New measurement possibilities of deformation anomalies and complete stress field distributions by portable digital-holographic gauge camera

Abstract Holographic interferometric deformation measurements have more than half century behind them. However, up to last decade they have been restricted mostly to laboratory measurements. The turning-point was the advent of three technical novelties: small solid state lasers, high resolution digital image sensors and fast enough computers. This started the long awaited transfer process from the closed laboratory rooms toward the real industrial environment. The Laser-FALCONEYE (L-FE) digital-holographic gauge camera is one of the forerunners in this transfer process which is still far from end. The dozen examples of applications to be outlined here intend to support this process further more. The examples can be divided in two main areas: deformation distribution measurements and stress distribution measurements based on stress-relief deformation measurement at diagnostic blind-hole drilling. The measured materials are mainly metals - but plastics, glasses, ceramics and rocks, too, have been measured with success.