Patent ID: 8225668
Filing Date: 2012-07-24
Classification: G01N

Abstract:
1. An ultrasonic wave testing method comprising: preparing a ultrasonic testing device that transfers ultrasonic wave from an ultrasonic testing device to a test piece via a gas, the test piece transfers a propagating wave, the test piece is varied in a thickness of the test piece itself or a material or the thickness and the material, the ultrasonic testing device comprises: a probe assembly comprising a scan head: the scan head comprises a transmitter and a receiver that is disposed apart from the transmitter; the transmitter is a first focal point probe that focuses the ultrasonic wave at a plurality of different incident angles on a focal point via a gas, the focal point is on the test piece, the receiver is a second focal point probe that receives the ultrasonic wave propagated through the test piece via a gas at a plurality of different receivable angles; the method comprising the steps of: transmitting the ultrasonic wave from the transmitter at the different incident angles to the focal point on a normal region of the test piece via the gas; selecting a first incident angle of the incident angles from the different incident angles based on a product of a frequency of the ultrasonic wave and a thickness of the normal region according to a first material of the normal region first test area; generating a first propagating wave of a specific mode on the test piece based on a first ultrasonic wave that is transmitted from the transmitter at the first incident angle; propagating the first propagating wave through the test piece; selecting a first output angle of output angles from the different receivable angles based on a product of a frequency of the ultrasonic wave and a thickness of an output region of the test piece according to a material of the output region; receiving a released ultrasonic wave that is released from the output region at the first output angle by the receiver via the gas; generating a first signal based on the released and received ultrasonic wave; and detecting a defect in a propagating path of the first propagating wave based on the first signal.