Measuring and testing – Vibration – By mechanical waves
Patent
1982-01-11
1984-09-25
Ciarlante, Anthony V.
Measuring and testing
Vibration
By mechanical waves
73642, 73622, G01N 2904
Patent
active
044729758
ABSTRACT:
In the ultrasonic inspection of test pieces, particularly tubular materials, a device for coupling a transducer to the surface of the test material, by a liquid medium, incorporates desirable features of both "contact" and "immersion" transducers. Disclosed is a coupler the housing of which has a cavity having a water supply inlet and an air exhaust vent. Water flow into the cavity if so controlled as to initially purge air from the cavity to fill it with water, after which the water flow is at a carefully controlled rate effective to keep the cavity filled while supplying fresh water only to the extent necessary to make up for water leaking out through a narrow gap defined between the test piece and the face plate of the disclosed coupler. The water within the cavity provides a liquid couplant between the test piece and a transducer carried by a holder mounted in the cavity for precision adjustment. The transducer is in itself adjustable in respect to the holder in each position to which the holder is adjusted. In this way, precision focussing of an ultrasonic beam is attained. Precise control of the incidence and refraction angles of the propagated ultrasonic waves is thereby achieved accompanied by a desirable concentration of the ultrasonic energy in a specific target region of the test piece.
REFERENCES:
patent: 2956185 (1960-10-01), Von Stocker
patent: 3269173 (1966-08-01), Ardenne
patent: 3420097 (1969-01-01), Battermann
patent: 3908446 (1975-09-01), Mruk
patent: 3938372 (1976-02-01), Sproule
KB-Aerotech-Variable Angle Water Column Fixture.
Automation Industries Inc.-Water Coupler & Accessories, 4/69.
Beck Kenneth H.
Coates Darrell W.
Ciarlante Anthony V.
Kane John J.
Tac Technical Instrument Corporation
Zoda Frederick A.
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