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Sensors 2015, 15(6), 12560-12572; doi:10.3390/s150612560

Characterization of Wheat Varieties Using Terahertz Time-Domain Spectroscopy

1
State Key Laboratory of Transducer Technology, Institute of Electronics, Chinese Academy of Sciences, Beijing 100080, China
2
University of the Chinese Academy of Sciences, Beijing 100080, China
3
Key Laboratory of Grain Information Processing & Control, Ministry of Education, Zhengzhou 450001, China
*
Author to whom correspondence should be addressed.
Academic Editor: W. Rudolf Seitz
Received: 19 April 2015 / Accepted: 21 May 2015 / Published: 27 May 2015
(This article belongs to the Section Chemical Sensors)
View Full-Text   |   Download PDF [2045 KB, uploaded 27 May 2015]   |  

Abstract

Terahertz (THz) spectroscopy and multivariate data analysis were explored to discriminate eight wheat varieties. The absorption spectra were measured using THz time-domain spectroscopy from 0.2 to 2.0 THz. Using partial least squares (PLS), a regression model for discriminating wheat varieties was developed. The coefficient of correlation in cross validation (R) and root-mean-square error of cross validation (RMSECV) were 0.985 and 1.162, respectively. In addition, interval PLS was applied to optimize the models by selecting the most appropriate regions in the spectra, improving the prediction accuracy (R = 0.992 and RMSECV = 0.967). Results demonstrate that THz spectroscopy combined with multivariate analysis can provide rapid, nondestructive discrimination of wheat varieties. View Full-Text
Keywords: terahertz time-domain spectroscopy; wheat varieties; absorption spectrum; interval partial least squares terahertz time-domain spectroscopy; wheat varieties; absorption spectrum; interval partial least squares
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Ge, H.; Jiang, Y.; Lian, F.; Zhang, Y.; Xia, S. Characterization of Wheat Varieties Using Terahertz Time-Domain Spectroscopy. Sensors 2015, 15, 12560-12572.

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