Abstract: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%.
WU Liheng,XIONG Yuzhen,LI Tao et al. In-Situ Linear Calibration Technique of the RZB-Type Borehole Strain Meter:Including a Laboratory Experiment[J]. jgg, 2018, 38(4): 437-440.