Ultrasonic resonance for detecting changes in elastic properties

Details Ultrasonic resonance for detecting changes in elastic properties Ultrasonic resonance for detecting changes in elastic properties

1984-07-02

1986-06-24

Kreitman, Stephen A.

Measuring and testing

Vibration

Resonance, frequency, or amplitude study

73 86, G01N 2900

Patent

active

045961425

ABSTRACT:
Some forms of corrosion, and inter-granular attack in particular, occur without significantly altering the bulk dimensions of the body attacked. Where elastic properties are changed, this is detected by a sensitive ultrasonic inspection based upon the resonant frequency or frequencies with which the ultrasonic signals reverberate within the body. Resolution is improved by gating out the first, top, surface reflection and by swept gain control through the gating period.

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