Patent ID: 11921012
Assignee: SEIKO EPSON CORPORATION
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 9:
10. A measurement method for causing a processor to execute a program stored in a memory, the measurement method comprising executing on the processor:
a target data generation step of acquiring target data, the target data corresponding to observation data sensed by an acceleration sensor, the acceleration sensor being disposed at a superstructure of a bridge, the observation data corresponding to displacement of the superstructure due to moving of a movable object on the superstructure, the target data including a drift noise of the acceleration sensor;
a high-pass filter processing step of performing high-pass filter processing on the target data to generate drift noise reduction data in which the drift noise is reduced;
an interval specifying step of calculating a first peak and a second peak of the drift noise reduction data, and specifying a first interval before the first peak, a second interval between the first peak and the second peak, and a third interval after the second peak;
a correction data estimation step of estimating, based on the drift noise reduction data, correction data in the second interval corresponding to a difference between the drift noise reduction data and data obtained by removing the drift noise from the target data;
a measurement data generation step of generating measurement data by setting data in the first interval as 0, adding the drift noise reduction data and the correction data in the second interval, and setting data in the third interval as 0; and
an abnormality determination step of determining an abnormality of the superstructure of the bridge based on the measurement data.