scholarly journals Optical system design of multispectral video camera for 8-14 microns range

2021 ◽  
Vol 2127 (1) ◽  
pp. 012071
Author(s):  
S M Neverov
Keyword(s):  
Optical System ◽  
Far Infrared ◽  
Video Camera ◽  
Infrared Range ◽  
Optical Scheme ◽  
Actual Problem ◽  
Industrial Sites ◽  
Light Filters ◽  
Spectral Ranges ◽  
Multispectral Camera

Abstract To solve the actual problem of determining the composition of a gas mixture in an uncontrolled leak at industrial sites, it is proposed to use a multispectral camera that allows you to simultaneously form several spectral images on a bolometric matrix. This method will provide visualization of the gas cloud in the far infrared range from 8 to 14 micrometers with selection by chemical composition. The article proposes an optical scheme for simultaneous registration of images in eight narrow spectral ranges of wavelengths, as well as the design of its elements for a bolometric matrix with a resolution of 640x480 pixels: a lens, a raster, and light filters using the ZEMAX application software package. As a result of the design, a low F-number three-lens optical system for a necessary field of view and a raster with a block of light filters are obtained, forming sixteen images in different spectral ranges. Thus, we solved an issue of design an optical system with minimal aberrations for a multispectral camera.

Performance of the far-IR beamline of the 6 MeV tabletop synchrotron light source

2009 ◽  
Vol 16 (2) ◽  
pp. 299-306 ◽  
Author(s):  
Md. Monirul Haque ◽  
Hironari Yamada ◽  
Ahsa Moon ◽  
Mami Yamada
Keyword(s):  
Light Source ◽  
Optical System ◽  
Far Infrared ◽  
Beam Current ◽  
Small Ring ◽  
Thermal Source ◽  
Simulation Code ◽  
Dynamic Aperture ◽  
Electron Orbit ◽  
Synchrotron Light

The performance of the far-infrared (FIR) beamline of the 6 MeV tabletop synchrotron light source MIRRORCLE-6FIR dedicated to far-infrared spectroscopy is presented. MIRRORCLE-6FIR is equipped with a perfectly circular optical system (PhSR) placed around the 1 m-long circumference electron orbit. To illustrate the facility of this light source, the FIR output as well as its spectra were measured. The optimum optical system was designed by using the ray-tracing simulation code ZEMAX. The measured FIR intensity with the PhSR in place is about five times higher than that without the PhSR, which is in good agreement with the simulation results. The MIRRORCLE-6FIR spectral flux is compared with a standard thermal source and is found to be 1000 times greater than that from a typical thermal source at ∼15 cm−1. It is also observed that the MIRRORCLE-6FIR radiation has a highly coherent nature. The broadband infrared allows the facility to reach the spectral range from 10 cm−1 to 100 cm−1. MIRRORCLE-6FIR, owing to a large beam current, the PhSR mirror system, a large dynamic aperture and small ring energy, can deliver a bright flux of photons in the FIR/THz region useful for broadband spectroscopy.

Polarization-Sensitive Fourier-Transform Spectroscopy of HgTe/CdHgTe Quantum Wells in the Far Infrared Range in a Magnetic Field

JETP Letters ◽  
2018 ◽  
Vol 108 (5) ◽  
pp. 329-334 ◽  
Author(s):  
L. S. Bovkun ◽  
A. V. Ikonnikov ◽  
V. Ya. Aleshkin ◽  
S. S. Krishtopenko ◽  
N. N. Mikhailov ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Fourier Transform ◽  
Quantum Wells ◽  
Far Infrared ◽  
Fourier Transform Spectroscopy ◽  
Infrared Range

Dielectric dispersion of (NH4)2SO4in the near-millimetre and far-infrared range: manifestations of disorder

1988 ◽  
Vol 21 (28) ◽  
pp. 4883-4894 ◽  
Author(s):  
G V Kozlov ◽  
S P Lebedev ◽  
A A Volkov ◽  
J Petzelt ◽  
B Wyncke ◽  
...  
Keyword(s):  
Far Infrared ◽  
Dielectric Dispersion ◽  
Infrared Range

Au25: A Tip-enhanced, Spinning Top - Core-Shell? The Brightest Molecular Super Star Among the Nanoclusters, Au21-25(C1)

2020 ◽  
Author(s):  
K. Vishwanathan
Keyword(s):  
Vibrational Frequency ◽  
Hessian Matrix ◽  
Far Infrared ◽  
Positive Semidefinite ◽  
Core Shell ◽  
Bending Vibrations ◽  
Optimization Study ◽  
Single State ◽  
Spectral Ranges ◽  
Spinning Top

Abstract The geometries and vibrational frequency of the stable AuN clusters with N = 21 to 25 are presented through the global structure re-optimization study. The finite-differentiation method has been implemented within the density-functionaltight-binding (DFTB) approach. The effect of the range of interatomic forces was calculated and the desired set of system eigenfrequencies (3N-6) is obtained by diagonalization of the symmetric positive semidefinite Hessian matrix. We have observed the vibrational spectral ranges of between 2.88 and 328.25 cm-1 Δ E=0, and even the minute details of the very lower frequencies were occupied in some clusters at the beginning of NVM itself which comes even below the scale of Far Infrared FIR, IR-C 200-10 cm-1. Significantly, some of the clusters spectrums are with double state degeneracy and the rest of them are having single state degeneracy. Nevertheless, our investigation has revealed that the vibrational spectrum strongly depends upon the size, shape, and structure, as well as, stretching and bending vibrations of the atoms.

