Reaserch Of Mura Defects Detection Method Based On B-Spline Surface Fitting And Snake Model

With the development of modern sonar technology, Hydroacoustic transmitter’s signal bandwidth become more wider that makes the hydroacoustic broadband matching has become one of the key technology of Hydroacoustic transmitter. Since hydroacoustic transducers’ impedance reactance exists, and no rule changes with frequency which makes difficult to apply traditional matching method. This paper focuses on the problem of hydroacoustic broadband matching, proposed a method to introduce the real frequency data method to broadband Hydroacoustic matchingThrough the traditional theory of Bode-Fano-Euler Research theory on broadband matching,It verify the real frequency data method is introduced to broadband matching accuracy. this paper analyzed and summarized the basic principles of the real frequency data method, derivation the original real frequency data method and the simple frequency data method’s process detailed. In summary, Summarize previous work and make own improvements are as follows:add non-minimum reactance, using optimized resistance band equalizer and based on further derivation of TPG( transmit power gain). After the completion of improvements, By a specific load simulation demonstrate the validity of the improved model. Whether it is the original real frequency data method or the improved real data frequency method that can not avoid is a function of the network topology optimization, real frequency data method is generally use the least squares method. This paper attempts using genetic algorithms, genetic algorithm can find the global optimal solution to enhance the performance of broadband matching.In underwater acoustics often take the broadband matching network, underwater acoustic transducer and amplifier as a whole. The role of hydroacoustic signal amplifier is amplify the signal emitted by the source occurred. and output to the next level. It can be seen as the left end of the two-terminal network matching circuit excitation source, a broadband matching is the best validation carrier. The issue according to project requirements, designed the class AB amplifier and Class D amplifier. Class D amplifier design, the amp amplifier use IGBT instead of the common parts selection MOSFET, enhance the maximum power limit class D amplifier, and to make it more Conform to the needs.Finally, from the practical application of the subject,this paper use the actual project transducer ZT40-16 for the load, using the improved real frequency method, designed to achieve a broadband matching network circuit. By MATLAB simulation and practical test of 4294 A impedance analyzer, verified the effectiveness of the matching network. The hydroacoustic is introduced into the matching circuit power amplifier, Through its efficiency and the output level of the sound source test has showed tha thydroacoustic transmitter performance has been greatly improved.