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

Kurata, Yohei; Fujimoto, Takaaki; Tsuchikawa, Satoru

doi:10.1515/hf.2011.034

Cited by 8 publications

(4 citation statements)

References 22 publications

(20 reference statements)

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“…72 an 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 nonhomogeneous cellular structure. 73 In general, the radiation absorbed by the sample is the product of the absorption coefficient and the path-length through the sample. However, as mentioned above, in diffuse reflection there is no definite path-length through the sample.…”

Section: Radiation Scattering As a Combination Of Various Effectsmentioning

confidence: 99%

A Review of Band Assignments in near Infrared Spectra of Wood and Wood Components

Schwanninger

Rodrigues

Fackler

2011

Journal of Near Infrared Spectroscopy

553

479

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Near infrared (NIR) spectra of wood and wood products contain information regarding their chemical composition and molecular structure. Both influence physical properties and performance, however, at present, this information is under-utilised in research and industry. Presently NIR spectroscopy is mainly used following the explorative approach, by which the contents of chemical components and physico-chemical as well as mechanical properties of the samples of interest are determined by applying multivariate statistical methods on the spectral data. Concrete hypotheses or prior knowledge on the chemistry and structure of the sampleexceeding that of reference data-are not necessary to build such multivariate models. However, to understand the underlying chemistry, knowledge on the chemical/functional groups that absorb at distinct wavelengths is indispensable and the assignment of NIR bands is necessary. Band assignment is an interesting and important part of spectroscopy that allows conclusions to be drawn on the chemistry and physico-chemical properties of samples. To summarise current knowledge on this topic, 70 years of NIR band assignment literature for wood and wood components were reviewed. In addition, preliminary results of ongoing investigations that also led to new assignments were included for discussion. Furthermore, some basic considerations on the interactions of NIR radiation with the inhomogeneous, anisotropic and porous structure of wood, and what impact this structure has on information contained in the spectra, are presented. In addition, the influence of common data (pre)-processing methods on the position of NIR bands is discussed. For more conclusive band assignments, it is recommended that wood is separated into its components. However, this approach may lead to misinterpretations when evaluation methods other than direct comparison of spectra are used, because isolation and purification of wood components is difficult and may lead to chemical and structural alterations when compared to the native state. Furthermore, "pure" components have more distinct and symmetric bands that influence the shape of the spectra. This extended review provides the reader with a comprehensive summary of NIR bands, as well as some practical considerations important for the application of NIR to wood.

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Section: Radiation Scattering As a Combination Of Various Effectsmentioning

confidence: 99%

A Review of Band Assignments in near Infrared Spectra of Wood and Wood Components

Schwanninger

Rodrigues

Fackler

2011

Journal of Near Infrared Spectroscopy

553

479

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“…Analysis of the models statistics parameters demonstrated the possibility of substantial savings in time and costs for wood analysis. Kurata et al [61] investigated the optical characteristics of wood by Time-of-Flight NIRS. They introduced a new optical measurement system, the main components of which are a diode-pumped solid state laser and avalanche photodiodes.…”

Section: Othersmentioning

confidence: 99%

A review of recent application of near infrared spectroscopy to wood science and technology

2015

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This review article introduces recent scientific and technical reports due to near infrared spectroscopy (NIRS) at wood science and technology, most of which was published between 2006 and 2013. Many researchers reported that NIR technique was useful to detect multi traits of chemical, physical, mechanical and anatomical properties of wood materials although it was widely used in a state where characteristic cellular structure was retained. However, we should be sensitive and careful for application of NIRS, when spectra coupled with chemometrics presents unexpected good results (especially, for mechanical physical and anatomical properties). The real application for on-line or at-line monitoring in wood industry is desired as next step. Basic spectroscopic research for wooden material is also progressed. It should be a powerful and meaningful analytical spectroscopic tool.

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“…The first studies on cellulosic material using TOF spectroscopy were reported by Tsuchikawa et al [5][6][7] They mainly investigated the relationships between TR profiles and wood properties. Recently, the application of TR diffuse optical spectroscopy for the determination of optical properties of wood was reported by some research groups.…”

Section: The Light Scattering Contribution To Nir Spectra Inmentioning

confidence: 99%

Holistic research of diffusely reflected light in cellulosic materials

Tsuchikawa

2020

NIR news

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This paper introduces some applications of time-of-flight or time-resolved spectroscopy to cellulosic materials like wood. Time-of-flight or time-resolved spectroscopy uses short pulses of light illumination where a portion of the light is scattered but most of the light propagates through the sample. By using such technique, we could know that the light scattering contribution to near infrared spectra in wood is significant because it is a complex and highly scattering medium due to its cellulosic structure.

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

Cited by 8 publications

References 22 publications

A Review of Band Assignments in near Infrared Spectra of Wood and Wood Components

A Review of Band Assignments in near Infrared Spectra of Wood and Wood Components

A review of recent application of near infrared spectroscopy to wood science and technology

Holistic research of diffusely reflected light in cellulosic materials

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