| 摘要 |
PROBLEM TO BE SOLVED: To improve the accuracy of stress measurement in order to measure stress which is generated at a measurement object on the basis of data which are obtained by an infrared camera by removing unnecessary components from the data.SOLUTION: A processor 30 performs the processing of first time series data P1 which are obtained by an infrared camera 21, and indicate a temporal change of a temperature of a measurement object. The processor 30 creates second frequency data S2 by filter-processing first frequency data S1 which are obtained by applying Fourier-transformation processing to first time series data P1. The second time series data P2 obtained from the second frequency data S2 by inverse Fourier-transformation processing are converted to stress data indicating stress which is generated at the measurement object. In the filter processing, data of frequencies which correspond to a fundamental frequency F0 indicating a stress generation frequency generated at the measurement object which is obtained by a geometric calculation, and also correspond to high-order frequencies F1, F2 of the integral multiplication of the fundamental frequency F0 are derived from the first frequency data S1. |
