小波去噪法在复合材料变形测量中的应用研究

为了提高数字散斑相关方法（DSCM）在复合材料变形测量中的精度，将数字散斑技术与小波去噪技术相结合，采用阈值去噪法对小波系数进行阈值量化处理，并进行复合材料的拉伸试验，同时使用DSCM及引伸计进行测量，再使用该小波去噪法对DSCM测量的结果进行去噪，并与引伸计所测结果相比较。结果表明：去噪后的DSCM的测量结果与引伸计测量的结果吻合得更好，精度更高，说明该小波去噪法能够较好地去除数字散斑相关测量和计算中的噪声。

Deformation Measurement of Composites by Wavelet Denoising

Investigation for wavelet denoising based on digital speckle correlation method(DSCM) is introduced in this paper. In order to improve the accuracy of deformation measurement with the digital speckle correlation method in composites, digital speckle technology is combined with wavelet denoising technology, and threshold denoising method is used to threshold quantification for wavelet coefficients. In order to demonstrate the denoising method applying to deformation measurement of composites using digital speckle correlation method, this paper performs the tensile test of composites. And this wavelet denoising method is used to results of the measurement with digital speckle correlation method. The test reveals an agreement with measurement results of the extensometer. The wavelet denoising method used in the digital speckle correlation method to eliminate the noises is better.