光谱学与光谱分析 |
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The Validation of the Effect of Correcting Spectral Background Changes Based on Floating Reference Method by Simulation |
WANG Zhu-lou, ZHANG Wan-jie, LI Chen-xi, CHEN Wen-liang*, XU Ke-xin |
State Key Laboratory of Precision Measuring Technology and Instruments, Tianjin University, Tianjin 300072, China |
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Abstract There are some challenges in near-infrared non-invasive blood glucose measurement, such as the low signal to noise ratio of instrument, the unstable measurement conditions, the unpredictable and irregular changes of the measured object, and etc. Therefore, it is difficult to extract the information of blood glucose concentrations from the complicated signals accurately. Reference measurement method is usually considered to be used to eliminate the effect of background changes. But there is no reference substance which changes synchronously with the anylate. After many years of research, our research group has proposed the floating reference method, which is succeeded in eliminating the spectral effects induced by the instrument drifts and the measured object’s background variations. But our studies indicate that the reference-point will changes following the changing of measurement location and wavelength. Therefore, the effects of floating reference method should be verified comprehensively. In this paper, keeping things simple, the Monte Carlo simulation employing Intralipid solution with the concentrations of 5% and 10% is performed to verify the effect of floating reference method used into eliminating the consequences of the light source drift. And the light source drift is introduced through varying the incident photon number. The effectiveness of the floating reference method with corresponding reference-points at different wavelengths in eliminating the variations of the light source drift is estimated. The comparison of the prediction abilities of the calibration models with and without using this method shows that the RMSEPs of the method are decreased by about 98.57%(5%Intralipid)and 99.36%(10%Intralipid)for different Intralipid. The results indicate that the floating reference method has obvious effect in eliminating the background changes.
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Received: 2013-11-20
Accepted: 2014-03-24
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Corresponding Authors:
CHEN Wen-liang
E-mail: chenwenliang@tju.edu.cn
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