智能近红外光谱数据采集与处理系统研制.pdf

第27卷第4期
电子测量与仪器学报
Vol 27 No 4
2013年4月
JJOURNAL OF ELECTRONIC MEASUREMENT AND INSTRUMENT
319
DOI:10.3724/SP.J.1187.2013.00319
智能近红外光谱数据采集与处理系统研制”
刘晓光门晓金窦曼莉石春吴刚
(中国科学技术大学自动化系工业自动化研究所合肥230027)
摘要:根据对近红外光谱仪智能化和便捷化的使用需求,设计实现了一种信号增益可自适应调节的高精度便携式近红
外光谱仪数据采集系统,并提出了一种更加便捷有效的光谱预处理算法。系统采用可编程增益的模数转换器AD9826,并
利用FPGA实现对其增益的自适应调节。自适应增益调节算法最高支持6倍增益放大,可有效减小AD9826非线性误差的
影响,使仪器的性噪比高达68dB。基于参数自适应辨识的SG阈值滤波算法使得光谱图像既平滑又不失真,在良好的滤
波效果下,仍能让仪器分辨率保持小于10m。研制的数据采集与处理系统能更好的体现仪器智能化的发展方向,应用前
景广阔。
关键词;增益自适应调节;参数自适应辨识;SG阈值滤波;智能化;近红外光谱仪
中图分类号:TP274.2文献标识码;A国家标准学科分类代码:460.4035
Development of intelligent data acquisition and processing
system for near-infrared spectrum
Liu Xiaoguang Men Xiaojin Dou Manli Shi Chun Wu Gang
(Institute of Industrial Automation of Department of Automation, University of Science and
echnology of China, Hefei 230027, China)
Abstract According to intelligent and convenient requirements, a kind of portable near infrared spectrometer data
acquisition system with the faction of gain self-adaptation algorithm is developed. The data acquisition system con-
tains an analog-to-digital converter AD9826, in which the gain is programmable. The faction of gain self-adaptation
algorithm supports up to 6 gain of amplifier which can effectively reduce the nonlinearity of AD9826, and make
the SNR of instrument up to 68 db. SG threshold filtering algorithm based on the parameter adaptive identification
can make spectral images smoothly and no distortion. The test results show that the resolution of the instrument is
less than 10 nm in the case of a good filtering effect. The developed data acquisition system with the faction of gain
self-adaptation algorithm makes the instrument more intelligent, and shows broad application prospects.
Keywords gain self-adaptation; parameter adaptive identification; SG threshold filter; intelligent; near
infrared spectrometer
外光谱仪中的光学检测器件主要为CCD(电荷耦
合器件)和PDA(光敏二极管阵列),短波NIR光
近红外光谱分析(NR)是近年来发展最为迅谱区常用硅基CCD,长波NIR光谱区常用 INGAAS
速的高新技术之一,它具有快速、高效、无损和适基光敏二极管阵列(PDA)。
合在线分析等诸多优点,在农业、制药和石化等领
基于PDA的近红外光谱仪的分光系统采用全
域得到广泛的应用,取得了很好的效果,并向小型息凹面光栅技术,内部无可移动部件,仪器稳定性
化、专用化、智能化方向发展。目前,用于近红和抗干找性较好,同时大大缩小了仪器体积,符合
收稿日期:2012-12 Received Date:2012-12
*基金项目:国家自然科学基金青年基金(3100072)资助项目
万方j数据