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折扣與優(yōu)惠:團購最低可5折優(yōu)惠 - 了解詳情 | 論文格式:Word格式(*.doc) | ![]() |
摘要:在當(dāng)今社會中,電力的使用愈加廣泛,不同環(huán)境中不同設(shè)備對電力信號的要求也各不相同,這時,常常需要對電力信號進(jìn)行頻譜分析以確定其是否符合各項要求。 本系統(tǒng)通過對系統(tǒng)自產(chǎn)生的正弦波采樣,對采樣所得結(jié)果進(jìn)行快速傅立葉算法分析,測得輸入信號的頻率、相位及頻譜信息,分析測得的信息,研究得出最適合的采樣頻率(當(dāng)輸入信號頻率一定時),以達(dá)到校準(zhǔn)系統(tǒng)的目的。本系統(tǒng)通過信號變換模塊對外接電力信號進(jìn)行電壓變換,使其符合C8051F020的采樣要求,通過按鍵模塊設(shè)置采樣頻率,C8051F020對輸入信號進(jìn)行采樣、快速傅立葉變換算法分析,在LCD1602上顯示分析得出的頻率、相位,并將測得的頻譜信息通訊到上位機上,以待進(jìn)一步研究。 本系統(tǒng)可以檢測輸入信號的頻率、相位及頻譜信息。 關(guān)鍵詞:電力信號;C8051F020;快速傅立葉變換;LCD1602;通訊
Abstract:Nowadays,electric power is widely used.Under different environments,different devices have different requirements for power signal.At this moment,it is necessary for the power signal to analyze the frequency spectrum so that the power signal can be determined whether it complies with all the requirements. This system takes samples of the sine wave signal which is sent from C8051F020 and analyses the sampling results through FFT,then there will be frequency, phase and spectrum analysis of the input signal.Analysing the measured information,the most suitable sampling frequency can be gotten out(the frequency of input signal is constant),so that the system can be calibrated.This system transforms the voltage of external power signal into the appropriate value for C8051F020.Through the key module,sampling frequency can be set.C8051F020 takes samples of the input signal,and analyses the sampling results through FFT.Frequency and phase can be displayed on the LCD1602.Spectrum information measured by C8051F020 can be communicated to the PC,so that it can be used in the further research. This system can measure the frequency,phase and spectrum information of the input signal. Key word:power signal;C8051F020;FFT;LCD1602;communication
本系統(tǒng)可以設(shè)置DAC0輸出正弦波頻率和ADC0采樣頻率,對DAC0輸出正弦波頻率進(jìn)行采樣、快速傅立葉變換算法分析與實現(xiàn),實現(xiàn)對系統(tǒng)的校準(zhǔn);可以對外接電力信號進(jìn)行采樣,計算出其頻率、相位及頻譜信息。 本系統(tǒng)系統(tǒng)中,DAC0查表數(shù)據(jù)只有64個,采樣點數(shù)128點,采樣DAC0輸出正弦波時,采樣所得結(jié)果與理想值并不完全相同,可以通過增加DAC0查表數(shù)據(jù)和采樣點數(shù)來減小誤差。 在以后的設(shè)計中,可以優(yōu)化系統(tǒng)程序,使系統(tǒng)測算更準(zhǔn)確,也可以將實時監(jiān)測功能加入系統(tǒng)中,減小系統(tǒng)使用難度,增大其適用范圍。
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