应变传感器计量特性的校准方法

为了合理评价应变传感器（应变计）的计量特性,讨论了应变计的相关国家标准和技术规范中计量特性的不同之处,并以振弦式应变计为例,归纳出应变计的计量特性参数。对应变计校准现状进行分析,设计了一种基于激光干涉法的高精度校准装置,标距范围可以达到500mm,并提出了系列计量特性的高精度计算方法。通过试验对应变计的计量特性进行测试,并评估了综合误差的校准不确定度U=0.10%（包含因子k=2）。

Calibration Method of Strain Sensor Metrological Characteristics

In order to evaluate the metrological characteristics of strain sensor (strain gauge) reasonably, the differences of the metrological characteristics in the relevant national standards and technical specifications of the strain gauge were analyzed, and the vibrating wire strain gauge was taken as an example to sum up the metrological characteristic parameters of the strain gauge. The existing status quo of strain gauge calibration was studied, and a high precision calibration device based on laser interferometry was designed, whose gauge range could reach 500 mm. Then a set of high-precision calculation methods of metrological characteristics was proposed. The characteristics of the strain sensor were tested by experiments, and the uncertainty of the calibration of the integrated error U=0.10% (including factor k=2) was evaluated.