| Popis: |
Based upon the correlation between interior flaw and parameters such as ultrasonic velocity, the first ultrasonic amplitude and the received ultrasonic frequency, a microcomputer testing system has been developed, which comprises of three elementary parts , namely, data sampling, signal processing and flaw judging. It can be applied in nondestructive testing of the internal flaws of the structure concrete. This paper concentrates on the introduction of the fast calculating algorithms of audiotime and the first ultrasonic amplitude , the spectral analyzing method of the received waveform and the two flaw judging procedures on the basis of fuzzy mathematical theory and production rule respectively. Finally , an example of detection is provided. All computing data and results of testing can be output in the form of graphic or literal through the CRT or printer. |
