Diffuse reflectance near-infrared spectral image measurement for the field monitoring of agricultural products

2003 ◽  
Author(s):  
I. Hiroaki ◽  
T. Masahiko ◽  
N. Toyonori ◽  
T. Eiji
Keyword(s):  
Diffuse Reflectance ◽  
Near Infrared ◽  
Field Monitoring ◽  
Agricultural Products ◽  
Image Measurement ◽  
Spectral Image ◽  
Infrared Spectral

scholarly journals Estimation of Water Transfer in Woven Fabrics Using Near-Infrared Spectral Image

2004 ◽  
Vol 57 (7) ◽  
pp. T61-T66
Author(s):  
Hiroaki ISHIZAWA ◽  
Toyokazu YOTSUDA ◽  
Hiroyuki KANAI ◽  
Toyonori NISHIMATSU ◽  
Eiji TOBA
Keyword(s):  
Near Infrared ◽  
Woven Fabrics ◽  
Water Transfer ◽  
Spectral Image ◽  
Infrared Spectral

Spectral Effects of Water in the 10,000 to 8000 cm−1 (1000 to 1250 nm) near Infrared Spectral Region. And, Can They Explain Previously Seen Effects of Water in the Spectral Region from 14,000 to 11,500 cm−1 (714 to 870 nm)?

1995 ◽  
Vol 3 (3) ◽  
pp. 143-153 ◽  
Author(s):  
James B. Reeves
Keyword(s):  
Spectral Region ◽  
Diffuse Reflectance ◽  
Near Infrared ◽  
Detailed Examination ◽  
Fourier Transform Spectrometer ◽  
High Moisture ◽  
Mid Infrared ◽  
Infrared Spectral ◽  
And Shifts ◽  
Optic Systems

The spectral region from 10,000 to 8000 cm−1 (1000 to 1250 nm) is often used for high moisture samples and fibre optic systems. The first objective of this work was to determine the effects of water on the spectra of various types of materials in this spectral region. The second objective was to determine the origin/nature of spectral effects/artifacts seen in the spectral region from 14,000 to 11,500 cm−1 (714 to 870 nm) when water was added to gums and proteins (increases in peak intensities and shifts in position due to the presence of water). Spectra were obtained by diffuse reflectance and transmission using a Fourier transform spectrometer. The results showed that the effects seen in the mid-infrared and near infrared from 8000 to 4000 cm−1 (1250 to 2500 nm) were also common in this part of the near infrared (i.e. peak shifts, loss of spectral features etc). Thus, the spectra of crystalline glucose and sucrose, while distinctively different as crystalline solids, were very similar when in solution and changes in the spectra of materials, such as acetone, pyridine and ethanol, were very similar in nature to those previously found in the near infrared from 8000 to 4000 cm−1 (1250 to 2500 nm). Finally, detailed examination of spectra in the region from 10,000 to 8000 or 6000 cm−1 (1000 to 1250 or 1667 nm) did not show any spectral effects similar to those seen in gums and proteins in the 14,000 to 11,500 cm−1 (714 to 870 nm) region. Thus, the nature of these effects is still unknown.

Near-Infrared Spectral Image Analysis of Pork Marbling Based on Gabor Filter and Wide Line Detector Techniques

2014 ◽  
Vol 68 (3) ◽  
pp. 332-339 ◽  
Author(s):  
Hui Huang ◽  
Li Liu ◽  
Michael O. Ngadi ◽  
Claude Gariépy ◽  
Shiv O. Prasher
Keyword(s):  
Image Analysis ◽  
Near Infrared ◽  
Gabor Filter ◽  
Spectral Image ◽  
Infrared Spectral ◽  
Wide Line ◽  
Line Detector

Intensity-Value Corrections for Integrating Sphere Measurements of Solid Samples Measured behind Glass

2014 ◽  
Vol 68 (11) ◽  
pp. 1224-1234 ◽  
Author(s):  
Timothy J. Johnson ◽  
Bruce E. Bernacki ◽  
Rebecca L. Redding ◽  
Yin-Fong Su ◽  
Carolyn S. Brauer ◽  
...  
Keyword(s):  
Diffuse Reflectance ◽  
Near Infrared ◽  
Polished Glass ◽  
Reflectance Spectra ◽  
Integrating Sphere ◽  
Empirical Correction ◽  
Hemispherical Reflectance ◽  
Infrared Spectral ◽  
Reflecting Surfaces

