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在使用激光位移传感器测试冻土位移中,由于测试现场环境条件恶劣,厂家给出的传感器线性度会降低,因此,需要对所有传感器在使用前应模拟使用时的环境条件重新进行标定.为验证激光位移传感器在冻土测试中的适用性,依据德国森萨帕特FT-50 RLA220型激光位移传感器的结构、使用特点、技术指标,设计了由控温箱、标定支架、激光位移传感器、量块及数据采集装置组成的标定的装置,进行了不同负温条件下对激光位移传感器标定,并依据标定试验结果进行拟合参数修正,得到不同环境温度下的试验结果的线性度和迟滞特性.试验结果表明:不同的环境温度下,两个激光位移传感器与标准厂家测试曲线存在差异,不同负温条件下标定的两个激光位移传感器的拟合优度R2分别为0.999和1;线性度最大值分别为0.88%FS和0.32%FS.
In the test of displacement of permafrost using laser displacement sensor, the linearity of the sensor given by the manufacturer will be reduced due to poor environmental conditions at the test site, so all the sensors need to be re-calibrated before use to simulate the use of environmental conditions for verification The applicability of laser displacement sensor in permafrost test is based on the structure, characteristics and technical indexes of Sensace Patch FT-50 RLA220 Laser Displacement Sensor in Germany, and the design of the temperature control box, calibration stand, laser displacement sensor, Block and data acquisition device, the laser displacement sensor is calibrated under different negative temperature conditions and the fitting parameters are corrected according to the calibration test results to obtain the linearity and hysteresis characteristics of the test results under different ambient temperatures. The experimental results show that there are differences between the two laser displacement sensors and the standard factory test curves under different ambient temperatures. The goodness-of-fit R2 of the two laser displacement sensors calibrated under different negative temperatures are 0.999 and 1 respectively. The linearity is the largest The values were 0.88% FS and 0.32% FS, respectively.