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《Modern Electronics Technique》 2008-12
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Method and Appication of Multi-period Frequency Measurement

LI Guangming,YANG Lei(Dongguan University of Technology,Dongguan,523808,China)  
To measure frequency of the atmospheric pressure by using the electrically-induced resonator pressure transducer,multi-period measurement method is employed,which obtains accurate results by dividing signal frequency.Accurate atmospheric pressure is obtained via temperature compensation with the environmental temperature acquired from the ADC on P89LPC935.The prerequisite for using this period measuring method is choosing a crystal oscillator with its accuracy better than 5 ppm.Thereby the minimum measuring error can be controlled within 0.001 1 μs.The presented measuring method is successfully used in the automatic weather station developed through our cooperation with Henan Weather Bureau.The two important conditions for using the multi-period measurement method to measure a signal period(frequency) accurately and fast are: the signal has highly-stable frequency and is a continuous signal;the crystal oscillator of the single chip is an external highly-accurate and highly-stable crystal oscillator.
【Fund】: 河南省科技攻关计划资助项目(0124140203)
【CateGory Index】: TM935.1
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