space distribution of strains

Study of Surface Microstrains by Electron Speckle-Interferometry Methods

Despite the fact that speckle interferometry methods began to develop more than 30 years ago, they still remain a rather exotic laboratory tool that has not received wide practical application in tensometry measurements and flaw detection. There are two reasons. The first one is the problem to interpret the interferograms by the right way. The second one is the extremely low measurement speed, which makes it impossible to use these methods for study of fast processes.