Ultrasonic liquid-in-line detector for tubes

Details Ultrasonic liquid-in-line detector for tubes Ultrasonic liquid-in-line detector for tubes

1989-03-06

1991-05-07

Tarcza, Thomas H.

Measuring and testing

Vibration

By mechanical waves

73599, G01H 312

Patent

active

H00009121

ABSTRACT:
An apparatus and method for detecting the presence of liquid in pipes or tubes using ultrasonic techniques A first piezoelectric crystal is coupled to the outside of the pipe or tube at the location where liquid in the tube is to be detected. A second piezoelectric crystal is coupled to the outside of the pipe or tube at the same location along the tube but circumferentially displaced from the first crystal by an angle around the pipe or tube of less than 180.degree.. Liquid in the pipe or tube is detected by measuring the attenuation of an ultrasonic signal sent by the first piezoelectric crystal and received by the second piezoelectric crystal.

REFERENCES:
patent: 3744301 (1973-07-01), Arave
patent: 4361041 (1982-11-01), Piper
patent: 4580444 (1986-04-01), Abts et al.
patent: 4679430 (1987-07-01), Scott-Kestin et al.
patent: 4685334 (1987-08-01), Latimer
patent: 4730493 (1988-03-01), Labaud et al.

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