Directional Characteristics of Near Infrared Light Reflected from Wood

Holzforschung ◽  
2001 ◽  
Vol 55 (5) ◽  
pp. 534-540 ◽  
Author(s):  
Satoru Tsuchikawa ◽  
Misato Torii ◽  
Shigeaki Tsutsumi
Keyword(s):  
Cellular Structure ◽  
Near Infrared ◽  
Incident Angle ◽  
Incident Light ◽  
Sample Thickness ◽  
The Other ◽  
Infrared Light ◽  
Near Infrared Light ◽  
Reflected Light ◽  
Directional Characteristics

Summary A near infrared auto-goniophotometer was designed to acquire detailed information on optical characteristics of a biological material which had a cellular structure, such as wood. The reflected light, which originated from the irradiation of polarized near infrared light, was separated into an unpolarized and a polarized component by using two polarizing filters. The standardized reflected intensities of each component at various incident angles θ and observation angles η, ρup (θ, η) and ρp (θ, η), were measured. Sitka spruce samples with various thicknesses were used. The measurements showed that the directional characteristics of the unpolarized component were affected significantly by the irradiation conditions and the sample thickness. Particularly, these varied with the wavelength of incident light λ. This shows that the directional characteristics models we proposed previously are reasonable. On the other hand, matrices of the directional characteristics for polarized components typically show an elliptical shape which is strongly affected by incident angle and only slightly by λ. Based on these results, the effects of sample thickness on the spectral directional characteristics were determined.

Directional Characteristics of near Infrared Light in the Process of Radiation and Transmission from Wood

1998 ◽  
Vol 6 (1) ◽  
pp. 47-53 ◽  
Author(s):  
Satoru Tsuchikawa ◽  
Misato Torii ◽  
Shigeaki Tsutsumi
Keyword(s):  
Cellular Structure ◽  
Near Infrared ◽  
Incident Light ◽  
Three Dimensional ◽  
Picea Sitchensis ◽  
Sample Thickness ◽  
Infrared Light ◽  
Observation Angle ◽  
Optical Information ◽  
Directional Characteristics

In this report, a newly designed apparatus, that is, a near infrared auto-goniophotometer, was introduced to acquire detailed optical information about biological material having a cellular structure like wood. Such information allows us to analyse the three-dimensional physical condition of a sample and confirm the suitability of proposed optical models. The directional characteristics could be found on the basis of the intensity of reflected or transmitted light at each observation angle. In these experiments, Sitka spruce ( Picea sitchensis Carr.) with various thicknesses were used. Results of these measurements showed the directional characteristics which were affected significantly by the illumination conditions and sample thickness. Particularly, these varied characteristically with the wavelength of the incident light. This result supports the validity of the proposed optical models which vary with wavelength. Throughout these analyses, the relationships between the physical aspects of a sample and the emitted light from it is being clarified.

Nondestructive Measurement of the Subsurface Structure of Biological Material Having Cellular Structure by Using Near-Infrared Spectroscopy

1996 ◽  
Vol 50 (9) ◽  
pp. 1117-1124 ◽  
Author(s):  
Satoru Tsuchikawa ◽  
Kazuo Hayashi ◽  
Shigeaki Tsutsumi
Keyword(s):  
Surface Roughness ◽  
Infrared Spectroscopy ◽  
Near Infrared Spectroscopy ◽  
Cellular Structure ◽  
Near Infrared ◽  
Incident Light ◽  
Physical Conditions ◽  
Light Passing ◽  
Nir Light ◽  
Reflected Light

Biological materials–wood is a typical example–are widely used in a state where not only the cellular structure but also its bulky shape is retained. NIRS (near-infrared spectroscopy) may be called for as a promising technique to analyze the physical state of such materials as well as the chemical composition. In this report, the effects of physical conditions found in wood on the absorption of NIR radiation are examined. In the experiments, conifers (Sitka spruce) that had various degrees of surface roughness and different orientations of fibers to the direction of incident light were used. Results of these measurements showed that the orientation of fibers and the surface roughness of wood were directly related to the absorbance. In addition, it became clear that the behavior of diffusely reflected light in wood could be expressed by Kubelka–Munk theory and fell into three categories according to the characteristic of the absorption and scattering coefficient. On the basis of these results, a new concept for the behavior of NIR light passing through material made of hollow fibers has been proposed.

