Study On Measuring Technique Of Ultrasonic Radiation Force Based On Machine Micro-vision

In order to satisfy the needs of the theoretical research on ultrasonic radiation force and the application of ultrasonic micromanipulation(UMM), combing with National Natural Science Fund Program "the technical research on remote manipulation of micro-components based on 3D controllable ultrasonic radiation force field", a measuring technique of ultrasonic radiation force based on machine micro-vision is developed, which is realized by means of the method that phase-angle position of the rigid body in the 2D image is characterized by the ID sequence signal by using the method of equiangular sampling feature extraction based on circle windows, and then the generalized correlation algorithm for estimation of time delay based wavelet transform is used to acquire the angular and translation displacement, finally the ultrasonic radiation force is determined by the relation between force and motion. The contents of this dissertation are presented as below:Chapter 1, a survey of important role of the research on ultrasonic radiation force measuring techniques is given, the review of current status and future development trend of micro-force measuring technology is summarized, the effectivity and superiority of the machine micro-vision measurement technology is indicated clearly ,and then the research content of this dissertation is presented and each chapter of this dissertation is arranged.Chapter 2, the image signal is interfered usually by noise by reason of the complicacy of micromanipulation condition and the multiformity of operation object, and after the principles and shortcomings of classical image denoising algorithm are analyzed, a new algorithms named adaptive thresholding image denoising based on second generation wavelet transform is presented, afterwards, experimentation based on computer simulation is used to investigate this approach and experiment results show the advantages of the presented method.Chapter 3, the performance of some corner detection technologies in common use is analyzed and compared, and then an innovative corner detection and its matching algorithm base on multi-scale wavelet is developed, experiments show the advantages of the presented method.Chapter 4, after the characteristic of the rigid plane motion is studied and the shortcomings of classical digital image correlation algorithm are analyzed, the phase-angle position of the rigid body in the 2D image is characterized by the 1D sequence signal by using the method of equiangular sampling feature extraction based on circle windows. And then the generalized correlation algorithm for estimation of time delay based wavelet transform is used to acquire the angular and translation displacement. Finally the ultrasonic radiation force is determined by the relation between force and motion. The experiment results indicate that the presented technique has advantages of fast speed and high precision and has broken trough the restriction that the conventional method was only applied to measure the stationary signal with irrelevant noise.Chapter 5, as the last chapter, the important results and conclusions of this dissertation are summarized and the prospect for the application of ultrasonic...