Ultrasonic testing of turbine disks requires detection of small defects. One needs to use higher frequencies to be able to detect these very small defects. But many of the materials that sound travels through also could attenuate the high frequency components of the signal, making it difficult to find small flaws. The presentation indroduced a study wich developed a procedure to measure the attenuation versus frequency for a given material. The principle developed for attenuation determination has successfully obtained the attenuation for frequency range used in the calibration standard. These results shows the reason for loss of high frequency parts in the waveforms. Also, the results show that by modifying the material used in the calibration test, one could obtain a improved signal with higher frequency. |
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