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<table border="0" cellpadding="3" cellspacing="1" width="100%" class="forumline"> <tr> <th class="thCornerL" width="22%" height="26">Autor</th> <th class="thCornerR">Wiadomość</th> </tr> <tr> <td width="22%" align="left" valign="top" class="row1"><span class="name"><a name=""></a><b>loczytzn</b></span></td> <td class="row1" height="28" valign="top"><table width="100%" border="0" cellspacing="0" cellpadding="0"> <tr> <td width="100%"><img src="http://picsrv.fora.pl/subSilver/images/icon_minipost.gif" width="12" height="9" alt="Post" title="Post" border="0" /><span class="postdetails">Wysłany: Czw 22:22, 13 Sty 2011<span class="gen"> </span> Temat postu: Moncler jacken Ultrasonic testing of the second sa</span></td> </tr> <tr> <td colspan="2"><hr /></td> </tr> <tr> <td colspan="2"><span class="postbody">Ultrasonic testing of the second sampling <br /> <br /> <br />M factors; then use the parameters from the second sampling interval sampling of the implementation. Design process is shown in Figure 1 and Figure 2. Sampling interval algorithm flow chart in Figure 1 Experimental Comparison of the center frequency f 2, a 7.5MHz ultrasound radio frequency signal,<a href="http://www.monclerjackens.net" target="_blank" class="postlink">Moncler jacken</a>, the A / D sample obtained after the source of the sample taken 2Os sequence (n), length of the N-10000; and then a second sample, Sample sequences are shown y (rn), length of the M-512. Figure 3a and c, as shown in Figure 2 taken the time domain to maintain a good flow and consistency of the source sequence waveform, but also in the process needs to retain some of the characteristics according to information here capture the peak . Respectively, z () and (G) for discrete Fourier transform (DTFT), have spectral density X () and Y (ea) (Fig. 3b and d), is still the center frequency 7.5MHz, but Y (ei ) center frequency bandwidth than the x (e) of the large, low frequency components increase in locally distorted. 3 Conclusion second sampling method is simple, the code overhead, the effect is similar to () low-pass filter; in the treatment of the defect can retain the characteristics of the sample peaks, including the magnitude of the sample and the sample sequence in the source the location,<a href="http://www.monclerjackens.net" target="_blank" class="postlink">moncler günstig</a>, it is a good quantitative assessment of defect size and position. But it applies to the source sample sequence length J \, larger than the display samples of the sequence length M (preferably N \References: E1] Li Jiawei, CHEN Ji Mao. NDT Manual [M]. Beijing: Mechanical Industry Press, 2002. [2] Feng Ruo. Ultrasound Manual [M]. Nanjing: Nanjing University Press,<a href="http://www.monclerjackens.net" target="_blank" class="postlink">moncler outlet</a>, 1997. Hong Yong et al: Ultrasonic testing of samples in the second helmet Jiao I '『I_0200040006000800010000 length (a) before processing the length of time-domain waveform 01O0200300400 (c) time domain waveforms after a second sampling 1O050512 Figure 3 results 0246810 Frequency / MHz (b) frequency domain before processing the waveform frequency / MHz (d) the frequency domain waveform after E3] VaidyanathanPP. MuhirateSystemsandFilterBanks [4] Hu Guang book. Digital Signal Processing - Theory, Algorithm and Implementation of EM]. North l-M]. EnglewoodCliffsNJ: Prentice-Hall, 1993. Beijing: Tsinghua University Press,<a href="http://www.stivaliuggsitalia.com" target="_blank" class="postlink">ugg prezzo</a>, 1997. . . . . . . . . GB/T19348.1-2003 and GB/T19348.2-2003 standard has been officially released GB/Tl9348.1-2003 \2-2003 \page). . 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Meeting received Science and Technology, Ministry of Education, Chinese Academy of Sciences, National Natural Science Foundation of China and the UNESCO Commission and the Hong Kong Institution of Engineers support. The General Assembly established the World Federation of Engineering Organizations, the first General Assembly, held in China is the highest level of engineering the largest international event industry. The theme is shaping the future of sustainable development engineers. The General Assembly established around the theme of the seven groups will be the issue. For questions breakout sessions, background and overview of the General Assembly, essay topics and submission requirements, please visit the Materials and Testing Network (www.mat-test.corn). 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