是可行的，实验结果可以满足系统精度要求。

Research on Compensation Invalidation in Plaster Measurement with Double-sensors

Plaster measurement system with laser transmission method and principle of double-sensors compensation were introduced.In measurement system,a beam splitter was adjusted to divide light source into measurement beam and reference beam,while two optic-electric sensors were used to receive and compensate signals,so that accuracy influence caused by intensity changing of light source can be avoided.The experiment results are not well,the method of double-sensors has not achieved its aim.The phenomenon was analyzed.The problem was pointed out that random changing of polarization direction of light source results in random changing of splitter ratio of the beam splitter.If the polarization direction was not changed,the splitter ratio will not be changed either even the intensity of light source was changed.Then the compensation effect will be achieved.Based on this analysis,a method was proposed and experiment results were given.The experiment results show that the proposed method is feasible and the compensated results can meet the accuracy requirement of the system well.