傳感器輸出信號(hào)諧波分量的虛擬儀器測(cè)量

基于LabVIEW 6. i 軟件平臺(tái),采用快速傅里葉變換( FFI) 算法,設(shè)計(jì)了虛擬儀器(VI) 程序,對(duì)任
何電量輸出傳感器周期信號(hào)的直流分量,各諧波分量的幅值和初相位進(jìn)行測(cè)試。利用這個(gè)VI 程序還可以測(cè)量?jī)蓚€(gè)同頻率信號(hào)的相位差。最后以兩個(gè)實(shí)例運(yùn)行了這個(gè)VI 程序,各測(cè)量數(shù)據(jù)相對(duì)誤差不大于0. 17 %。
關(guān)鍵詞: 虛擬儀器; 快速傅里葉變換算法; 程序設(shè)計(jì); 諧波分析
Abstract : Based on LabVIEW 6. i software workbench , using fast Fourier transform (FFT) algorithm ,design2 ing virtual instrument (VI) program ,direct currents parts ,amplitude and initial phase of resonance wave parts from electricity2out sensors signal is measured. Using VI program two similar frequency signals phase difference is measured. Final , two actual examples run this VI program , greatest relative error of measurement numbers is
0. 17 %.
Key words : virtual instrument (VI) ; fast Fourier transform( FFT) algorithm; program designing ; resonance wave analysis