| 摘要 |
PROBLEM TO BE SOLVED: To efficiently detect an internal defect of a structure with a simple operation without requiring any skill by detecting the impact sounds and the repelling degree to the hammer when the same position of a structure to be measured is struck by a hammer several times. SOLUTION: When a measuring position and a measuring order are inputted by the keyboard operation of a personal computer 40, and a data measurement is instructed thereby, a measuring device 30 drives an impact device 10 and a sound collecting device 20, and the same position of a structure to be measured is struck by a counterweight a plurality of times (about 25 times) by the impact device 10. The signals of the rebound quantity (repelling degree- voltage) of the counterweight measured by the repelling degree measuring instrument of the impact device 10 and the impact sound (voltage) detected by the sound collecting device 20 are inputted to the measuring device 30, in which they are A/D converted and stored. The respective amplitude values of the impact sound and the repelling degree are compared with judgment reference values preliminarily stored in the measuring device 30, and those exceeding the reference values are outputted as judgment results to the display window of the personal computer 40. |
