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Advanced portable four-wavelength NIR analyzer for rapid chemical composition analysis

机译：先进的便携式四波长NIR分析仪，用于快速化学成分分析

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Abstract: This paper discusses the requirements for a portable infrared analyzer and presents the design of a four wavelength NIR analyzer utilizing the integrated multichannel detector technique for wavelength separation and detection. This technique, together with an electrically modulated miniature tungsten filament source and surface mount electronics manufacturing, provides a compact, rugged handheld instrument construction without any moving parts. Improved accuracy and short stabilization time is achieved through a combination of thermoelectric temperature stabilization in the four channel detector and a calculated signal compensation for the residual temperature error. Parallel analog phase sensitive detection of the detector signal maximizes the S/N ratio and maintains the simultaneity of the measurement. All composition calculations are performed in a microcomputer built inside the analyzer. The weight of the prototype analyzer is about 1 kg and a NiCd battery pack provides capacity for hundreds of single measurements or about 3 hours of continuous operation. Two prototype instruments have been fabricated with optimized NIR wavelengths for the moisture measurement of milled fuel peat on production fields. The accuracy of digitized two-wavelength signal ratios were tested in the laboratory over time and against temperature. Full accuracy is achieved in 10 seconds after switch-on and the maximum short time peak-to-peak variation in the signal ratios is 0.2%. The errors due to temperature fluctuations in the range from $PLU@2 to $PLU@50$DGR@C are between $MIN@0.4 to $PLU@0.6%. The instruments were calibrated using 102 samples of Finnish milled fuel peat. the cross-validation testing of calibration gave a standard deviation of 1.6% (moisture by weight) compared to the reference method. Other applications for the analyzer are being planned in wood processing and chemical industries as well as in agriculture.!3
机译：摘要：本文讨论了便携式红外分析仪的要求，并提出了一种采用集成多通道检测器技术进行波长分离和检测的四波长近红外分析仪的设计。这项技术与电调制微型钨丝源和表面安装电子设备制造一起，提供了一种紧凑，坚固的手持式仪器结构，没有任何活动部件。通过将四通道检测器中的热电温度稳定功能与计算出的信号补偿残余温度误差相结合，可以提高准确性和缩短稳定时间。检测器信号的并行模拟相位敏感检测可最大程度地提高信噪比，并保持测量的同时性。所有成分计算均在分析仪内部的微型计算机中进行。原型分析仪的重量约为1千克，镍镉电池组可提供数百次单次测量或约3个小时的连续运行能力。已经制造出两种具有最佳NIR波长的原型仪器，用于在生产现场测量磨碎的泥煤的水分。在实验室中随时间和温度对数字化的两波长信号比率的准确性进行了测试。接通电源后的10秒内即可达到完全精度，并且信号比率的最大短时峰峰值变化为0.2％。由温度波动引起的误差在$ PLU @ 2至$ PLU @ 50 $ DGR @ C之间，介于$MIN@0.4至$PLU@0.6%之间。使用102个芬兰研磨过的燃料泥炭样品对仪器进行了校准。与参考方法相比，校准的交叉验证测试得出的标准偏差为1.6％（重量水分）。该分析仪的其他应用正在木材加工和化学工业以及农业中规划！！ 3

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