CPT原子频标数字温控系统优化设计与实现  

Optimization and Realization of Digital Temperature Control System for CPT Atomic Frequency Standard

作　　者：邓威[1] 张奕[2] 陈杰华[1] 田原[2] 吴红卫[1] 顾思洪[1,2] 

机构地区：[1]中国科学院原子频标重点实验室,湖北武汉430071 [2]武汉光电国家实验室,湖北武汉430074

出　　处：《电子学报》2012年第9期1889-1892,共4页Acta Electronica Sinica

基　　金：国家自然科学基金(No.10927403)

摘　　要：相干布局囚禁(Coherent Population Trapping,CPT)原子频标是一种功耗低、体积小、启动快的新型原子频标,温控系统是影响CPT原子频标稳定度指标的重要环节.本文介绍了通过优化设计实现CPT原子频标的高性能温控系统的方案.通过仪表放大器的应用提高了前端温度采集电路的温度分辨能力;通过小波分析算法对温度信号进行降噪处理;通过Δ-Σ算法实现脉冲宽度调制(Pulse Width Modulation,PWM),提高温控输出调节精度并减小谐波干扰.基于该方案实现了体积小、功耗低的温控电路,获得了较好的控温效果,改善了CPT原子频标频率稳定度指标.Coherent population trapping （CPT） atomic frequency standards are small-size and low-power consumption atom- ic frequency standards emerged in recent years. The frequency stability of a CPF atomic frequency heavily depends on the performance of its temperature control system. This article presents our optimization design scheme of the digital temperature control system. In the system the instrumentation amplifier is used to increase the resolution of the temperature measurement, the wavelet analysis de-noise method is used for signal de-noise process, the pulse width modulation （PWM） square wave is precisely modulated through Δ-Σalgorithm, the output resolution is increased, and the harmonic interference is reduced. The realized temperature control system is a small size low power consumption circuit with good performance. With the improved circuit the frequency stability of the CPr atomic frequency standard is improved. This developed temperature control system specially suits for applications in small-size and low-power consumption CPT atomic frequency standards.

关 键 词：数字温控 小波分析去噪 Δ-Σ算法 脉冲宽度调制 原子频标 

分 类 号：TP273[自动化与计算机技术—检测技术与自动化装置] O455.1[自动化与计算机技术—控制科学与工程]