Method and apparatus for monitoring the operation of ultrasonic testing of tubes and bars

US4065960A · kind A · utility

Assignees

• Krautkramer GmbH & Co. · DE
• Mannesmann AG · DE

Inventors

• Werner Grabendorfer
• Herbert Vogt · Munich, DE
• Harri Haacke · Ratingen, DE
• Harry A. Kuhn · Phoenix, US
• Reinhard Pawelletz · Düsseldorf, DE
• Karl Ries · Mülheim, DE

Key dates

• Filing date: Dec 13, 1976
• Grant date: Jan 3, 1978
• Expiry date: Dec 13, 1996

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N2291/2634
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

This invention relates to immersion ultrasonic pulse-echo testing of tubes or bars for internal defects wherein means are provided to continuously monitor the operation of the test channel. As ultrasonic energy enters the workpiece, the round workpiece surface causes acoustic energy scatter responsive echo signals which are sensed by the transmitter probe, are amplified and applied to a threshold circuit. If the amplitude of the scatter responsive signal falls below a predetermined level, an output signal indicative of "loss of operation" is produced. Means are provided to inhibit such output signal in the event of only a momentary decrease of the scatter responsive signal below a predetermined value.