Thermal Deformation Measurement Of Mechanical Parts With Speckle Interference Methods

Speckle interferometry method is a modern optical measurement technology, With the traditional measurement of resistance strain gages, moire measurement method, it is non-contact, anti-Miscellaneous-interference, high precision, surface without merit special treatment, was widely used in optical rough surface deformation measurements and nondestructive testing. This paper machine parts dynamic deformation process heat displacement measurement, research from the speckle pattern interferometry optical system structures to the interference fringes image processing and data analysis of the entire process.Based on the dual-beam displacement measurement system of the mathematical model structures speckle interferometry thermal deformation of the experimental system, in view of the complex optical system debugging features, this method of optical system has been optimized structures, devices can effectively improve the system revealed construction quality and reduce debugging time. Speckle against interference fringes images with a large number of noise information, the paper on the various de-noising algorithm index reached low-pass filter can effectively remove electronic speckle pattern interferometry stripes speckle particles in the image noise . Denoising in the speckle pattern interferometry stripe domain image segmentation process, this paper, the principle of iterative method and algorithm. The segmentation, a two-step refinement algorithm interference fringes from the skeleton, and tracking algorithm using stripes on the fringes and carry out rectification. In this paper, the experimental data and theoretical data for comparison, the experimental results agree well with the theoretical value. Therefore it that the method of laser speckle experimental results are reliable.