MEASURING ARTICLE THICKNESS ULTRASONICALLY

摘要

In a system for measuring ultrasonically cable jacket thickness, an ultrasonic pulse is transmitted into engagement with the jacket as the cable is advanced through an upstream portion of a cooling trough adjacent an extruder. Signals developed as a result of a sequence of valid associated first and second echo pulses received from surfaces of the cable which define the jacket are processed. The system is provided with the capability of avoiding interference of the testing of a first echo pulse by a closely spaced second echo pulse which occurs in the measurement of thin-walled cable jackets.