Holographic arrangement for testing materials without destroying same

US3976380A · kind A · utility

Assignee

• Opto Produkte AG · CH

Inventors

• Hans Rottenkolber · Wasserburg am Inn, DE
• Hans Steinbichler · Neubeuern, DE

Key dates

• Filing date: Mar 11, 1974
• Grant date: Aug 24, 1976
• Expiry date: Mar 11, 1994

Classification

• Technology area (CPC G): Physics
• CPC primary: G01B9/021
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A method and apparatus for nondestructive testing of articles by holography in which light beams from a virtual point source of laser light and from an observation point are reflected by a reflector toward the same point on the object being checked. The light beams when extended beyond the reflector intersect on an ellipsoid having the point source and the observation point as foci. A plate having a hologram of the article is interposed between the observation point and the reflector and flaws in the object being tested show up on the plate as interference lines when the object is modified in shape by a mass influence such as a temperature change, or a change in pressure thereon, or by vibrations.