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首页> 外文期刊>Review of Scientific Instruments >Digital signal processor-based high-precision on-line Voigt lineshape fitting for direct absorption spectroscopy
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Digital signal processor-based high-precision on-line Voigt lineshape fitting for direct absorption spectroscopy

机译：基于数字信号处理器的高精度在线Voigt线形拟合用于直接吸收光谱

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摘要

To realize on-line high-accuracy measurement in direct absorption spectroscopy (DAS), a system-on-chip, high-precision digital signal processor-based on-line Voigt lineshape fitting implementation is introduced in this paper. Given that the Voigt lineshape is determined by the Gauss full width at half maximum (FWHM) and Lorentz FWHM, a look-up table, which covers a range of combinations of both, is first built to achieve rapid and accurate calculation of Voigt lineshape. With the look-up table and raw absorbance data in hand, Gauss-Newton nonlinear fitting module is implemented to obtain the parameters including both the Gauss and Lorentz FWHMs, which can be used to calculate the integrated absorbance. To realize the proposed method in hardware, a digital signal processor (DSP) is adopted to fit the Voigt lineshape in a real-time DAS measurement system. In experiment, temperature and HO concentration of a flat flame are recovered from the transitions of 7444.36 cm and 7185.6 cm by the DSP-based on-line Voigt lineshape fitting and on-line integral of the raw absorbance, respectively. The results show that the proposed method can not only fit the Voigt lineshape on-line but also improve the measurement accuracy compared with those obtained from the direct integral of the raw absorbance.
机译：为了实现直接吸收光谱法（DAS）的在线高精度测量，本文介绍了一种基于片上系统，高精度数字信号处理器的在线Voigt线形拟合实现方法。鉴于Voigt线形是由高斯半峰全宽（FWHM）和Lorentz FWHM决定的，因此首先建立了涵盖两种组合范围的查找表，以实现快速准确的Voigt线形计算。借助查找表和原始吸光度数据，实现了高斯-牛顿非线性拟合模块以获取包括高斯和洛伦兹FWHM在内的参数，这些参数可用于计算积分吸光度。为了在硬件上实现所提出的方法，采用了数字信号处理器（DSP）将Voigt线形拟合到实时DAS测量系统中。在实验中，通过基于DSP的在线Voigt线形拟合和原始吸光度的在线积分分别从7444.36 cm和7185.6 cm的过渡中恢复了平坦火焰的温度和HO浓度。结果表明，与从原始吸光度的直接积分获得的方法相比，该方法不仅可以在线拟合Voigt线形，而且可以提高测量精度。

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