| 摘要 |
<p>A method of and a device for ultrasonic examination of an object by means of a row of N electroacoustic transducers. Each time a group of M transducers (M>/=N) thereof is selected by means of a switching member. These M transducers are first included in transmission networks, transmission signals then being applied to the converters; subsequently, they are included in receive networks, receive signals then being applied to a display device. The transmission and/or receive signals are multiplied by weighting factors between 0 and 1. The sum of the weighting factors during transmission may deviate from that during reception. During transmission and/or reception, at least two different combinations of weighting factors are used, the sum thereof being each time the same. The scanning line density can thus be substantially increased.</p> |
