一种位移电流比较仪探头优化设计

Optimization Design of the Probe of a Displacement-current Comparator

基于法拉第磁光效应和光的马吕斯定律,可将机械位移量线性地转换为电量,从而获得一种具有量程大、精度高、结构简单的位移电流比较式位移传感器。该类传感器检测探头的关键部件包括偏振片和旋光晶体(铽玻璃),其中旋光晶体占据了成本的主要部分。旋光晶体的设计不仅影响到系统性能,而且决定着整套传感器的成本。提出的旋光晶体优化方案,能够缩小探头尺寸,降低系统成本,应用到位移电流比较仪中取得了预期效果。

Based on the Faraday magneto-optical effect and the Malus law of light,the mechanical displacement can be converted linearly into electricity,thus obtained a displacement-current comparison sensor with large range,high precision and simple structure.The key components of the sensor included the polarizer and the rotary crystal(Terbium glass),the rotary crystal occupied the main cost.The design of the crystal can not only affect the performance of the system,but also can determin the cost of the whole system.An optimization scheme of the rotary crystal was proposed,which can reduce the size of the probe and lower the cost consequently.The expected effect was obtained by applying it to a displacement current comparator.