scholarly journals Enhanced Static Modulated Fourier Transform Spectrometer for Fast Approximation in Field Application

Molecules ◽  
2021 ◽  
Vol 26 (11) ◽  
pp. 3312
Author(s):  
Ju Yong Cho ◽  
Won Chun Oh ◽  
Won Kweon Jang
Keyword(s):  
Fourier Transform ◽  
Light Emitting Diode ◽  
Spectral Width ◽  
Peak Shift ◽  
Field Application ◽  
Spectral Peak ◽  
Fourier Transform Spectrometer ◽  
Data Sampling ◽  
Light Emitting ◽  
Operating Current

We discuss the data sampling frequency, the spectral resolution, and the limit for non-aliasing in the static modulated Fourier transform spectrometer based on a modified Sagnac interferometer. The measurement was performed in a very short 4 ms, which is applicable for real time field operation. The improved spectrometer characteristics were used to investigate the spectral properties of an InGaAs light emitting diode. In addition, The measured spectral peak was shifted from 6420 cm−1 to 6365 cm−1, as the temperature increased from 25 °C to 40 °C, when the operating current is fixed to be 0.55 A. As the applied current increased from 0.30 A to 0.55 A at room temperature, the spectral width was broadened from 316 cm−1 to 384 cm−1. Compared to the conventional Fourier transform spectrometer, the measured spectral width by the static modulated Fourier transform spectrometer showed a deviation less than 10%, and the spectral peak shift according to the temperature rise showed a difference within 2%.

A Photodiode Array Fourier Transform Spectrometer Based on a Birefringent Interferometer

1986 ◽  
Vol 40 (5) ◽  
pp. 691-695 ◽  
Author(s):  
Takayuki Okamoto ◽  
Satoshi Kawata ◽  
Shigeo Minami
Keyword(s):  
Fourier Transform ◽  
Light Emitting Diode ◽  
Emission Spectra ◽  
Fourier Transform Spectrometer ◽  
Mercury Lamp ◽  
Visible Spectroscopy ◽  
Light Emitting ◽  
Common Path ◽  
Wollaston Prism ◽  
Photodiode Array

A new version of the photodiode array Fourier transform spectrometer for visible spectroscopy is described. In this version, a birefringent interferometer with a Wollaston prism produces a spatial interferogram of the radiation, which is detected by a linear photodiode array. In addition to the merit of having no mechanical moving parts, this spectrometer has the beneficial advantage of the simple and rugged optical setup and alignment due to its common-path and in-line interferometer formation. These advantages lend this spectrometer to field-use applications. Emission spectra of a low-pressure mercury lamp and a light-emitting diode and an absorption spectrum of a didymium glass filter measured by the developed spectrometer are presented.

Achievement of 110-nm-Wide Spectral Width in Monolithic Tunnel-Junction Light-Emitting Diode

2021 ◽  
pp. 1-1
Author(s):  
Man-Fang Huang ◽  
Ya-Hsuan Shih ◽  
Jih-Yuan Chang ◽  
Yen-Lung Huang ◽  
Jinn-Kong Sheu ◽  
...  
Keyword(s):  
Tunnel Junction ◽  
Light Emitting Diode ◽  
Spectral Width ◽  
Light Emitting

Light-emitting-diode Fourier-transform spectroscopy of HD16O between 11200 and 12400 cm-1

2015 ◽  
Author(s):  
L. N. Sinitsa ◽  
V. I. Serdyukov ◽  
E. R. Polovtseva ◽  
A. P. Shcherbakov ◽  
A. D. Bykov ◽  
...  
Keyword(s):  
Fourier Transform ◽  
Light Emitting Diode ◽  
Fourier Transform Spectroscopy ◽  
Light Emitting

scholarly journals Spectroscopy Transmittance by LED Calibration

Sensors ◽  
2019 ◽  
Vol 19 (13) ◽  
pp. 2951 ◽  
Author(s):  
Daniel Carreres-Prieto ◽  
Juan T. García ◽  
Fernando Cerdán-Cartagena ◽  
Juan Suardiaz-Muro
Keyword(s):  
Real Time ◽  
Light Emitting Diode ◽  
Research Work ◽  
Cost Effective ◽  
Spectral Width ◽  
Calibration Procedure ◽  
Pollution Monitoring ◽  
Light Emitting ◽  
Wide Range ◽  
Incandescent Lamps

Local administrations demand real-time and continuous pollution monitoring in sewer networks. Spectroscopy is a non-destructive technique that can be used to continuously monitor quality in sewers. Covering a wide range of wavelengths can be useful for improving pollution characterization in wastewater. Cost-effective and in-sewer spectrophotometers would contribute to accomplishing discharge requirements. Nevertheless, most available spectrometers are based on incandescent lamps, which makes it unfeasible to place them in a sewerage network for real-time monitoring. This research work shows an innovative calibration procedure that allows (Light-Emitting Diode) LED technology to be used as a replacement for traditional incandescent lamps in the development of spectrophotometry equipment. This involves firstly obtaining transmittance values similar to those provided by incandescent lamps, without using any optical components. Secondly, this calibration process enables an increase in the range of wavelengths available (working range) through a better use of the LED’s spectral width, resulting in a significant reduction in the number of LEDs required. Thirdly, this method allows important reductions in costs, dimensions and consumptions to be achieved, making its implementation in a wide variety of environments possible.

