The Effect Of Probe Frequency In Ultrasonic Testing

Nurul Hafidzah, Rosli (2009) The Effect Of Probe Frequency In Ultrasonic Testing. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

This research is conducted to investigate the effect of different probe frequency in Ultrasonic Testing. From the literature, the investigation about the probe frequency in Ultrasonic Testing has not been clearly investigated until now. Ultrasonic Testing is part of Nondestructive Testing and used widely to detect flaws and thickness of specimen without destroying the specimen. In the methodology chapter, the test sample is design using Catia V5R16 and fabricated using CNC Universal Milling Machine for 5-Axis. For the experiment work, dual crystal probe type is used, whereby the probe frequency that is manipulated during experiment are 2 MHz, 4 MHz and 5 MHz. The result for this experiment is the reflected sound energy from A-scanned. From the observation, it is shows that high frequency probe has low amplitude, low noise and sharp peak while low frequency probe shows high amplitude, high noise and wide peak. Through this result, the different characteristic for each level frequency that is high (5 MHz) and low (2 MHz) is discussed. The characteristic of high frequency is high attenuation, narrow beam and less penetration in contrast, low frequency has less attenuation, more penetration depth and flaw sensitivity. From this characteristic, it shows that high frequency probe suitable to detect small thickness, thin material and suitable in noisy environment, meanwhile low frequency probe is suitable for rough surface, grainy materials, small size and high depth defects.

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