Doppler Effect in the multiple-wavelength range-gated active imaging up to relativistic speeds

2022 ◽  
Author(s):  
Alexis Matwyschuk
Keyword(s):  
Wavelength Range ◽  
Doppler Effect ◽  
Multiple Wavelength ◽  
Active Imaging

scholarly journals Multiple Wavelength Optical Coherence Tomography Assessments for Enhanced Ex Vivo Intra-Cochlear Microstructural Visualization

Electronics ◽  
2018 ◽  
Vol 7 (8) ◽  
pp. 133 ◽  
Author(s):  
Sungwook Kim ◽  
Ruchire Wijesinghe ◽  
Jaeyul Lee ◽  
Muhammad Shirazi ◽  
Pilun Kim ◽  
...  
Keyword(s):  
Optical Coherence Tomography ◽  
High Resolution ◽  
Wavelength Range ◽  
Basilar Membrane ◽  
Ex Vivo ◽  
Organ Of Corti ◽  
Depth Range ◽  
Optical Coherence ◽  
Multiple Wavelength ◽  
Multiple Wavelengths

The precise identification of intra-cochlear microstructures is an essential otorhinolaryngological requirement to diagnose the progression of cochlea related diseases. Thus, we demonstrated an experimental procedure to investigate the most optimal wavelength range, which can enhance the visualization of ex vivo intra-cochlear microstructures using multiple wavelengths (i.e., 860 nm, 1060 nm, and 1300 nm) based optical coherence tomography (OCT) systems. The high-resolution tomograms, volumetric, and quantitative evaluations obtained from Basilar membrane, organ of Corti, and scala vestibule regions revealed complementary comparisons between the aforementioned three distinct wavelengths based OCT systems. Compared to 860 nm and 1300 nm wavelengths, 1060 nm wavelength OCT was discovered to be an appropriate wavelength range verifying the simultaneously obtainable high-resolution and reasonable depth range visualization of intra-cochlear microstructures. Therefore, the implementation of 1060 nm OCT can minimize the necessity of two distinct OCT systems. Moreover, the results suggest that the performed qualitative and quantitative analysis procedure can be used as a powerful tool to explore further anatomical structures of the cochlea for future studies in otorhinolaryngology.

1.3-μm waveband multiple-wavelength InAs/InGaAs quantum dot light source for wide wavelength range of 10 Gb/s transmissions over 8-km long holey fiber

2012 ◽  
Author(s):  
Yasuaki Kurata ◽  
Naokatsu Yamamoto ◽  
Kouichi Akahane ◽  
Tetsuya Kawanishi ◽  
Hideyuki Sotobayashi ◽  
...  
Keyword(s):  
Quantum Dot ◽  
Light Source ◽  
Wavelength Range ◽  
Holey Fiber ◽  
Multiple Wavelength ◽  
Wide Wavelength Range

Application of pyrometer and standard sample to determine surface temperature of studied materials

2019 ◽  
pp. 9-13
Author(s):  
V.Ya. Mendeleyev ◽  
V.A. Petrov ◽  
A.V. Yashin ◽  
A.I. Vangonen ◽  
O.K. Taganov
Keyword(s):  
Composite Material ◽  
Surface Temperature ◽  
Relative Error ◽  
Wavelength Range ◽  
Standard Sample ◽  
A Priori ◽  
Temperature Changes ◽  
Surface Temperatures ◽  
Relative Errors ◽  
Normal Emissivity

Determining the surface temperature of materials with unknown emissivity is studied. A method for determining the surface temperature using a standard sample of average spectral normal emissivity in the wavelength range of 1,65–1,80 μm and an industrially produced Metis M322 pyrometer operating in the same wavelength range. The surface temperature of studied samples of the composite material and platinum was determined experimentally from the temperature of a standard sample located on the studied surfaces. The relative error in determining the surface temperature of the studied materials, introduced by the proposed method, was calculated taking into account the temperatures of the platinum and the composite material, determined from the temperature of the standard sample located on the studied surfaces, and from the temperature of the studied surfaces in the absence of the standard sample. The relative errors thus obtained did not exceed 1,7 % for the composite material and 0,5% for the platinum at surface temperatures of about 973 K. It was also found that: the inaccuracy of a priori data on the emissivity of the standard sample in the range (–0,01; 0,01) relative to the average emissivity increases the relative error in determining the temperature of the composite material by 0,68 %, and the installation of a standard sample on the studied materials leads to temperature changes on the periphery of the surface not exceeding 0,47 % for composite material and 0,05 % for platinum.

Results of Spatial Structure of Atmosphere Radiation in a Spectral Range (1.5–2) µm Research

2018 ◽  
pp. 7-13
Author(s):  
Anton M. Mishchenko ◽  
Sergei S. Rachkovsky ◽  
Vladimir A. Smolin ◽  
Igor V . Yakimenko
Keyword(s):  
Spatial Structure ◽  
Unmanned Aerial Vehicle ◽  
Wavelength Range ◽  
Spectral Range ◽  
Near Ir ◽  
Optoelectronic Systems ◽  
Aerial Vehicle

Results of experimental studying radiation spatial structure of atmosphere background nonuniformities and of an unmanned aerial vehicle being the detection object are presented. The question on a possibility of its detection using optoelectronic systems against the background of a cloudy field in the near IR wavelength range is also considered.

Some notes on the relativistic Doppler effect

1998 ◽  
Vol 168 (9) ◽  
pp. 1037 ◽  
Author(s):  
Yu.I. Hovsepyan
Keyword(s):  
Doppler Effect
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