Patent · US Expired

Material testing apparatus using ultrasonic testing heads

US4489611A · kind A · utility

3Cited by

5References

5Claims

0Family size

Assignee

Messerschmitt-Boelkow-Blohm Gesellschaft mit beschraenkter Haftung · DE

Inventors

Werner Zimmermann · Putzbrunn, DE
Helmar Langer · Munich, DE

Key dates

Filing date	Jan 20, 1983
Grant date	Dec 25, 1984
Priority date	—
Expiry date	Jan 20, 2003

Classification

Technology area (CPC G)Physics
CPC primaryG01N2291/105
WIPO fieldMeasurement
WIPO sectorInstruments

Abstract

Materials and structural components having irregular shapes may be tested two ultrasonic testing heads which are movable in unison in the direction in which the cross-section of the material or component being tested changes. The synchroneously moving testing heads are spaced from each other in a direction extending across the moving direction. The testing heads are ultrasonic receivers connected with their outputs to a comparing device which provides an error signal when the amplitude ratio of the received signal changes. The amplitude ratio is formed between the amplitudes of the ultrasonic signals received by both testing heads. Preferably, the comparing device comprises an amplifier which amplifies the amplitude of the received second signal by an amplification factor which is proportional to a deviation of the amplitude of the received first signal from a reference value. The error signal is recorded, for example, by a coordinate plotter.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.