基于LabVIEW 6. i 軟件平臺,采用快速傅里葉變換( FFI) 算法,設計了虛擬儀器(VI) 程序,對任
何電量輸出傳感器周期信號的直流分量,各諧波分量的幅值和初相位進行測試。利用這個VI 程序還可以測量兩個同頻率信號的相位差。最后以兩個實例運行了這個VI 程序,各測量數據相對誤差不大于0. 17 %。
關鍵詞: 虛擬儀器; 快速傅里葉變換算法; 程序設計; 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