An ordered copper nanowell-array film with near-perfect broadband absorption from ultraviolet to near-infrared light

2020 ◽  
Vol 59 (11) ◽  
pp. 110906
Author(s):  
Juan Shen ◽  
Yong Ren ◽  
Xinxin Zhu ◽  
Min Mao ◽  
Quan Zhou ◽  
...  
Keyword(s):  
Near Infrared ◽  
Infrared Light ◽  
Near Infrared Light ◽  
Broadband Absorption

scholarly journals Recent Near-Infrared Light-Activated Nanomedicine toward Precision Cancer Therapy

2021 ◽  
Author(s):  
Xiaowei Luan ◽  
Yongchun Pan ◽  
Yanfeng Gao ◽  
Yujun Song
Keyword(s):  
Cancer Therapy ◽  
Near Infrared ◽  
Infrared Light ◽  
Human Society ◽  
Near Infrared Light ◽  
History Of ◽  
The Universe

Light has witnessed the history of mankind and even the universe. It is of great significances to the life of human society, contributing to energy, agriculture, communication, and much more....

scholarly journals Au–ZnO Conjugated Black Phosphorus as a Near-Infrared Light-Triggering and Recurrence-Suppressing Nanoantibiotic Platform against Staphylococcus aureus

Pharmaceutics ◽  
2021 ◽  
Vol 13 (1) ◽  
pp. 52
Author(s):  
Atanu Naskar ◽  
Sohee Lee ◽  
Kwang-sun Kim
Keyword(s):  
Staphylococcus Aureus ◽  
Bacterial Infections ◽  
Near Infrared ◽  
Au Nanoparticles ◽  
Synthesis Method ◽  
Antibacterial Properties ◽  
Black Phosphorus ◽  
Infrared Light ◽  
Resistant Bacteria ◽  
Near Infrared Light

Antibiotic therapy is the gold standard for bacterial infections treatment. However, the rapid increase in multidrug-resistant (MDR) bacterial infections and its recent use for secondary bacterial infections in many COVID-19 patients has considerably weakened its treatment efficacy. These shortcomings motivated researchers to develop new antibacterial materials, such as nanoparticle-based antibacterial platform with the ability to increase the chances of killing MDR strains and prevent their drug resistance. Herein, we report a new black phosphorus (BP)-based non-damaging near-infrared light-responsive platform conjugated with ZnO and Au nanoparticles as a synergistic antibacterial agent against Staphylococcus aureus species. First, BP nanosheets containing Au nanoparticles were assembled in situ with the ZnO nanoparticles prepared by a low-temperature solution synthesis method. Subsequently, the antibacterial activities of the resulting Au–ZnO–BP nanocomposite against the non-resistant, methicillin-resistant, and erythromycin-resistant S. aureus species were determined, after its photothermal efficacy was assessed. The synthesized nanocomposite exhibited excellent anti-S. aureus activity and good photothermal characteristics. The non-resistant S. aureus species did not produce drug-resistant bacteria after the treatment of multiple consecutive passages under the pressure of the proposed nanoantibiotic, but rapidly developed resistance to erythromycin. This work clearly demonstrates the excellent photothermal antibacterial properties of Au–ZnO–BP nanocomposite against the MDR S. aureus species.

π-Conjugated Copolymers Composed of Boron Formazanate and Their Application for a Wavelength Converter to Near-Infrared Light

2021 ◽  
Vol 54 (4) ◽  
pp. 1934-1942
Author(s):  
Yuki Kawano ◽  
Yoshinori Ito ◽  
Shunichiro Ito ◽  
Kazuo Tanaka ◽  
Yoshiki Chujo
Keyword(s):  
Near Infrared ◽  
Infrared Light ◽  
Wavelength Converter ◽  
Near Infrared Light ◽  
Conjugated Copolymers

Visible and near-infrared light activated azo dyes

2021 ◽  
Author(s):  
Huijuan Chen ◽  
Weijie Chen ◽  
Yan Lin ◽  
Yuan Xie ◽  
Sheng Hua Liu ◽  
...  
Keyword(s):  
Azo Dyes ◽  
Near Infrared ◽  
Infrared Light ◽  
Near Infrared Light
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