成分含量近红外快速检测技术及系统的研究

研究了基于声光可调谐滤光器(AOTF)分光原理的成分含量近红外检测技术及其系统组成，重点讨论了采用新颖的光电结合的调制方法提高衍射光的分离纯度和效率，以提高系统的光谱信噪比和光谱分辨率。同时文中介绍了近红外检测技术中不可分割的软件部分——化学计量学建模方法。最后通过对牛奶主要成分含量的实际测量验证了测量方法的有效性，实验结果表明，测量时间为30秒／样品，各成分含量的测量精度和重复性误差均能满足牛奶主要成分的实际测量要求。

Study on Rapid Measurement System of the Concentrations of Components by Near-infrared Spectroscopy

The near infrared spectroscopic measurement system of component concentrations based on AOTF is studied. In order to increase spectral resolution and signal to noise ratio, the combined modulation method of optics and electronics is employed to improve the purity and efficiency of the diffracted light. In addition, multivariate calibration, which is one of the indispensable parts of the near infrared spectroscopic analysis technology, is investigated. The application concerning the determination of the principal milk constituents verifies the validity of this measuring method. The results show that the speed is 30 seconds/sample, and both the individual component's prediction accuracy and repeatability can meet practical measurement requirement.