Ultrasonic method of measuring the thickness of the plating on a

Details Ultrasonic method of measuring the thickness of the plating on a Ultrasonic method of measuring the thickness of the plating on a

1989-03-09

1990-04-24

Williams, Hezron E.

Measuring and testing

Vibration

By mechanical waves

73637, G01N 2900

Patent

active

049189891

ABSTRACT:
According to the method of the invention concerning tubes, of which the plating to be checked is at least 0.4 mm thick and in which the acoustic impedance differs by at least 1% relative from that of the core of the tube, a properly dampened transducer is selected which has a frequency of 4 to 10 MHz. The position of the transducer in respect to the tube is adjusted experimentally, and its parameters of distance and orientation are differently adjusted in order to increase the "signal-to-noise" ratio. For determining the thickness of the plating, at least one double echo from the interface between the plating and the tube core is used, or alternatively, a triple echo from this interface. Also, there is a corresponding ultrasonic measuring apparatus as well as an application of the method to the ultrasonic measuring of the thickness of the plating of Zr alloy tubes. The tubes are plated with non-alloyed Zr or with some other Zr alloy.

REFERENCES:
patent: 4512194 (1985-04-01), Beuter
patent: 4625556 (1986-12-01), Sukahara et al.
patent: 4669310 (1987-01-01), Lester

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