Construction of dimetal-containing dithiolene and Schiff base conjugated polymer coating: exploiting metal coordination as a design strategy for improving infrared stealth properties

2019 ◽  
Vol 10 (43) ◽  
pp. 5839-5848 ◽  
Author(s):  
Jingwen Cai ◽  
Jianhua Han ◽  
Guojia Ma ◽  
Xing Liu ◽  
Jinyan Wang ◽  
...  
Keyword(s):  
Schiff Base ◽  
Conjugated Polymer ◽  
Polymer Coating ◽  
Near Infrared ◽  
Far Infrared ◽  
Design Strategy ◽  
Polymer Coatings ◽  
Metal Coordination ◽  
Infrared Range

Dimetal-containing dithiolene and Schiff base conjugated polymer coatings are constructed and exhibit excellent stealth abilities in the NIR (near-infrared) and MFIR (mid–far-infrared) range.

scholarly journals Can downwelling far-infrared radiances over Antarctica be estimated from mid-infrared information?

2019 ◽  
Vol 19 (11) ◽  
pp. 7927-7937
Author(s):  
Christophe Bellisario ◽  
Helen E. Brindley ◽  
Simon F. B. Tett ◽  
Rolando Rizzi ◽  
Gianluca Di Natale ◽  
...  
Keyword(s):  
Climate Models ◽  
Far Infrared ◽  
Mid Infrared ◽  
Spectral Bands ◽  
Noise Characteristics ◽  
Infrared Spectral ◽  
Infrared Radiances ◽  
Spectrally Resolved ◽  
Spectral Ranges ◽  
The Impact

Abstract. Far-infrared (FIR: 100cm-1<wavenumber, ν<667 cm−1) radiation emitted by the Earth and its atmosphere plays a key role in the Earth's energy budget. However, because of a lack of spectrally resolved measurements, radiation schemes in climate models suffer from a lack of constraint across this spectral range. Exploiting a method developed to estimate upwelling far-infrared radiation from mid-infrared (MIR: 667cm-1<ν<1400 cm−1) observations, we explore the possibility of inferring zenith FIR downwelling radiances in zenith-looking observation geometry, focusing on clear-sky conditions in Antarctica. The methodology selects a MIR predictor wavenumber for each FIR wavenumber based on the maximum correlation seen between the different spectral ranges. Observations from the REFIR-PAD instrument (Radiation Explorer in the Far Infrared – Prototype for Application and Development) and high-resolution radiance simulations generated from co-located radio soundings are used to develop and assess the method. We highlight the impact of noise on the correlation between MIR and FIR radiances by comparing the observational and theoretical cases. Using the observed values in isolation, between 150 and 360 cm−1, differences between the “true” and “extended” radiances are less than 5 %. However, in spectral bands of low signal, between 360 and 667 cm−1, the impact of instrument noise is strong and increases the differences seen. When the extension of the observed spectra is performed using regression coefficients based on noise-free radiative transfer simulations the results show strong biases, exceeding 100 % where the signal is low. These biases are reduced to just a few percent if the noise in the observations is accounted for in the simulation procedure. Our results imply that while it is feasible to use this type of approach to extend mid-infrared spectral measurements to the far-infrared, the quality of the extension will be strongly dependent on the noise characteristics of the observations. A good knowledge of the atmospheric state associated with the measurements is also required in order to build a representative regression model.

A MODEL FOR OPTICAL ABSORPTION OF AMORPHOUS GaAs IN THE FAR-INFRARED RANGE BY USING AN OPERATIONAL TECHNIQUE

1999 ◽  
Vol 13 (25) ◽  
pp. 919-923 ◽  
Author(s):  
M. A. GRADO-CAFFARO ◽  
M. GRADO-CAFFARO
Keyword(s):  
Optical Absorption ◽  
Absorption Coefficient ◽  
Far Infrared ◽  
Structural Disorder ◽  
Optical Absorption Coefficient ◽  
Infrared Range ◽  
Phonon Density ◽  
Phonon Density Of States ◽  
Operational Technique ◽  
Dynamical Disorder

By considering a sample of amorphous GaAs with a small zone of dynamical disorder, an expression for the optical absorption coefficient and phonon density of states in the low region of the far-infrared range is obtained. To get to this end, absorption corresponding to structural disorder is neglected.

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