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 Wysłany: Sob 21:02, 25 Gru 2010 Temat postu: ugg milano Raman scattering distributed optical fi |
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Raman scattering distributed fiber optic sensor signal processing system
One n one by one ~ U - 010020030040050060070080090010 one thousand one hundred and eleven nf one by one ~ one thousand one hundred and eleven U] J010020030040050060070080090010 11,111,111 n n one by one a few one ... one hundred and eleven. . -U-. . 【『010020030040050060070080090010 one hundred and eleven. One hundred and eleven. One hundred and eleven. .... . . . -II. 1__LJ. LL-. J A '... ... one by one' one ... a ■. r. Oh,'''11 '_r'Yl a 010020030040050060070080090010. One by one .... One. J one by one. . . . . ▲. . . ・ ■ I one by one ... ... _ a ■ 010020030040050060070080090010. . . . ... ~ ~ A ... one by one from m LJJJ Hill 01002003004005006007008009001000 Haar wavelet decomposition of Figure 5 with the summation of the signal in Figure 6 is the result of wavelet denoising and the combination of low-pass filter the signal received map. It can be seen, the use of wavelet denoising and 1000 using cumulative average low-pass filter method of combining substantially eliminate high frequency noise, so as to signal post-processing - build the temperature field measurement, reducing the system's temperature response time to create the conditions, while maintaining the temperature of the system resolution of 0.1 ℃, a spatial resolution of less than 4ITI, to the general production requirements. If only the original signal using cumulative average low-pass filter, in order to achieve the same effect of temperature measurement,[link widoczny dla zalogowanych], the need for more and longer cumulative number of times the temperature settling time. Figure 7 is the original signal by using cumulative average of 10,000 low-pass filtered received signal. 3 Zhanggui Tao, et al: Raman scattering distributed optical fiber sensor system,[link widoczny dla zalogowanych], signal processing 75SignalProcessingofDistributedOpticalSensorSystemBasedonRaman-ScatteringZHANGGui-tao. ZHANGHong-guang (1 ・ DpartmentofManagementScienceandEngineering,[link widoczny dla zalogowanych], QingdaoUniversjty, Qingda. 266071, China; 2.Yanzh. UDongfangElectricCO.ITD, Zoucheng273515, China) Abstract: BasedoncharacteristicsofRamanscatteringandthesignalsfeature, thispaperprOposedapro-jectusngwaVeletsprinciplethatcanremovedthenoise, increasedthepracticalperformanceofthissvs-tem ・ lhen, thispaperd. scussedhowtOselectedproperwaveletfunctionandhowtodeterminereasonablewaVeletdecompostonleVelsforthesakeofrealizationofwaveletdenoising, andusingmatlabtosimulatethem. th. dsintroducedabove,[link widoczny dla zalogowanych], theresultofsimulationshowsthatwaveletdenoisingiseffective,[link widoczny dla zalogowanych], themeth-odcanreducehghfrequencynoise ・ IftheformerresultisdeposedwecangetthetemperatureofthewholeKYwords: distributedtemperaturemeasurement; ramanscattering; wave1etsdenoising
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