Method and device for measuring objects using ultrasound echogra

Details Method and device for measuring objects using ultrasound echogra Method and device for measuring objects using ultrasound echogra

1983-05-09

1984-05-08

Goldberg, Gerald

Measuring and testing

Vibration

By mechanical waves

73631, 123660, G01N 2900

Patent

active

044467370

ABSTRACT:
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 tramsmitted 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 transducer 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 F.sub.c, a logarithmic amplifier (250) and a divider circuit (260) which divides the output of the logarithmic amplifier by a factor proportional to the frequency F.sub.c and whose output signal is applied to a second channel of the display device of the processing circuit (100).

REFERENCES:
patent: 3307408 (1964-04-01), Thomas
patent: 3662589 (1972-05-01), Adler
patent: 4016750 (1977-04-01), Green
patent: 4102205 (1978-07-01), Pies

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