| 摘要 |
A method is described for testing thin material wherein the material is irradiated with ultrasonic waves at least in certain areas and transmission of the ultrasonic waves through the material is determined and evaluated. The transmission of ultrasonic waves of different frequencies is thereby determined. The differences of the transmission at the different frequencies are then used to determine a criterion for evaluating the quality, in particular the porosity, of the irradiated material. Furthermore, a corresponding test device is described.
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