PZT和磁致伸缩孤立波传感器的性能研究与分析

It is confirmed that the solitary wave method can be used to measure Young's modulus of homogeneous and inhomogeneous materials, and the performance of solitary wave sensors to collect signals directly affects the accuracy of measurement results. Here, two types of solitary wave sensors based on different principles were introduced, and they were cylindrical sensors made of piezoelectric (PZT) materials and magnetostrictive sensors based on Villari and Faraday effect. Two types of sensors were used, respectively to measure concrete samples with the water-to-cement ratio of 0.42, 0.45 and 0.50. The average value of 100 measurements was compared with the standard reference one to compare the measurement accuracy of two types sensors. Standard deviations of two types sensors' measured values were analyzed, respectively to compare the repeatability of two types sensors. The test results showed that for the measured values of concrete samples with 3 water-to-cement ratios relative to the standard reference value, deviation rates with cylindrical pressure sensors are 6.48%, 5.04% and 1.85%, respectively, while those with magnetostrictive sensors are 0.78%, 3.08% and 4.94%, respectively; so error rates of both two types sensors are less than 10%, both of them can be used in the actual measurement; the accuracy of the latter is slightly higher than that of the former, and the standard deviation of the latter is lower than that of the former, so the latter has higher repeatability.