Design of wideband directional coupler based on secondary stage coupled structure

2021 ◽  
Author(s):  
Dun Wei Liao ◽  
Yun Qi Fu
Keyword(s):  
Directional Coupler ◽  
Secondary Stage

Structured methods for improving flow measurement accuracy in pipelines

2020 ◽  
pp. 30-35
Author(s):  
Gurami N. Akhobadze
Keyword(s):  
Flow Measurement ◽  
Measurement Accuracy ◽  
Directional Coupler ◽  
Signal To Noise Ratio ◽  
Scattered Wave ◽  
Orthogonal Polarization ◽  
Flow Sensors ◽  
Information Signal ◽  
Mass Flows ◽  
Processing Device

In the age of digital transformation of production processes in industry and science the development and design of intelligent flow sensors for granular and liquid substances transferring through pipelines becomes more important. With this in view new approaches for improving the accuracy of microwave flowmeters are proposed. Taking into account the characteristics ofelectromagnetic waves propagating through a pipeline, a wave scattered by inhomogeneities of the controlled medium is analyzed. Features of the transformation of the polarized scattered wave limiting the geometric dimensions of the pipeline and optimizing the values of the useful scattered signal are revealed. Expediency of collection of the information signal with orthogonal polarization of the scattered wave and through a directional coupler is substantiated. The method of estimating the measurement accuracy with reference to the signal-to-noise ratio at the input of the processing device is given. The research results can be used in cryogenic machine engineering to measure volume and mass flows of liquid cryogenic products.

Design and measurement of broadband loop mirror with curved directional coupler based on Si waveguides

2020 ◽  
Vol 59 (11) ◽  
pp. 112002
Author(s):  
Takuya Mitarai ◽  
Eissa Moataz ◽  
Takayuki Miyazaki ◽  
Tomohiro Amemiya ◽  
Nobuhiko Nishiyama
Keyword(s):  
Directional Coupler ◽  
Loop Mirror

Simplified Analysis and Applications of Single Mode Active Directional Coupler with Parallel Electrodes

2009 ◽  
Vol 19 (1) ◽  
pp. 47-62
Author(s):  
Adel l Zaghlou ◽  
Rasheed El-Awady ◽  
Sayed Kamel ◽  
Sohair Mahfouz
Keyword(s):  
Directional Coupler ◽  
Single Mode ◽  
Simplified Analysis

Environmental Impact Evaluation of Istanbul Wastewater Treatment and Marine Disposal Systems

1992 ◽  
Vol 25 (9) ◽  
pp. 85-92 ◽  
Author(s):  
I. Ozturk ◽  
T. Zambal ◽  
A. Samsunlu ◽  
E. Göknel
Keyword(s):  
Water Quality ◽  
Wastewater Treatment ◽  
Environmental Impact ◽  
Quality Parameters ◽  
Sea Of Marmara ◽  
General Evaluation ◽  
Marine Outfall ◽  
Secondary Stage ◽  
Pre Treatment

Metropolitan Istanbul Wastewater Treatment System contains 14 marine outfalls, seven of which include secondary stage biological treatment processes. The others have only mechanical treatment units including bar screens and grit chambers. Only one mechanical pre-treatment and marine disposal system, Yenikapi plant, has been operated since 1988 among these 14 plants and six of them are ready for construction. In this paper, the environmental impact of Yenikapi pretreatment and marine disposal system on the water quality of the Bosphorus and the Sea of Marmara has been investigated. Long term water quality measurements which were performed in pre-and post-dischange applications have been evaluated. Water quality parameters including pH, DO, BODs, TKN, P and total coliforms were measured at various sampling stations around the discharge points. A general evaluation of marine outfall systems to be constructed in the scope of Istanbul wastewater treatment project, on the water quality of the Sea of Marmara and the Bosphorus has been presented.

New structure of optical homodyne receiver utilising a 4×4 fibre directional coupler

1988 ◽  
Vol 24 (19) ◽  
pp. 1212 ◽  
Author(s):  
Xiaopin Zhang ◽  
Zhang Sun ◽  
Peida Ye
Keyword(s):  
Directional Coupler

scholarly journals Low-Loss and Broadband Nonvolatile Phase-Change Directional Coupler Switches

ACS Photonics ◽  
2019 ◽  
Vol 6 (2) ◽  
pp. 553-557 ◽  
Author(s):  
Peipeng Xu ◽  
Jiajiu Zheng ◽  
Jonathan K. Doylend ◽  
Arka Majumdar
Keyword(s):  
Phase Change ◽  
Directional Coupler ◽  
Low Loss
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