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双语推荐：软件锁相放大器

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针对准连续激光调制吸收光谱谐波信号的解调,设计了一种专用的准连续软件锁相放大器,对采集的数据做有效性判断、无效数据滤除、数字相敏检测、数字滤波等处理,实现了准连续激光调制吸收光谱的谐波信号解调。构建气体检测实验系统,对准连续软件锁相放大器和商品化的高性能锁相放大器进行了对比实验,结果表明,使用准连续软件锁相放大器的Allan方差比后者小1个数量级、检测限低2倍。并能够解决小占空比时的信号失锁问题,具有小的信号波形失真。
A software phase-locked amplifier demodulation method is proposed in order to demodulate the second harmonic (2 f) signal of quasi-continuous laser wavelength modulation spectroscopy (WMS) properly ,based on the analysis of its signal charac-teristics .By judging the effectiveness of the measurement data ,filter ,phase-sensitive detection ,digital filtering and other pro-cessing ,the method can achieve the sensitive detection of quasi-continuous signal .The method was verified by using carbon diox-ide detection experiments .The WMS-2 f signal obtained by the software phase-locked amplifier and the high-performance phase-locked amplifier (SR844) were compared simultaneously .The results show that the Allan variance of WMS-2 f signal demodula-ted by the software phase-locked amplifier is one order of magnitude smaller than that demodulated by SR844 ,corresponding two order of magnitude lower of detection limit .And it is able to solve the unlocked problem caused by the small duty cycle o

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研究并设计了基于LabVIEW的计算机与ESP301电动平移台、SR830锁相放大器之间的通信程序,实现了对电动平移台的运动控制和锁相放大器的数据采集。在上述工作的基础上编写出了太赫兹时域光谱系统的运动控制和数据采集程序,并通过对比实验验证程序的正确性。程序的单次太赫兹时域光谱测量时间约为185 s,为太赫兹时域光谱测量提供了方便、快速、准确的操作软件,同时也为后续研究工作奠定了基础。
A-communication-program-based-on-LabVIEW-among-the-computer,-the-ESP301-electric-translation-stage,-and-the-SR830-phase-locked-amplifier-is-proposed-to-realize-the-motion-control-of-the-electric-translation-stage-and-the-data-acquisition-of-the-phase-locked-amplifier.-On-this-basis,-a-program-which-can-realize-the-motion-control-and-data-acquisition-of-the-terahertz-time-domain-spectroscopy-system-is-written,-and-the-correctness-of-the-program-is-verified-by-comparative-experiment.-The-single-terahertz-time-domain-spectroscopy-measurement-time-of-program-is-about-185-s.-It-provides-a-convenient,-fast-and-accurate-operating-software-for-terahertz-time-domain-spectroscopy-measurement-and-lays-a-solid-foundation-for-the-expansion-of-the-follow-up-research-work.

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微弱信号检测技术在当今科学研究领域必不可少，其中锁相放大技术由于在速度和精度这两个方面都能达到很高的要求，因而在微弱信号检测领域得到大量使用。使用DSP Builder可以更加方便高效地进行设计。以DSP Builder软件为工具，介绍了正交矢量型数字锁相放大器各个模块的设计，并对整体设计进行了验证，仿真结果证实设计可行。
Nowadays the weak signal detection technology is necessary in scientific research field,in which the phase?locked amplifying technology is widely used in the field of weak signal detection because it can meet the requirements of high speed and high accuracy. DSP Builder software is adopted as a tool since DSP Builder can make the design more conveniently and efficiently. The design of each module in orthogonal vector type digital phase?locked amplifier is introduced in this paper. The overall design was verified. The simulation results confirm that the design is feasible.

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根据对激光器施加的调制信号是否连续,波长调制光谱分为连续和准连续调制激光吸收光谱技术。为了深入的比较研究这两种方案,设计准连续调制谱专用的软件锁相放大器,将准连续调制信号因间断产生的无效信号滤除后,再对吸收信号解调得到二次谐波信号。与连续激光调制谱软件解调的二次谐波信号进行了比较,结果表明,参数相同,准连续调制谱比连续调制谱的信噪比提高5%、检测限降低11.3%。在滤除无效信号后,准连续调制谱也可以解调出标准的二次谐波信号,因此有望用于与气体线型相关的研究中。该工作为选取更加适用的激光调制谱技术,提供了准确依据。
According to the modulation signal applied on laser diodes ,wavelength modulation spectroscopy (WMS) can be divid-ed into continuous wave (CW) WMS and quasi-continuous wave (QCW) WMS .In order to deeply compare CW-WMS and QCW-WMS ,we used a specific software-realized lock-in amplifier for continuous and quasi-continuous modulation signal demod-ulation .The invalid signal in quasi-continuous modulation spectrum was filtered off ,and then the effective detection signal was demodulated to obtain the second harmonic signal (WMS-2f) .It was compared with the 2f signal demodulated continuous laser modulation spectrum with software .The results show that while the same system parameters are set ,the signal-to-noise of the quasi-continuous modulation spectrum is 5% higher than the continuous modulation spectrum with software demodulation meas-urements ,and the detection limit is 11 .3% lower .And without the invalid signal in quasi-continuous modulation spectrum ,the standard WMS-2f signal can

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