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首页> 外文会议>Conference on Optical Design and Testing, Oct 15-18, 2002, Shanghai, China >Near-infrared spectroscopic measurement system of the constituent concentration based on acousto-optic tunable filter
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Near-infrared spectroscopic measurement system of the constituent concentration based on acousto-optic tunable filter

机译：基于声光可调谐滤光片的成分浓度近红外光谱测量系统

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摘要

The near-infrared spectroscopic measurement system of constituent concentration based on acousto-optic tunable filter (AOTF) is investigated in this paper. However, the diffracted beam is often mixed with zero order beam in AOTF optical system. In order to obtain high wavelength resolution and spectral signal-to-noise ratio (SNR), the solutions to improve the purity and efficiency of the diffracted light are proposed. The orthogonal polarizing method and the combined modulation method of optics and electronics are discussed. The results show that both methods can effectively eliminate the inference of zero order light. Especially, the combined modulation method not only can increase wavelength resolution and spectral signal-to-noise ratio but also simplify the optical system structure and reduce costs. The application concerning the determination of the milk principal constituents verifies the validity of this measuring instrument and analytical method. The results show that the speed is 30 seconds/sample. The milk principal constituents concentrations are determined with root mean square error of prediction (RMSEP): 0.1～0.2 g/dL Correlation coefficients between prediction values and reference values are higher than 0.9. Moreover, the results are reliable with coefficient of variation (Cv) of repeatability below 0.02. Obviously, the individual component's prediction accuracy and repeatability can meet practical measurement requirement.
机译：本文研究了基于声光可调滤光片（AOTF）的近红外光谱成分浓度测量系统。然而，在AOTF光学系统中，衍射光束经常与零级光束混合。为了获得高的波长分辨率和光谱信噪比（SNR），提出了提高衍射光的纯度和效率的解决方案。讨论了光学和电子学的正交偏振方法和组合调制方法。结果表明，两种方法都可以有效消除零阶光的推断。特别地，组合调制方法不仅可以提高波长分辨率和光谱信噪比，而且可以简化光学系统结构并降低成本。有关确定牛奶主要成分的申请证明了该测量仪器和分析方法的有效性。结果表明，速度为30秒/样本。牛奶的主要成分浓度由预测的均方根误差（RMSEP）确定：0.1〜0.2 g / dL预测值与参考值之间的相关系数大于0.9。此外，结果的重复性变异系数（Cv）低于0.02是可靠的。显然，单个组件的预测准确性和可重复性可以满足实际测量要求。

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