Ultrasonic instrument with time and amplitude gate bar display

Details Ultrasonic instrument with time and amplitude gate bar display Ultrasonic instrument with time and amplitude gate bar display

1982-07-26

1984-02-21

Birmiel, Howard A.

Measuring and testing

Vibration

By mechanical waves

73606, 73610, 73614, 340715, 340722, 328115, G01N 2904

Patent

active

044322356

ABSTRACT:
An ultrasonic test instrument includes a pulse generator, a receiver, a cathode ray tube screen display and a time gate means providing a gated time interval for viewing only echo signals which arise from a predetermined workpiece region under test. The time gated interval is shown as a horizontal gate bar display on the screen and the length of the bar being indicative of the gated time interval. Circuitry provided generates a reference signal to cause the gate bar to appear at a height commensurate with the echo signal received in the gated intervals having the highest peak amplitude. Unless reset, the amplitude of the gate bar remains at this peak value although subsequent echo signals may have a lower amplitude.

REFERENCES:
patent: 3474438 (1969-10-01), Lauher
patent: 3924078 (1975-12-01), Bussey
patent: 4373394 (1983-02-01), Renzel et al.

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