Spectral reflection coefficients of bodies when cooling down

1971 ◽  
Vol 15 (1) ◽  
pp. 926-928 ◽  
Author(s):  
G. V. Myakin
Keyword(s):  
Reflection Coefficients ◽  
Spectral Reflection

Spectral reflection coefficients of water and of water solutions of several salts. II

1974 ◽  
Vol 17 (6) ◽  
pp. 852-854
Author(s):  
D. I. Kalinenko ◽  
P. N. Kokhanenko ◽  
V. K. Sonchik
Keyword(s):  
Reflection Coefficients ◽  
Water Solutions ◽  
Spectral Reflection

scholarly journals MEASUREMENT OF THE SPECTRAL REFLECTION COEFFICIENTS FOR SURFACES UNDER A MULTISPECTRAL AERIAL SURVEY BY DIGITAL CAMERA

2019 ◽  
Vol 8 ◽  
pp. 279-285
Author(s):  
Stanislav Arbuzov ◽  
Evgenij Gritskevich ◽  
Darja Michaylova ◽  
Anna Selezneva
Keyword(s):  
Unmanned Aerial Vehicles ◽  
Digital Camera ◽  
Aerial Survey ◽  
Field Of View ◽  
Reflection Coefficients ◽  
Digital Cameras ◽  
Agricultural Lands ◽  
Instrument Making ◽  
Spectral Reflection ◽  
Aerial Vehicles

Monitoring of the environment with the help of unmanned aerial vehicles is currently one of the most developing branches of optoelectronic instrument-making. Digital cameras installed on these devices make it possible to survey the underlying surface in order to select the its features. The use of unmanned aerial vehicles for the control of agricultural lands is a very perspective case of such monitoring. The technique of measuring the spectral reflection coefficients of surfaces is developed for identification of the vegetation state observed in the field of view of multispectral digital camera. The method allows determining the spectral reflectance of the calibration surfaces using the reference ones and after that to find the parameters of working surfaces using the calibration ones. The obtained results are applied under the analysis and processing of images obtained in the course of the unmanned aviation system that monitors agricultural lands.

Spectral reflection coefficients of water and of water solutions of several salts. I

1974 ◽  
Vol 17 (6) ◽  
pp. 849-851
Author(s):  
D. I. Kalinenko ◽  
P. N. Kokhanenko ◽  
V. K. Sonchik
Keyword(s):  
Reflection Coefficients ◽  
Water Solutions ◽  
Spectral Reflection

A UHF Compact Complex Impedance-transforming Balun with High Isolation

2020 ◽  
Vol 13 (8) ◽  
pp. 1135-1144
Author(s):  
Kittipong Nithiporndecha ◽  
Chatrpol Pakasiri
Keyword(s):  
Complex Impedance ◽  
Output Port ◽  
Reflection Coefficients ◽  
Coupled Line ◽  
High Isolation ◽  
Line Structure ◽  
Source Impedance ◽  
Phase Balance ◽  
High Output

Background: A compact complex impedance-transforming balun for UHF frequencies, which is based on a coupled-line structure that matched all ports and provided high output port isolation, was designed in this paper. Methods: A lumped component transformation was used to minimize circuit size. The implemented circuit operated at 433 MHz with the reflection coefficients less than -16 dB at all ports, 0.22 dB amplitude balance and 180° phase balance at the output ports. The signal coupling between the output ports was -16.8 dB. The circuit size is small at 0.032λ. Results: Complex impedance-transforming baluns were designed to operate at 433 MHz. The source impedance at port 1 was set at Zs = 12 - j12Ω and the load impedances at port 2 and 3 were set at ZL = 80 + j30Ω. Conclusion: A compact complex impedance-transforming balun at UHF frequency, with all ports matched and high isolations, was designed and illustrated in this paper.

Comparison of surface-wave reflection coefficients for different metals on quartz

1973 ◽  
Vol 9 (21) ◽  
pp. 495 ◽  
Author(s):  
R. Larosa ◽  
C.F. Vasile ◽  
D.V. Zagardo
Keyword(s):  
Surface Wave ◽  
Wave Reflection ◽  
Reflection Coefficients

scholarly journals Terahertz Portable Handheld Spectral Reflection (PHASR) Scanner

IEEE Access ◽  
2020 ◽  
Vol 8 ◽  
pp. 228024-228031
Author(s):  
Zachery B. Harris ◽  
Mahmoud E. Khani ◽  
M. Hassan Arbab
Keyword(s):  
Spectral Reflection

scholarly journals Transmission, Reflection and Dissipation of Microwaves in Magnetic Composites with Nanocrystalline Finemet-Type Flakes

Materials ◽  
2021 ◽  
Vol 14 (13) ◽  
pp. 3499
Author(s):  
Anatoly B. Rinkevich ◽  
Dmitry V. Perov ◽  
Yuriy I. Ryabkov
Keyword(s):  
Composite Material ◽  
Microwave Absorption ◽  
Nanocrystalline Alloy ◽  
Reflection Coefficients ◽  
Magnetic Composites ◽  
Transmission And Reflection Coefficients ◽  
Wave Interference ◽  
Microwave Losses ◽  
Frequency Dependences ◽  
Transmission And Reflection

The microwave properties of a composite material containing flakes of finemet-type nanocrystalline alloy placed in the epoxy matrix have been investigated. Two compositions have been studied: with 15% and 30% flakes. Frequency dependences of transmission and reflection coefficients are measured in the frequency range from 12 to 38 GHz. The dielectric permittivity and magnetic permeability are obtained, and the microwave losses are calculated. The dependences of transmission and reflection coefficients have been drawn as functions of wave frequency and thickness of the composite material, taking into account the frequency dependences of permittivity and permeability. The regions of maximal and minimal microwave absorption have been defined. The influence of wave interference on the frequency dependence of microwave absorption is studied.

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