Flat-Topped Emission with Spectral Width above 500 nm from InAs/InP Quantum Dot Waveguide Array Light-Emitting Diode

2012 ◽  
Vol 5 (9) ◽  
pp. 092103 ◽  
Author(s):  
Shohei Yoshikawa ◽  
Tomomitsu Saegusa ◽  
Yuto Iwane ◽  
Masayuki Yamauchi ◽  
Kazuhiko Shimomura
Keyword(s):  
Quantum Dot ◽  
Light Emitting Diode ◽  
Spectral Width ◽  
Waveguide Array ◽  
Light Emitting

Optical Studies of Electroluminescent Structures from Porous Silicon

1992 ◽  
Vol 283 ◽  
Author(s):  
J. F. Harvey ◽  
R. A. Lux ◽  
D. C. Morton ◽  
G. F. McLane ◽  
R. Tsu
Keyword(s):  
Porous Silicon ◽  
Quantum Confinement ◽  
Room Temperature ◽  
Light Emitting Diode ◽  
Spectral Peak ◽  
Electrical Excitation ◽  
Silicon Structure ◽  
Electrical Measurements ◽  
Optical Studies ◽  
Light Emitting

ABSTRACTTwo components of the electroluminescence (EL) from porous silicon light emitting diode (LED) devices have been observed. A slower component and a faster component have been identified. The slower component has a spectral peak shifted to the red from the corresponding photoluminescence (PL) spectrum. The faster component has a spectral peak well in the infrared (IR). Optical and electrical measurements of these two components are discussed. The temperature dependence of the two EL components are presented and contrasted. Our measurements demonstrate that the two EL components and the PL result from recombination in different parts of the porous silicon structure. As the temperature is reduced below room temperature the slower EL exhibits a decrease in intensity at relatively high temperatures, suggesting a freeze out of electrical carriers due to quantum confinement, resulting in a much reduced electrical excitation of the EL.

Fourier Transform–Raman and Reflectance Studies on Dental Enamel Bleached with Hydrogen Peroxide Activated Using a Light-Emitting Diode–Laser System

2009 ◽  
Vol 27 (6) ◽  
pp. 913-919 ◽  
Author(s):  
Ilene Cristine Rosia Cesar ◽  
Luís Eduardo Silva Soares ◽  
Leandro Procópio Alves ◽  
Airton Abrahão Martin ◽  
Egberto Munin ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Fourier Transform ◽  
Diode Laser ◽  
Light Emitting Diode ◽  
Laser System ◽  
Dental Enamel ◽  
Light Emitting ◽  
Fourier Transform Raman

scholarly journals РАВНОМЕРНОСТЬ ОСВЕЩЕНИЯ В ПТИЧНИКЕ ПРИ НИЗКОВОЛЬТНОМ ЭЛЕКТРОПИТАНИИ СВЕТОДИОДНЫХ СВЕТИЛЬНИКОВ Гладин Д.В., Кавтарашвили А.Ш.

2021 ◽  
Vol 70 (2) ◽  
Keyword(s):  
Power Supply ◽  
Low Voltage ◽  
Light Emitting Diode ◽  
Scientific Center ◽  
Poultry House ◽  
Light Emitting ◽  
Operating Current ◽  
Lighting Systems ◽  
Academy Of Sciences ◽  
Physical Principles

КЛЮЧЕВЫЕ СЛОВА: НИЗКОВОЛЬТНЫЕ СВЕТОДИОДНЫЕ СВЕТИЛЬНИКИ, СТАБИЛИЗАЦИЯ РАБОЧЕГО ТОКА И СВЕТОВОГО ПОТОКА, РАЗМЕРЫ ПТИЧНИКОВ, РАВНОМЕРНОСТЬ ОСВЕЩЕННОСТИ ПТИЧНИКОВ АННОТАЦИЯ: Изучены физические принципы и технические основы современной организации низковольтного светодиодного освещения в птичниках. Рассмотрены технические решения обеспечения равномерности освещения в птичнике за счет сохранения одинакового светового потока низковольтных светодиодных светильников при их различной удаленности от источников питания. THE UNIFORMITY OF LIGHTING WITHIN A POULTRY HOUSE WITH LOW-VOLTAGE POWER SUPPLY OF LED LAMPS GLADIN D.V.1, KAVTARASHVILI A.SH.2 1 TECHNOSVET GROUP, Ltd 2 Federal Scientific Center “All-Russian Research and Technological Institute of Poultry” of Russian Academy of Sciences The physical principles and technical design of modern LED lighting systems with low-voltage power supply for poultry houses are summarized. The technical decisions providing the uniformity of lighting within a poultry house are described involving the maintenance of uniform luminous power of low-voltage LED lamps mounted at different distances from the power source. Keywords: LOW-VOLTAGE LIGHT-EMITTING DIODE (LED) LAMPS, STABILIZATION OF OPERATING CURRENT AND LUMINOUS POWER, SIZE OF POULTRY HOUSE, UNIFORMITY OF LIGHTING WITHIN POULTRY HOUSE

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