Some problems relative to the use of three lasers beams of different colours and colour image detectors for real-time electronic speckle interferometry (ESPI) are discussed. A simple ESPI setup is proposed, allowing non-contact real time mapping of displacements and strain of a surface, simultaneously in the three directions.
Some problems in 3-D real-time mapping of displacement and strain by Electronic Speckle Pattern Interferometry (ESPI) and a possible simple setup / COISSON E.; COISSON R.. - In: THE E-JOURNAL OF NONDESTRUCTIVE TESTING. - ISSN 1435-4934. - 10(2012).