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Open AccessArticle

Rapid-Detection Sensor for Rice Grain Moisture Based on NIR Spectroscopy

1,2, 1,2, 3, 3, 1,2 and 1,2,*
College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou 310058, China
Key Laboratory of Spectroscopy Sensing, Ministry of Agriculture, Hangzhou 310058, China
College of Information Engineering, Nanchang Hangkong University, Nanchang 330063, China
Author to whom correspondence should be addressed.
Appl. Sci. 2019, 9(8), 1654;
Received: 21 March 2019 / Revised: 8 April 2019 / Accepted: 15 April 2019 / Published: 22 April 2019
(This article belongs to the Section Environmental and Sustainable Science and Technology)
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Rice grain moisture has a great impact on th production and storage storage quality of rice. The main objective of this study was to design and develop a rapid-detection sensor for rice grain moisture based on the Near-infrared spectroscopy (NIR) characteristic band, aiming to realize its accurate and on-line measurement. In this paper, the NIR spectral information of grain samples with different moisture content was obtained using a portable NIR spectrometer. Then, the partial least squares (PLS) and competitive adaptive reweighted squares (CARS) were applied to model and analyze the spectral data to find the rice grain moisture NIR spectroscopy. As a result, the 1450 nm band was sensitive to the rice grain moisture and a rapid-detection sensor was developed with a 1450 nm light emitting diode (LED) light source, InGaAs photodiode, lens and filter, whose basic principle is to establish the relationship between the rice grain moisture and the measured voltage signal. To evaluate the sensor performance, rice grain samples with 13–30% moisture content were detected, the coefficient of determination R2 was 0.936, and the sum of squares for error (SSE) was 23.44. It is concluded that this study provides a spectroscopic measuring method, as well as developing an effective and accurate sensor for the rapid determination of rice grain moisture, which is of great significance for monitoring the quality of rice grain during its production, transportation and storage process. View Full-Text
Keywords: NIR spectroscopy; rice grain moisture; 1450 nm; rapid-detection sensor NIR spectroscopy; rice grain moisture; 1450 nm; rapid-detection sensor

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Lin, L.; He, Y.; Xiao, Z.; Zhao, K.; Dong, T.; Nie, P. Rapid-Detection Sensor for Rice Grain Moisture Based on NIR Spectroscopy. Appl. Sci. 2019, 9, 1654.

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