现代电子技术
現代電子技術
현대전자기술
MODERN ELECTRONICS TECHNIQUE
2015年
8期
136-138
,共3页
频率测量%声表面波%传感器%中界频率
頻率測量%聲錶麵波%傳感器%中界頻率
빈솔측량%성표면파%전감기%중계빈솔
frequency measurement%SAW%sensor%intermediate frequency
传统的频率测量方法不足之处较多，即使用单一测频法在频率的上下限处测量的误差较大。在此设计了一种新型测频法及其测量电路。即利用声表面波带通滤波器对被测频率进行预选，高于中界频率的信号用测频法，低于中界频率的信号用侧周法，试验结果表明新型测频法的硬件电路在辅以高速数字器件后，系统测量精度比传统测频法有相对提高，具有在各个行业推广应用的价值。
傳統的頻率測量方法不足之處較多，即使用單一測頻法在頻率的上下限處測量的誤差較大。在此設計瞭一種新型測頻法及其測量電路。即利用聲錶麵波帶通濾波器對被測頻率進行預選，高于中界頻率的信號用測頻法，低于中界頻率的信號用側週法，試驗結果錶明新型測頻法的硬件電路在輔以高速數字器件後，繫統測量精度比傳統測頻法有相對提高，具有在各箇行業推廣應用的價值。
전통적빈솔측량방법불족지처교다，즉사용단일측빈법재빈솔적상하한처측량적오차교대。재차설계료일충신형측빈법급기측량전로。즉이용성표면파대통려파기대피측빈솔진행예선，고우중계빈솔적신호용측빈법，저우중계빈솔적신호용측주법，시험결과표명신형측빈법적경건전로재보이고속수자기건후，계통측량정도비전통측빈법유상대제고，구유재각개행업추엄응용적개치。
The shortcomings of the traditional frequency measuring methods are discussed in this paper. A new method of frequency measurement based on SAW sensor and a measuring circuit are designed. The frequency is preselected by SAW band?pass filter. The signal which is higher than intermediate frequency is measured by the method of frequency measurement and pe?riod measurement for others. The hardware circuit is composed of high speed digital devices. The system has high accuracy and is worth to spread.
