Ultrasonic thickness gauge for multilayer plastic fuel tanks

Details Ultrasonic thickness gauge for multilayer plastic fuel tanks Ultrasonic thickness gauge for multilayer plastic fuel tanks

1996-05-06

1997-03-04

Oda, Christine K.

Measuring and testing

Vibration

By mechanical waves

73627, G01N 2920

Patent

active

056081650

ABSTRACT:
The thickness of a vapor barrier layer embedded in a co-extruded plastic fuel tank is measured using ultrasound. An interference method using ultrasonic tone-bursts employs a frequency progression wherein a frequency producing a minimum in the reflection echo from the barrier layer identifies the thickness of the barrier layer. The method is useful in polyethylene fuel tanks wherein an ultrasonic attenuation which is highly dependent upon frequency limits the resolution of barrier layer thickness.

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