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本文介绍一种短波近红外(700～1100nm)过程分析仪的研制与应用。仪器在722型单光束光栅分光光度计的基础上研制成,包括光源、光栅单色器、硅探测器、信号放大、A/D转换、8位单片微型计算机、数码显示和RS-232C串行通讯接口等几部分,它具有光谱扫描、串行通讯及分析结果预测功能。仪器校正采用PLS(偏最小二乘)回归法。在应用方面,根据氨水在短波红外区的吸收光谱,利用所研制的仪器实现了氨浓度的非破坏性分析,对于氨浓度为0～13.5mol/L的试样,预测标准差(SEP)为0.116mol/L。
This article describes the development and application of a short-wave near-infrared (700 ~ 1100nm) process analyzer. The instrument was developed on the basis of 722 single-beam grating spectrophotometer, including light source, grating monochromator, silicon detector, signal amplification, A / D conversion, 8-bit single chip microcomputer, digital display and RS-232C serial Line communication interface and other parts, it has spectral scanning, serial communication and analysis of the results predicted. Instrument calibration using PLS (partial least squares) regression. In terms of application, based on the absorption spectrum of ammonia in the shortwave infrared region, the nondestructive analysis of ammonia concentration was realized by using the developed instrument. The predicted standard deviation (SEP) for samples with ammonia concentration of 0 ~ 13.5mol / L was 0.116 mol / L.