Measuring and testing – Vibration – By mechanical waves
Patent
1999-08-12
2000-09-26
Moller, Richard A.
Measuring and testing
Vibration
By mechanical waves
73 182, G01N 2900
Patent
active
061229687
ABSTRACT:
An ultrasonic probe includes an ultrasonic transducer; a delay line acoustically coupled to said transducer so that ultrasonic vibrations may be transmitted into said delay line from said ultrasonic transducer in a first direction, said delay line includes a first section and a second section; the first and second sections forming an interface that is substantially perpendicular to said first direction; and the second section including a surface for coupling with a material to be investigated. The probe can be used to measure a thickness of a coating on a substrate by transmitting a signal in a first direction from the transducer into the delay line; measuring a time t.sub.1 for a first portion of the signal to travel round trip from the transducer and the interface; using the measured time t.sub.1 to calculate an expected time t.sub.2 for a second portion of the signal to travel round trip from the transducer to an opposite face of the delay line; measuring a time t.sub.3 that it takes for a third portion of the signal to travel round trip from the transducer and an interface between the coating and the substrate; and calculating a thickness of the coating based on a difference between the time t.sub.2 and the time t.sub.3.
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DeFelsko Corporation
Moller Richard A.
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