| 摘要 |
In an ultrasonic measuring apparatus for emitting an ultrasonic pulse, receiving reflected echos and producing an echo signal representative of the echos resulting from each impulse, each echo signal has a first portion corresponding to echos from one group of interfaces and a second portion corresponding to echos from another group of interfaces. The apparatus comprises a gain control (24) for controlling the amplitude of each echo signal and a processor (26) for receiving and treating said echo signals. The processor treat a composite echo signal comprised of the first portion of a first echo signal combined with the second portion of a subsequent echo signal, the gain control setting the amplitude of both the first echo signal for the duration of the first echo signal and the amplitude of the subsequent echo signal at a second value for the duration of the subsequent echo signal, so as to optimize the amplitude of both the first portion of said first echo signal and the second portion of the subsequent echo signal in the composite echo signal when treated by processor.
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