| 摘要 |
1,021,213. Ultrasonic flaw detection. J. OBRAZ. Oct. 11, 1963 [Nov. 1, 1962], No. 40259/63. Heading H4D. In a pulsed ultrasonic flaw detection system utilizing swept gain technique the amplifier gain is controlled in accordance with an exponential function to compensate for variation of attenuation with depth of flaw and in accordance with a quadratic function to compensate for the divergence of the transducer beam with distance. The control functions are generated separately and applied to separate stages of the amplifier. |
