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A Study on the Performance Characteristics of Portable Analyzer for Determination of Sugar Content in Citrus Unshiu using Near Infrared Spectroscopy  

Yoon, Sung-Un (조선대학교 기계공학과)
Ma, Sang-Dong (조선대학교 대학원 정밀기계공학과)
Kim, Myung-Yun (서강정보대학 자동차과)
Kim, Jae-Yeol (조선대학교 첨담금형부품소재 BK21 사업단)
Publication Information
Transactions of the Korean Society of Machine Tool Engineers / v.15, no.5, 2006 , pp. 1-6 More about this Journal
Abstract
The purpose of this study is to develop to portable near infrared analyzer measuring the sugar content of the fruits on a tree before harvesting ones. The portable near infrared system consists of a tungsten lamp, a coaxial optical fiber bundle and a multi-channel detector, which has 256 pixels and a concave transmission grating. Reflectance NIR spectra of orange were recorded by using a coaxial optical fiber bundle. The spectra were collected over the spectral range $400{\sim}1100nm$. Partial least squares regression(PLSR) was applied for a calibration and validation for determination of sugar contents. The multiple correlation coefficient was 0.99 and standard errors of calibration(SEC) was 0.069 brix. The calibration model predicted the sugar content for validation set with standard errors of prediction(SEP) of 0.092 brix. The sugar content in fruits was successfully quantified using the portable near infrared analyzer.
Keywords
Near Infrared Spectroscopy; Sugar Contents; Partial Least Squares Regression; Portable Fruit Analyzer;
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