A Research On Electronic Speckle Pattern Interferometry And Its Application In The Measurements Of Gears' Thermal Deformation Errors

In the past, speckles have been regarded as noise. However, they are also found to be the carrier of information. Electronic speckle pattern interferometry, which is developed from the researches on speckles, has become a modern computer optical measurement method. ESPI's advantages of full-field, non-contact, disturbance-proof and high precision make it develop rapidly and become one of the heat-discussed topics around the world. The present research mainly focuses on the application of ESPI technology in the measurements of the thermal deformation of mechanical parts, and studies the regular change pattern of gears'dentiform errors when they are heated.Based on the understanding of the statistical properties of speckles and their physical models, the research firstly performs confirmatory experiments to rationalize the feasibility of the application of ESPI in the measurements of the thermal deformation errors of mechanical parts. Then, focusing on gears'dentiform thermal errors, the research proposes two methods for the measurements of out-of-plane and in-plane displacements. The two methods are compared through experiments. Finally the method for the measurements of in-plane displacement is chosen.The light paths are constructed in the present research and the relative software are written. The real-time measurements of dentiform thermal errors are realized. The present research provides new ways and means for the measurements of the thermal deformation of mechanical parts, especially those with complex shapes and appearances.