Recognizing ultrasonic response signals during testing of structural materials

US4170143A · kind A · utility

Assignee

• Mannesmann AG · DE

Inventors

• Karl Ries · Mülheim, DE
• Dieter Kaiser · Dortmund, DE
• Mesa Quaye · Kaarst, DE
• Heinz-Jurgen Boms · Ratingen, DE
• Klaus-Uwe Jannsen · Ratingen, DE

Key dates

• Filing date: Aug 11, 1977
• Grant date: Oct 9, 1979
• Expiry date: Aug 11, 1997

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N2291/044
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

Ultrasonic response signals resulting from interaction of a test pulse with the structural material are recognized by dynamically tracking the noise level and adding thereto a fixed level; a response signal to be recognized must exceed the resulting variable threshold level.