Measuring and testing – Vibration – By mechanical waves
Patent
1997-08-13
1999-02-02
Brock, Michael
Measuring and testing
Vibration
By mechanical waves
G01N 2906, G01N 2910
Patent
active
058668195
ABSTRACT:
A non-destructive method and apparatus for determining the thickness of individual layers of different materials in a multilayer structure particularly useful in analyzing the layers in a multilayer plastic fuel tank, utilizes a constant and relatively high frequency ultrasonic pulse transmitted into the multilayer structure and records the time when interference pulses are received to determine the thickness of the individual layers in the multilayer structure. The interference pulses are generated at the interface between adjacent layers of sufficiently different materials and thus, the time between interference pulses is a function of the amount of time needed for the ultrasonic pulse to pass through a layer of material. The duration between reflected pulses is called the transmission time which is the time for the ultrasonic frequency to originally pass through the material and also the time for the reflected pulse to bounce back to the transducer and is thus equal to twice the time needed for the ultrasonic pulse to pass through the layer. Therefore, the thickness of a layer within a multilayer structure can be readily computed as one-half of the transmission time multiplied by the speed of sound through the material comprising that layer.
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Albu Dan
Taboun Salem M.
Brock Michael
Miller Rose M.
Walbro Corporation
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