Complex transmission coefficient of a multimode waveguide excited by a semiconductor laser

1991 ◽  
Vol 34 (10) ◽  
pp. 1012-1015
Author(s):  
S. M. Zhminchenko ◽  
V. L. Nazarov ◽  
N. N. Sebekina
Keyword(s):  
Semiconductor Laser ◽  
Transmission Coefficient ◽  
Multimode Waveguide ◽  
Complex Transmission

scholarly journals Development of a direct penetrating signal compensator in a distributed reception channel of a surveillance radar

2021 ◽  
Vol 2 (9 (110)) ◽  
pp. 16-26
Author(s):  
Hennadii Khudov ◽  
Serhii Yarosh ◽  
Oleksandr Droban ◽  
Oleksandr Lavrut ◽  
Yurii Hulak ◽  
...  
Keyword(s):  
Transmission Coefficient ◽  
Matched Filter ◽  
Direct Method ◽  
General Structure ◽  
Main Channel ◽  
Signal Amplifier ◽  
Direct Penetration ◽  
Reception Channel ◽  
Weighting Coefficients ◽  
Complex Transmission

General structure of a compensator of a direct penetrating signal in the diversed reception channel was developed. It is advisable to use the antenna and the receiver of the auxiliary diverted reception channel as an auxiliary antenna and an auxiliary channel. To be able to suppress the penetrating signal in the band of the receiving device of the surveillance radar, distance between the antennas should be up to 6 m. In general, the compensator of the penetrating signals should contain an adder in which the signals received by the main channel are added with the signals received by the auxiliary channel and sent through the amplifier with a corresponding complex transmission coefficient. The direct penetration signal compensator features the obligatory condition of adjusting the value of the complex transmission coefficient of the auxiliary channel signal amplifier. The direct penetration signal compensator is digital and uses the direct method of forming weighting coefficients without the use of feedback. To reduce the time of formation of weighting coefficients when using direct methods of calculation of the correlation matrix, the technology of parallel computational processes was used. The quality of operation of the direct penetrating signal suppression system in the diverted reception channel was evaluated. It was established that without the use of suppression of direct penetrating signals, their powerful response at the output of the matched filter mask weak echo signals. When using a direct penetrating signal in the main channel of the compensator, its response at the output of the matched filter is significantly reduced. This makes it possible to observe weak echoes against the background of a strong penetrating signal. The use of the developed direct penetrating signal compensator provides suppression of the direct penetrating signal from 57 dB to 70 dB

Numerical reconstruction of an object image using an X-ray dynamical diffraction Fraunhofer hologram

2013 ◽  
Vol 21 (1) ◽  
pp. 127-130 ◽  
Author(s):  
Minas K. Balyan
Keyword(s):  
Transmission Coefficient ◽  
Analytical Approximation ◽  
Object Image ◽  
Resolution Limit ◽  
Dynamical Diffraction ◽  
X Ray ◽  
Numerical Reconstruction ◽  
Complex Transmission ◽  
Amplitude Transmission

A numerical method of reconstruction of an object image using an X-ray dynamical diffraction Fraunhofer hologram is presented. Analytical approximation methods and numerical methods of iteration are discussed. An example of a reconstruction of an image of a cylindrical beryllium wire is considered. The results of analytical approximation and zero-order iteration coincide with exact values of the amplitude complex transmission coefficient of the object as predicted by the resolution limit of the scheme, except near the edges of the object. Calculations of the first- and second-order iterations improve the result at the edges of the object. This method can be applied for determination of the complex amplitude transmission coefficient of amplitude as well as phase objects. It can be used in X-ray microscopy.

scholarly journals A modified reciprocal equation to predict the complex transmission coefficient of a flow duct

AIP Advances ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 095001
Author(s):  
Lianyun Liu ◽  
Xu Zheng ◽  
Zhiyong Hao ◽  
Yi Qiu
Keyword(s):  
Transmission Coefficient ◽  
Reciprocal Equation ◽  
Complex Transmission ◽  
Flow Duct
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