Ultrasonic measuring instrument

Details Ultrasonic measuring instrument Ultrasonic measuring instrument

1979-08-08

1982-06-15

Ruehl, Charles A.

Measuring and testing

Vibration

By mechanical waves

7386127, G01F 166, G01N 2902

Patent

active

043344313

ABSTRACT:
By detecting the instant of a selected zero-crossing of a received ultrasonic signal rather than relying on the instant the amplitude of that received signal exceeds a predetermined reference amplitude in excess of zero, a transit-time measuring instrument can be realized which is free from the measurement errors normally arising from acoustic signal attenuation in the medium through which it passes.

REFERENCES:
patent: 3697936 (1972-10-01), Zacharias, Jr. et al.
patent: 3818757 (1974-06-01), Brown
patent: 4028938 (1977-06-01), Eck
patent: 4095457 (1978-06-01), Koda et al.
patent: 4183244 (1980-01-01), Kohno et al.

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