1. Introduction
Sugarcane (Sacchaum spp.) is an important crop in Thailand, valued between US$ 1.2-1.6 billion per year [1]. the increasing adoption of precision agriculture technique in the sugarcane industry, however current these technique can only monitor cane yield and have no ability to measure the product quality[2]. The common technologies used to measure sugar content in 0Brix unit in a laboratory are refract metric, polar metric, chromatographic and NIR spectroscopic methods. Several research reports have shown that spectroscopic methods can be successfully used to predict quality of sugarcane base on juice samples [3,4,5]. Previous research has also performed spectroscopic analysis on shredded cane but however, the small size of the sample cell and the restricted number of wavelengths of the filter instrument limited the accuracy of this research, Resent studies have shown that the latest portable spectroscopic technology with Vis/NIR spectrometer is able to provide a rapid and nondestructive measurement of product quality for several crops in the field. For sugarcane, a research report that both handheld Vis/NIR (305-1075 nm) and full rang (350-2500 nm) spectroradiometers were used to determine the quality attributes of sugarcane by scanning the cross sectional surface of the stalk and showed R2 around 0.68-0.71 [6]. However, there is no available published study regarding the use of FT NIRs in reflectance mode for determining sugar content of sugarcane based on stalk cross sectional scanning. Fourier transform near infrared spectroscopy (FT-NIR) is a method that has the added advantages of improved speed and resolution, or signal-to-noise ratio, over the conventional dispersive NIR method. However, the disadvantage of FT-NIR is the relatively high cost of instrumentation [7]. Thus, the objective of this research was to evaluate the ability of the spectroscopic technique as a rapid tool to predict sugar content of sugarcane using a high resolution FT-NIRs spectrometer.
1. Introduction Sugarcane (Sacchaum spp.) is an important crop in Thailand, valued between US$ 1.2-1.6 billion per year [1]. the increasing adoption of precision agriculture technique in the sugarcane industry, however current these technique can only monitor cane yield and have no ability to measure the product quality[2]. The common technologies used to measure sugar content in 0Brix unit in a laboratory are refract metric, polar metric, chromatographic and NIR spectroscopic methods. Several research reports have shown that spectroscopic methods can be successfully used to predict quality of sugarcane base on juice samples [3,4,5]. Previous research has also performed spectroscopic analysis on shredded cane but however, the small size of the sample cell and the restricted number of wavelengths of the filter instrument limited the accuracy of this research, Resent studies have shown that the latest portable spectroscopic technology with Vis/NIR spectrometer is able to provide a rapid and nondestructive measurement of product quality for several crops in the field. For sugarcane, a research report that both handheld Vis/NIR (305-1075 nm) and full rang (350-2500 nm) spectroradiometers were used to determine the quality attributes of sugarcane by scanning the cross sectional surface of the stalk and showed R2 around 0.68-0.71 [6]. However, there is no available published study regarding the use of FT NIRs in reflectance mode for determining sugar content of sugarcane based on stalk cross sectional scanning. Fourier transform near infrared spectroscopy (FT-NIR) is a method that has the added advantages of improved speed and resolution, or signal-to-noise ratio, over the conventional dispersive NIR method. However, the disadvantage of FT-NIR is the relatively high cost of instrumentation [7]. Thus, the objective of this research was to evaluate the ability of the spectroscopic technique as a rapid tool to predict sugar content of sugarcane using a high resolution FT-NIRs spectrometer.
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