Measurement device, measurement system, and measurement method

A measurement method comprising:

• a data acquisition step of acquiring first data, second data, and third data, the first data being data output from a first sensor provided on a structure and representing an impact due to one of an entry of a moving object to the structure and an exit of the moving object from the structure, the second data being data output from a second sensor provided on the structure and representing an impact due to the other of the entry of the moving object to the structure and the exit of the moving object from the structure, and the third data being data output from a third sensor provided on the structure and representing a bending of the structure due to the moving object;
• an abnormality determination step of determining whether or not each of the first sensor, the second sensor, and the third sensor is abnormal;
• a moving object detection step of detecting the moving object moving on the structure based on at least one of the first data and the second data;
• and
• a displacement amount calculation step of calculating a displacement amount of the structure based on the third data, wherein
• for an integer m equal to or larger than 1 and an integer n equal to or larger than 1, the structure includes first to m-th lanes and n main girders,
• for an integer k equal to or larger than 1 and equal to or smaller than n, the k first sensors are respectively provided on the k main girders of the structure, and
• for an integer i equal to or larger than 1 and equal to or smaller than m, in the abnormality determination step, when it is determined that one of the first sensor provided on the main girder closest to an i-th lane of the structure and the main girder second closest to the i-th lane is not abnormal among the k first sensors, in the moving object detection step, the moving object moving on the i-th lane is detected based on the first data output from the first sensor that is not abnormal.