Accurate and calibrated directional-hemispherical reflectance spectra of solids are important for both in situ and remote sensing. Many solids are in the form of powders or granules and to measure their diffuse reflectance spectra in the laboratory, it is often necessary to place the samples behind a transparent medium such as glass for the ultraviolet (UV), visible, or near-infrared spectral regions. Using both experimental methods and a simple optical model, we demonstrate that glass (fused quartz in our case) leads to artifacts in the reflectance values. We report our observations that the measured reflectance values, for both hemispherical and diffuse reflectance, are distorted by the additional reflections arising at the air–quartz and sample–quartz interfaces. The values are dependent on the sample reflectance and are offset in intensity in the hemispherical case, leading to measured values up to ∼6% too high for a 2% reflectance surface, ∼3.8% too high for 10% reflecting surfaces, approximately correct for 40–60% diffuse-reflecting surfaces, and ∼1.5% too low for 99% reflecting Spectralon® surfaces. For the case of diffuse-only reflectance, the measured values are uniformly too low due to the polished glass, with differences of nearly 6% for a 99% reflecting matte surface. The deviations arise from the added reflections from the quartz surfaces, as verified by both theory and experiment, and depend on sphere design. Empirical correction factors were implemented into post-processing software to redress the artifact for hemispherical and diffuse reflectance data across the 300–2300 nm range.

scholarly journals Deviation of white diffuse reflectance standards from perfect reflecting diffuser at visible and near-infrared spectral ranges

Metrologia ◽  
2019 ◽  
Vol 56 (5) ◽  
pp. 055005 ◽  
Author(s):  
B Bernad ◽  
A Ferrero ◽  
C Strothkämper ◽  
J Campos ◽  
A Pons ◽  
...  
Keyword(s):  
Diffuse Reflectance ◽  
Near Infrared ◽  
Infrared Spectral ◽  
Spectral Ranges

Metastructures for the Giant Enhancement of Raman Scattering in the Near Infrared Spectral Range

JETP Letters ◽  
2020 ◽  
Vol 112 (1) ◽  
pp. 31-36
Author(s):  
V. I. Kukushkin ◽  
V. E. Kirpichev ◽  
E. N. Morozova ◽  
V. V. Solov’ev ◽  
Ya. V. Fedotova ◽  
...  
Keyword(s):  
Raman Scattering ◽  
Spectral Range ◽  
Near Infrared ◽  
Infrared Spectral Range ◽  
Infrared Spectral

scholarly journals ALD Deposited ZnO:Al Films on Mica for Flexible PDLC Devices

Nanomaterials ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 1011
Author(s):  
Dimitre Z. Dimitrov ◽  
Zih Fan Chen ◽  
Vera Marinova ◽  
Dimitrina Petrova ◽  
Chih Yao Ho ◽  
...  
Keyword(s):  
Near Infrared ◽  
Atomic Layer ◽  
Optical Transmittance ◽  
Force Microscopy ◽  
Flexible Polymer ◽  
Layer Deposition ◽  
Polymer Dispersed ◽  
Muscovite Mica ◽  
Infrared Spectral ◽  
Continuous Bending

In this work, highly conductive Al-doped ZnO (AZO) films are deposited on transparent and flexible muscovite mica substrates by using the atomic layer deposition (ALD) technique. AZO-mica structures possess high optical transmittance at visible and near-infrared spectral range and retain low electric resistivity, even after continuous bending of up to 800 cycles. Structure performances after bending tests have been supported by atomic force microscopy (AFM) analysis. Based on performed optical and electrical characterizations AZO films on mica are implemented as transparent conductive electrodes in flexible polymer dispersed liquid crystal (PDLC) devices. The measured electro-optical characteristics and response time of the proposed devices reveal the higher potential of AZO-mica for future ITO-free flexible optoelectronic applications.

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