Patent ID: 11867592
Assignee: NEC CORPORATION
Field: Measurement (Instruments)
Classification: CPC G  E | IPC G

Claim 0:
1. A structure displacement amount measurement apparatus comprising:
a memory containing program instructions; and
a processor coupled to the memory, wherein the processor is configured to execute the program instructions to:
measure, at each of a plurality of times over a period of time, a displacement amount generated on a measurement spot on a floor deck of a target bridge by structure due to a weight of a vehicle traveling on the target bridge, which is to be diagnosed, wherein the displacement amount is measured by analyzing time-series images of the measurement spot captured by a camera substantially immediately below the measurement spot;
estimate, within the period of time, a section of time in which deflection of the target bridge occurred, based on the displacement amount measured at each of the plurality of times over the period of time;
detect a number of maximal values and a number of minimal values of change in displacement amount the displacement amount measured within the section of time;
in response to the number of maximal values being equal to one and the number of minimal values being equal to zero, correspond the maximal value as the displacement caused by the weight of only the vehicle; and
generate a histogram of the displacement amount caused by the weight of only the vehicle; and
perform deterioration diagnosis of the target bridge based on the generated histogram, and output a result of the deterioration diagnosis.