| 摘要 |
An ultra-sonic echography apparatus comprises a probe with multiple elements switched at the rate of transmission pulses and moved along a contour of the test body. Its position is registered by a pantograph cooperating with three sine-cosine potentiometers, the sine potentials of which control the horizontal deflection plates of a cathode-ray tube, while the cosine potentials control the vertical deflection plates and a fourth potentiometer adds potentials displaced by 90 DEG with respect to those delivered by the said three potentiometers, so as to control the beam position of the cathode ray tube for obtaining, on the screen thereof, a beam trace which is homothetic with respect to the ultrasonic beam in the test body.
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