基于解调原理的莫尔信号特征分离技术研究  

Research on Separation Technology of Moiré Signal Feature Based on Demodulation Method

作　　者：白冰 朱维斌 黄垚 薛梓[3] BAI Bing;ZHU Wei-bin;HUANG Yao;XUE Zi(School of Metrology and Measurement Engineering,China Jiliang University,Hangzhou 310018,China;College of Optical Science and Engineering,Zhejiang University,State Key Laboratory of Modern Optical Instrumentation,Hangzhou 310027,China;National Institute of Metrology,Beijing 100029,China)

机构地区：[1]中国计量大学计量测试工程学院,浙江杭州310018 [2]浙江大学光学科学与工程学院,现代光学仪器国家重点实验室,浙江杭州310027 [3]中国计量科学研究院,北京100029

出　　处：《仪表技术与传感器》2022年第7期74-78,共5页Instrument Technique and Sensor

基　　金：国家自然科学基金项目(52175526);国家重点研发计划(2017YFF0204901);国家质量监督检验检疫总局科技计划(2016QK189)。

摘　　要：文中针对传统的转台测角系统工作状态监测方法中,依赖标定平台、工作量大等缺点,对基于解调原理的莫尔信号特征分离技术开展研究。在分析莫尔信号特征产生原理的基础上,对莫尔信号特征分离方法进行阐述;设计基于FPGA的整圆周莫尔信号采集电路,详细说明了电路中ADC、SDRAM等参数设计方法。实验证明信号采集电路功能的有效性和莫尔信号特征分离方法的有效性,实验结果表明被测对象的莫尔信号特征的0至七次谐波明显,且各谐波幅值重复性偏差在-0.2~0.25 mV之间,转台测角系统工作时莫尔信号特征无明显波动。In this paper,a research on separation technology of Moirésignal characteristics based on demodulation was pro⁃posed,which overcame the disadvantages of relying on calibration platform and heavy workload caused by traditional monitoring method of turntable angle measurement system.Based on the analysis of the generating principle of Moirésignal characteristics,the principle of separation method of Moirésignal characteristics was elaborated.An FPGA-based circumferential Moirésignal ac⁃quisition circuit was designed and the parameters of ADC and SDRAM were analyzed in detail.The separation method of Moirésignal characteristics and the circuit function were verified by experiments.The experimental results show that the Moirésignal characteristics of the measured object has obvious 0~7 harmonics.The repeatability deviation of each harmonic amplitude is be⁃tween-0.2 mV and 0.25 mV,which indicate that the Moirésignal characteristics have no obvious fluctuation when the turntable angle measuring system is working.

关 键 词：转台测角系统 莫尔信号 解调 FPGA 电路 谐波分析 

分 类 号：TH712[机械工程—测试计量技术及仪器]