一种RZB分量式钻孔应变仪原地线性标定技术及试验

摘要

Due to long working life,aging of components,creep of material,and other factors,it is necessary to carry out in-situ static physical calibration periodically to understand borehole strain meterperformance.At present,the static physical calibration method with piezoelectric ceramics has many disadvantages,including hysteresis,creep and linearity,so the accuracy of calibration is poor with large errors.To make the in-situ linear calibration of the RZB-type borehole strain meter,a linear calibration mechanism was designed.Based on a ceramic motor as the core,a grating sensor as the feedback and the RS485 bus,the mechanism can remotely realize the in-situ linear calibration to master instrument function.Some simulation experiments for in-situ linear calibration are performed in the laboratory,and the calibration data of the full-scale sensor show that:the calibration resolution is better than 2 μm and the linearity is better than 1％.%由于运雏时间长,RZB钻孔应变仪存在元器件老化、材质蠕变等问题,使传感器性能不断发生变化,需要定期对其进行原地静态物理标定.目前采用的以压电陶瓷为核心的静态物理标定方式存在迟滞、蠕变、非线性等缺陷,使标定结果精度差、误差大.本文设计了以陶瓷马达为核心、光栅传感器作为反馈、RS485总线为基础的远程线性标定机构,实现了RZB钻孔应变仪原地线性标定功能.在实验室开展原地线性标定模拟试验,传感器满量程的标定数据结果表明,标定分辨率达到2 μm,线性度优于1％.