石英晶体参数快速牛顿测量法及系统设计  

System Design of Fast Measuring Quartz Crystal Based on Newton Method

作　　者：蔡湘平[1] 李东[1] 

机构地区：[1]北京信息科技大学北京市机电系统测控重点实验室,北京100192

出　　处：《计算机测量与控制》2011年第7期1578-1581,共4页Computer Measurement &Control

基　　金：北京市自然科学基金(KZ200811232018);现代测控技术教育部重点实验室资助

摘　　要：石英晶体参数的快速和准确测量是石英晶体元件加工控制和成品检测的重要指标;介绍了基于π网络零相位法的石英晶体参数测量方法,并在此基础上,研制了以DSP和FPGA为核心的嵌入式数字鉴相处理系统,测量过程中系统直接控制信号发生器,并在数字信号处理器中实现快速牛顿下山测量算法,使得平均只需要进行5次搜索,就可以锁定石英晶体的谐振频率,从而实现晶体谐振频率的快速测量;实验表明系统测量精度达到2PPM,平均测量时间小于0.5秒。It is needed to fast measure series resonant frequency of high-precision quartz crystal,which is important index for processing the parts and detecting the product of quartz crystal.In order to improve the precision of phase-difference detection,digital phase-demodulation is studied in this paper;it measure the quartz crystal based on Newton method.A hardware system based on DSP and FPGA is developed.The series resonant frequency of quartz crystal is detected by this system and the detectable error is within 2PPM.The Newton method is realized in this system,the average time for measuring Less than 0.5s.

关 键 词：石英晶体 谐振频率 牛顿下山测量算法 

分 类 号：TP206[自动化与计算机技术—检测技术与自动化装置]