G - Physics – 01 – S
Patent
G - Physics
01
S
349/36
G01S 7/52 (2006.01) A61B 8/00 (2006.01) G01S 7/62 (2006.01)
Patent
CA 1221161
11 ABSTRACT: "Device for the scanning of objects by means of ultra- sound echography." A device for the scanning of objects by means of ultrasound echography comprises a first ultrasonic transducer (10) which is connected to a transmitter stage (50) for the repeated transmission of ultrasonic signals and to a receiver stage (100, 200) for receiving the ultrasonic echoes which correspond to the most important obstacles encountered by the transmitted signals in their propagation direction, said receiver stage comprising a first, known processing circuit (100) and, connected parallel thereto, a second processing circuit (200) which consists of a series connection of a control circuit (210) for the automatic control of the gain as a function of the distance of the echoes, a correction circuit (220) for the correction of diffraction effects, a selection circuit (230) for the selection of a narrow frequency band within the pass-band of the transducer which is centered around a frequency Fc, a logarithmic amplifier (250) and an Fc-divider (260) whose output signal is applied to a second channel of the display device of the processing circuit (100).
438540
N.v.philips'gloeilampenfabrieken
Van Steinburg C.e.
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