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超声波穿金属厚壁通信电路系统设计与实现 被引量:2
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作者 李海廷 杨涛 《仪表技术与传感器》 CSCD 北大核心 2013年第3期33-35,39,共4页
在分析超声波穿金属厚壁通信系统需要高频高压的基础上,设计了一种利用电感储能产生高压脉冲的发射电路。采用FPGA产生高精度高频控制信号,驱动IGBT开关元件。同时在对介质表面声波透射状况分析后,设计了接收信号放大和带通滤波电路,实... 在分析超声波穿金属厚壁通信系统需要高频高压的基础上,设计了一种利用电感储能产生高压脉冲的发射电路。采用FPGA产生高精度高频控制信号,驱动IGBT开关元件。同时在对介质表面声波透射状况分析后,设计了接收信号放大和带通滤波电路,实现了超声信号的稳定接收。在接收信号包络检波和A/D采样转换后,通过FPGA处理实现了数据流的还原。该设计方案可实现密闭容器内信息的采集与高速传输,具有重要的应用前景。 展开更多
关键词 超声波通信 FPGA 发射接收电路 带通滤波 超声波信号处理
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Wavelet-based deconvolution of ultrasonic signals in nondestructive evaluation 被引量:2
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作者 HERRERA Roberto Henry OROZCO Rubén RODRIGUEZ Manuel 《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》 SCIE EI CAS CSCD 2006年第10期1748-1756,共9页
In this paper, the inverse problem of reconstructing reflectivity function of a medium is examined within a blind deconvolution framework. The ultrasound pulse is estimated using higher-order statistics, and Wiener fi... In this paper, the inverse problem of reconstructing reflectivity function of a medium is examined within a blind deconvolution framework. The ultrasound pulse is estimated using higher-order statistics, and Wiener filter is used to obtain the ultrasonic reflectivity function through wavelet-based models. A new approach to the parameter estimation of the inverse filtering step is proposed in the nondestructive evaluation field, which is based on the theory of Fourier-Wavelet regularized deconvolution (ForWaRD). This new approach can be viewed as a solution to the open problem of adaptation of the ForWaRD framework to perform the convolution kernel estimation and deconvolution interdependently. The results indicate stable solutions of the esti- mated pulse and an improvement in the radio-frequency (RF) signal taking into account its signal-to-noise ratio (SNR) and axial resolution. Simulations and experiments showed that the proposed approach can provide robust and optimal estimates of the reflectivity function. 展开更多
关键词 Blind deconvolution Ultrasonic signals processing Wavelet regularization
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