Sensor Performance Analysis by Equal Strength Beam Test for Crane SHM

The purpose of this article is to select the most appropriate sensor for the crane structural health monitoring. We used three kinds of sensors to do an equal strength beam test: The original sensor R2 and R4 which have been calibrated, American MOI FBG sensor and wireless strain sensor. After derived the formula of maximum normal strain, we have done equal strength beam test for 3 times. Then calculated their average and contrasted their linearity to see the accuracy of MOI FBG os3110 and wireless sensor. Compared with the experimental value theoretical value, the wireless sensor has the highest accuracy, it is even more accuracy than the original sensor R2 and R4 which have been calibrated; Departure from linearity aspect, the wireless sensor, the original sensor R2 and R4,all of them have small relative error rate, it is less than 10%, but MOI FBG os3110 has very large relative error rate; In order to compare the overall performance of the sensor, we can also compare the sensors from the sensitivity aspect, zero drift, detection range, and so on.