Illuminating the optical properties of an LED-based spectral light source for hyperspectral endoscopy

2021 ◽  
Author(s):  
Craig M. Browning ◽  
Marina Parker ◽  
Thomas Rich ◽  
Silas J. Leavesley
Keyword(s):  
Optical Properties ◽  
Light Source

scholarly journals Author Correction: Crystal structure and optical properties of a high-density InGaN nanoumbrella array as a white light source without phosphors

2021 ◽  
Vol 13 (1) ◽  
Author(s):  
Tetsuya Kouno ◽  
Masaru Sakai ◽  
Katsumi Kishino ◽  
Akihiko Kikuchi ◽  
Naoki Umehara ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Optical Properties ◽  
Light Source ◽  
White Light ◽  
High Density ◽  
White Light Source

A Correction to this paper has been published: https://doi.org/10.1038/s41427-021-00298-9

scholarly journals Crystal structure and optical properties of a high-density InGaN nanoumbrella array as a white light source without phosphors

2016 ◽  
Vol 8 (7) ◽  
pp. e289-e289 ◽  
Author(s):  
Tetsuya Kouno ◽  
Masaru Sakai ◽  
Katsumi Kishino ◽  
Akihiko Kikuchi ◽  
Naoki Umehara ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Optical Properties ◽  
Light Source ◽  
White Light ◽  
High Density ◽  
White Light Source

scholarly journals A novel method for the absolute end-to-end calibration of the Auger fluorescence telescopes

2019 ◽  
Vol 210 ◽  
pp. 05013
Author(s):  
Hermann-Josef Mathes
Keyword(s):  
Optical Properties ◽  
Light Source ◽  
Two Dimensions ◽  
Integrating Sphere ◽  
Fluorescence Detector ◽  
Optical Components ◽  
Fluorescence Light ◽  
Novel Method ◽  
End To End

The fluorescence detector technique is using the atmosphere as a calorimeter. Besides the precise monitoring of the parameters of the atmosphere a proper knowledge of the optical properties in the UV range of all optical components involved in the measurements of the fluorescence light is vital. Until now, the end-to-end calibration was performed with a 4.5 m2 large, uniformly lit light source attached to the aperture of the telescopes. To improve the maintainability we propose an alternative setup where a small and lightweight light source of known optical properties re-samples the measurement of the big light source piece by piece. This will be achieved by moving the light source based on an integrating sphere in two dimensions in front of the aperture. A prototype setup has been installed and we are currently optimizing the parameters of the system and the procedures. The aim is to reduce the effort for the procedure without diminishing the quality of the measurement. First measurements with this setup have already been performed and the measurements of the geometrical and optical properties of the light source are an ongoing activity. We present our calibration scheme and the first, preliminary results.

scholarly journals Photoacoustic and nephelometric spectroscopy of aerosol optical properties with a supercontinuum light source

2013 ◽  
Vol 6 (12) ◽  
pp. 3501-3513 ◽  
Author(s):  
N. Sharma ◽  
I. J. Arnold ◽  
H. Moosmüller ◽  
W. P. Arnott ◽  
C. Mazzoleni
Keyword(s):  
Optical Properties ◽  
Light Source ◽  
Wavelength Dependence ◽  
Common Salt ◽  
Design Development ◽  
Aerosol Optical Properties ◽  
Scattering Coefficients ◽  
Aerosol Absorption ◽  
Multi Wavelength

Abstract. A novel multi-wavelength photoacoustic-nephelometer spectrometer (SC-PNS) has been developed for the optical characterization of atmospheric aerosol particles. This instrument integrates a white light supercontinuum laser with photoacoustic and nephelometric spectroscopy to measure aerosol absorption and scattering coefficients at five wavelength bands (centered at 417, 475, 542, 607, and 675 nm). These wavelength bands are selected from the continuous spectrum of the laser (ranging from 400–2200 nm) using a set of optical interference filters. Absorption and scattering measurements on laboratory-generated aerosol samples were performed sequentially at each wavelength band. To test the instrument we measured the wavelength dependence of absorption and scattering coefficients of kerosene soot and common salt aerosols. Results were favorably compared to those obtained with a commercial 3-wavelength photoacoustic and nephelometer instrument demonstrating the utility of the SC light source for studies of aerosol optical properties at selected wavelengths. Here, we discuss instrument design, development, calibration, performance and experimental results.

Multiband Techniques of LED and UV Materials on Visualization of Needle Marks

2012 ◽  
Vol 463-464 ◽  
pp. 1382-1386 ◽  
Author(s):  
Li Jun Wang ◽  
Dai Qin Tao ◽  
Zhi Yong Yin ◽  
Hui Zhao
Keyword(s):  
Image Processing ◽  
Optical Properties ◽  
Spectral Analysis ◽  
Power Consumption ◽  
Light Source ◽  
Material Properties ◽  
Uv Fluorescence ◽  
Light Waves ◽  
Multi Wavelength ◽  
The Right

Critical optical techniques on visualization and extraction about needle marks have been developed based on the material properties of the speedometer. It has developed the multi-band waves and special image processing to do multi-spectral analysis on the suspected needle marks locations. The in-depth discussion has been taken especially for UV fluorescence traces, and alternatives have been established for multi-spectral laser with the multi-wavelength LED light source. Issues have been solved such as size and power consumption to meet the needs of image acquisition and processing. It should choose the right light waves based on the optical properties for various materials of the needle and the gauge plate.

A Diffusive Light Source for Quantification of Optical Properties of Superficial Layers

2004 ◽  
Author(s):  
Sheng-Hao Tseng ◽  
Carole Hayakawa ◽  
Jerome Spanier ◽  
Bruce J. Tromberg ◽  
Anthony J. Durkin
Keyword(s):  
Optical Properties ◽  
Light Source
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