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近红外光谱仪主要性能指标及研究进展 总被引:1,自引:0,他引:1
介绍了近红外光谱仪的主要性能指标;对国内外在仪器硬件、测样附件、软件开发及新型仪器研制等方面的进展作了评述。总结了我国近红外光谱仪发展的成就与不足。讨论了近红外光谱仪的发展趋势,特别是我国近红外光谱仪发展中的关键问题。 相似文献
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在LabVIEW平台上对MicroNIR-1700微型近红外光谱仪开发了便携式近红外光谱检测系统。利用LabVIEW结合数据库开发的光谱仪测量分析处理程序,实现了光谱仪控制、样品指标测量、样品信息管理和系统使用权维护等功能。光谱的重复性试验和幸水桃的可溶性固形物含量实测试验表明,光谱仪在波长1000~1600nm范围内具有较高的重复性,实测试验中定标模型的校正集和预测集的相关系数r分别为0.902和0.867,均方根误差RMSECV和RMSEP分别为1.091,1.158,系统能满足一般实际应用的需求。 相似文献
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探讨了应用固定波长近红外光谱仪测定玉米淀粉含量的几个问题。在标定样品基准值测定中,玉米淀粉先脱糖对标定方程拟合质量的提高有明显效果。同时在选择标定样品时,去掉特殊类型的颗粒(小粒超小粒、爆花玉米、黑色粒、紫色粒等),并按颜色开标定预测方程,对提高测定精度也有一定作用。 相似文献
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近红外光谱仪器概况与进展 总被引:6,自引:4,他引:6
本文就近红外光谱仪器的发展概况以及各类近红外光谱仪器的工作原理、特点作了评述,指出了近红外光谱技术作为定笥和定量分析工具时应注意的问题。 相似文献
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双探测器结构的近红外光谱仪的研究 总被引:4,自引:1,他引:4
目的:为了提高近红外光谱探测信号的稳定性,研制了双探测器结构的滤光片型漫反射近红外光谱仪。方法:首先单色光被分束镜分成两束,一束光直接被一个探测器接受,另一束光经过积分球后照射到样品上,样品的漫散射光被积分球上的另一个探测器接受,然后将两个探测器的测量值相比较,最后计算出样品的吸光度。结果:应用该仪器检测了漫反射标准板的漫反射率,测量值与标称值的相关系数平均为0.995,标准偏差平均为0.01。另外使用该仪器测定了奶粉、牛奶及酱油的相关成分含量,近红外光谱与奶粉的蛋白质脂肪含量的相关系数高于0.9,与酱油及原奶的相关成分含量的相关系数高于0.8。结论:检测结果说明,自制双探测器结构的滤光片型近红外光谱仪可以获得样品的正确漫反射率,同时可以用于食品的成分分析。 相似文献
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用于食品成分分析的双探测器近红外光谱仪 总被引:1,自引:0,他引:1
研制了双探测器结构的滤光片型漫反射近红外光谱仪.用分束镜将单色光分成两束,一束光直接被一个探测器接收,另一束光经过积分球后照射到样品上,样品的漫散射光被积分球上的另一个探测器接收.将两个探测器的测量值相比较,计算出样品的吸光度.应用该仪器检测了漫反射标准板的漫反射率,测量值与标称值的相关系数平均为0.995,标准偏差平均为0.01.另外,使用该仪器测定了奶粉、牛奶及酱油相关成分含量,近红外光谱与奶粉的蛋白质和脂肪含量的相关系数>0.9,与酱油及原奶的相关成分含量的相关系数>0.8.检测结果表明,自制的双探测器结构滤光片型近红外光谱仪可以准确获得样品的漫反射率. 相似文献
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K. M. Aguilar-Castro J. J. Flores-Prieto E. V. Macías-Melo 《Journal of Mechanical Science and Technology》2014,28(1):293-300
We measured moisture content of ceramic plaster using near infrared reflectance spectroscopy (NIRS) as required by the ceramic industry. The moisture content and the normalized spectral reflectance were measured and correlated at the wavelengths of the spectral absorptance peaks (α λ ), spectral sensitivity peaks (S λ ) and normalized sensitivity peaks (S λn ), in the wavelength range of 900–2500 nm. The best model was obtained by the scanning method, normalizing the sensitivity and doing a minimization of the standard error of estimate (SE). The α λ -peaks, s λ -peaks and s λn -peaks were not found at the same wavelength, for the three studied wavebands. The optimal model in terms of SE was the linear model at 1420 nm (s λ -peak), for the ceramist drying range with a SE 1420 =1.25 (R2=0.96). The results indicate the feasibility of NIRS to non-contact moisture content measures of plaster in the studied range, even more for ceramist range. 相似文献
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《Flow Measurement and Instrumentation》2005,16(5):321-325
A new near infrared laser computed tomography test system is developed. The characteristics, construction, algorithm and performance of this system are analyzed. Simulation experiment results show that the image reconstruction speed and the resolution of this system can be improved easily. Research works also prove that the proposed near infrared computed tomography system is suitable for the parameter measurement of two-phase flow. 相似文献
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近红外漫反射式谷物成份分析系统的研究 总被引:1,自引:0,他引:1
本文介绍了应用漫反射技术以及旋转滤光片的近红外分析系统。本系统用以测定谷物的水份、蛋白、脂肪等成份。利用微机实现样品中各种成份含量的自动测量。本系统与传统的化学分析法相比,具有分析速度快、准确度较高及使用方便等特点 相似文献
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Henry PS 《The Review of scientific instruments》1979,50(2):185
In this paper we describe a new electronic instrument called a spectrum expander, which is a two-port digital signal-processing device whose output power spectrum Sout(f) is (approximately) a frequency-expanded replica of its input spectrum Sin(f): Sout(Ef) approximately Sin(f), where E is the expansion ratio (usually E>2). When inserted between a signal source and a spectrometer, the spectrum expander improves the effective resolution of the spectrometer, thereby permitting real-time, high-resolution measurements to be made. This capability is especially important in radio astronomy, where fixed-resolution multichannel filter spectrometers are common. Our treatment of the spectrum expander includes a discussion of its basic principles, formulation of design rules, a brief study of random noise and quantization effects, and presentation of data illustrating expander performance. The prototype expander, constructed from Schottky-TTL components, accepts any signal of bandwidth< or =12.5 MHz and expands it to fill a 128-channel spectrometer with 32-MHz total bandwidth. Signal degradation caused by processing with the spectrum expander is minimal; the signal-to-noise ratio at its output is measured to be approximately 0.1 dB lower than at its input. 相似文献