Application of Time-of-Flight Near Infrared Spectroscopy for Detecting Sugar and Acid Contents in Apples

2004 ◽  
Vol 52 (9) ◽  
pp. 2434-2439 ◽  
Author(s):  
Satoru Tsuchikawa ◽  
Takahiro Hamada
Keyword(s):  
Infrared Spectroscopy ◽  
Near Infrared Spectroscopy ◽  
Near Infrared ◽  
Time Of Flight

scholarly journals Time-of-flight Near-infrared Spectroscopy for Nondestructive Measurement of Internal Quality in Grapefruit

2013 ◽  
Vol 138 (3) ◽  
pp. 225-228 ◽  
Author(s):  
Yohei Kurata ◽  
Tomoe Tsuchida ◽  
Satoru Tsuchikawa
Keyword(s):  
Infrared Spectroscopy ◽  
Near Infrared Spectroscopy ◽  
Prediction Accuracy ◽  
Near Infrared ◽  
Time Of Flight ◽  
Soluble Solids ◽  
Internal Quality ◽  
Citrus Paradisi ◽  
Least Squares Regression ◽  
Time Resolved

We proposed a technique combining time-of-flight (TOF) and near-infrared spectroscopy (NIRS), termed TOF-NIRS, capable of measuring the time-resolved profiles of near-infrared (NIR) light with nanosecond resolution. Analysis of the variation in time-resolved profiles was used to estimate soluble solids concentration (SSC) and acidity in grapefruit (Citrus paradisi), and the prediction accuracy was compared with the conventional NIR measurement device. In data processing, the cross-correlation function, which evaluated the similarity between the reference and transmitted beams, was introduced as an explanatory variable for partial least squares regression. TOF-NIRS predicted both SSC and acidity in grapefruit with higher precision than the conventional NIR measurement with respective r values of 0.72 and 0.85. Specifically, the superiority of TOF-NIRS was attributed to measurement time and prediction accuracy in determining acidity.

Optical characteristics of wood investigated by time-of-flight near infrared spectroscopy

Holzforschung ◽  
2011 ◽  
Vol 65 (3) ◽  
Author(s):  
Yohei Kurata ◽  
Takaaki Fujimoto ◽  
Satoru Tsuchikawa
Keyword(s):  
Infrared Spectroscopy ◽  
Near Infrared Spectroscopy ◽  
Near Infrared ◽  
Optical Measurement ◽  
Time Of Flight ◽  
Optical Path Length ◽  
Sample Thickness ◽  
Optical Characteristics ◽  
Time Resolved ◽  
Main Components

Abstract A new optical measurement system, the main components of which are a diode-pumped solid state laser and avalanche photodiodes, was introduced to clarify the optical characteristics of wood from the viewpoint of time-of-flight near infrared spectroscopy. The sample thickness and the wavelength of input pulsed laser clearly influenced the transmitted time-resolved profile. The effective optical path length became 15 times longer than the sample thickness. The optical model based on the diffusion approximation to the radiative transfer equation proved to be useful for thick samples, which can be optically regarded as an ideal diffuser, although wood is a structural material with non-homogeneous cellular structure.

scholarly journals Application of Time-of-flight Near-infrared Spectroscopy to Detect Sugar and Acid Content in Satsuma Mandarin

2003 ◽  
Vol 128 (3) ◽  
pp. 391-396 ◽  
Author(s):  
Satoru Tsuchikawa ◽  
Emiko Sakai ◽  
Kinuyo Inoue ◽  
Kumi Miyamoto
Keyword(s):  
Infrared Spectroscopy ◽  
Near Infrared Spectroscopy ◽  
Acid Content ◽  
Near Infrared ◽  
Free Acid ◽  
Sugar Content ◽  
Time Of Flight ◽  
Soluble Solids ◽  
Optical Parameters ◽  
Time Resolved

Time-of-flight near infrared spectroscopy (TOF-NIRS) was applied to the detection of sugar and acid content in Satuma mandarin (Citrus unshiu Marc). The combined effects on the time resolved profiles of soluble solids, free acids, laser beam wavelength, and detection position of transmitted light were investigated in detail. Attenuance of peak maxima (At) and time delay of peak maxima (Δt) increased as sugar content increased. However, these optical parameters decreased with increases in acid content. In the case of a model sample of a polyurethane block immersed in specified solutions, At and Δt decreased by adding sucrose or citric acid. These results suggested that time resolved profile was governed not only by the concentration of soluble solid or free acid but also by other inherent factors of a fruit; for example, an optical characteristic of tissue or difference in refractive index between the tissue substance and the liquid. Results indicated the optimum optical parameters for detection of sugar and acid content were At and Δt, respectively.

Assessment of variations in air-dry wood density using time-of-flight near-infrared spectroscopy

2014 ◽  
Vol 10 (1) ◽  
pp. 57-68 ◽  
Author(s):  
Guillaume Hans ◽  
Ryunosuke Kitamura ◽  
Tetsuya Inagaki ◽  
Brigitte Leblon ◽  
Satoru Tsuchikawa
Keyword(s):  
Infrared Spectroscopy ◽  
Wood Density ◽  
Near Infrared Spectroscopy ◽  
Near Infrared ◽  
Time Of Flight ◽  
Dry Wood
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