Based on the pulse-shaping unit in the front end of high-power laser facilities,we propose a new hybrid scheme in a closed-loop control system including wavelet threshold denoising for pretreatment and a first derivat...Based on the pulse-shaping unit in the front end of high-power laser facilities,we propose a new hybrid scheme in a closed-loop control system including wavelet threshold denoising for pretreatment and a first derivative adaptive smoothing filter for smooth pulse recovery,so as to effectively restrain the influence of electrical noise and FM-to-AM modulation in the time–power curve,and enhance the calibration accuracy of the pulse shape in the feedback control system.The related simulation and experiment results show that the proposed scheme can obtain a better shaping effect on the high-contrast temporal shape in comparison with the cumulative average algorithm and orthogonal matching pursuit algorithm combined with a traditional smoothing filter.The implementation of the hybrid scheme mechanism increased the signal-to-noise ratio of the laser pulse from about 11 dB to 30 dB,and the filtered pulse is smooth without modulation,with smoothness of about 98.8%.展开更多
In view of the merits and demerits of current oil spill visualization methods,the paper involves a study on a new type of visualization approach targeting oil spill at sea.To be specific,the visualization of sea oil s...In view of the merits and demerits of current oil spill visualization methods,the paper involves a study on a new type of visualization approach targeting oil spill at sea.To be specific,the visualization of sea oil spill is implemented with the adoption of texture projection method.The texture projection-induced jaggedly edge is displayed in the performance test results.Under the circumstance,Gauss smoothing filter is introduced to secure the smooth convergence of texture edge and thus bring forth satisfactory dynamic visualization effect.Already,this means has already been successfully applied to the Oil Spill Emergency 3D Drilling System,which evidenced the validity and reliability of the new method.展开更多
基金the Strategic Priority Research Program of the Chinese Academy of Sciences(No.XDA25020303).
文摘Based on the pulse-shaping unit in the front end of high-power laser facilities,we propose a new hybrid scheme in a closed-loop control system including wavelet threshold denoising for pretreatment and a first derivative adaptive smoothing filter for smooth pulse recovery,so as to effectively restrain the influence of electrical noise and FM-to-AM modulation in the time–power curve,and enhance the calibration accuracy of the pulse shape in the feedback control system.The related simulation and experiment results show that the proposed scheme can obtain a better shaping effect on the high-contrast temporal shape in comparison with the cumulative average algorithm and orthogonal matching pursuit algorithm combined with a traditional smoothing filter.The implementation of the hybrid scheme mechanism increased the signal-to-noise ratio of the laser pulse from about 11 dB to 30 dB,and the filtered pulse is smooth without modulation,with smoothness of about 98.8%.
基金the National High Technology Research and Development Program of China(“863”Program)[No.2015AA016404]Marine public welfare industry research[No.201505017-4]the Fundamental Research Funds for the Central Universities[No.3132016310].
文摘In view of the merits and demerits of current oil spill visualization methods,the paper involves a study on a new type of visualization approach targeting oil spill at sea.To be specific,the visualization of sea oil spill is implemented with the adoption of texture projection method.The texture projection-induced jaggedly edge is displayed in the performance test results.Under the circumstance,Gauss smoothing filter is introduced to secure the smooth convergence of texture edge and thus bring forth satisfactory dynamic visualization effect.Already,this means has already been successfully applied to the Oil Spill Emergency 3D Drilling System,which evidenced the validity and reliability of the new method.
