论文部分内容阅读
根据我们几年来进行静力触探的实践,感到探头若按目前的常规做法,温度补偿效果很差,直接影响了测试精度。为此,我们对探头中的关键部件——传感器,提出了一种新的设计方案。一、对常规探头温度补偿片粘贴位置的分析常用的探头是将测量片(R_1R_4)沿传感器轴向粘贴,温度补偿片(R_2R_3)沿传感器径向粘贴(见图1(a))。当传感器受拉后,R_1R_4,随之伸长,而R_2R_3则随之收缩。这样探头受温度影响后,电桥四臂电阻的变量△R_1 △R_2 △R_3△R_4又有了新的变化,电桥电压也随着变化,即探头产生温度应变,因而R_2R_3起不到温度补偿的作用。
According to our practice of static penetration testing for several years, if we feel that the current practice of the probe, the temperature compensation effect is very poor, directly affecting the test accuracy. For this reason, we have proposed a new design scheme for the sensor, the key component of the probe. First, the analysis of the conventional probe temperature compensation film paste the commonly used probe is to measure the film (R_1R_4) along the sensor paste, temperature compensation film (R_2R_3) along the sensor radial paste (see Figure 1 (a)). When the sensor is pulled, R_1R_4 stretches, and R_2R_3 shrinks. After the probe is affected by the temperature, the four-arm resistance of the bridge ΔR_1 ΔR_2 ΔR_3ΔR_4 has a new change, and the bridge voltage also changes, that is, the probe generates temperature strain, so R_2R_3 does not achieve temperature compensation The role.