Photonic scanning receiver for wide-range microwave frequency measurement by photonic frequency octupling and in-phase and quadrature mixing

2020 ◽  
Vol 45 (19) ◽  
pp. 5381
Author(s):  
Jingzhan Shi ◽  
Fangzheng Zhang ◽  
Yuewen Zhou ◽  
Shilong Pan ◽  
Yiping Wang ◽  
...  
Keyword(s):  
Microwave Frequency ◽  
Frequency Measurement ◽  
Wide Range ◽  
Frequency Octupling

scholarly journals Wide-range, high-precision multiple microwave frequency measurement using a chip-based photonic Brillouin filter

Optica ◽  
2016 ◽  
Vol 3 (1) ◽  
pp. 30 ◽  
Author(s):  
Hengyun Jiang ◽  
David Marpaung ◽  
Mattia Pagani ◽  
Khu Vu ◽  
Duk-Yong Choi ◽  
...  
Keyword(s):  
High Precision ◽  
Microwave Frequency ◽  
Frequency Measurement ◽  
Wide Range

scholarly journals Aspects of modernization of UA Ч3-101 frequency meter

2020 ◽  
pp. 3-7
Author(s):  
I. I. Krival’ ◽  
A. I. Skripnyuk ◽  
A. V. Rudkovskiy ◽  
V. A. Protsenko ◽  
O. A. Prisyazhnyuk
Keyword(s):  
Frequency Converter ◽  
Reducing Power ◽  
Microwave Frequency ◽  
Frequency Measurement ◽  
Technical Solution ◽  
Reference Frequency ◽  
Similar Frequency ◽  
Wide Range ◽  
Frequency Meter ◽  
Labor Consuming

JSC «Meridian» n. a. S. P. Korolyov at one point developed and mass-produced a wide-range microwave frequency meter of the 8-mm wavelength range UA Ч3-101. Over time, however, the device has become obsolete for a number of reasons, and the question arose of the need to replace it. Since the cost of foreign models of frequency meters with similar parameters available on the market is quite high, the enterprise’s capabilities in solving this issue were considered. The analysis showed that the development of a new similar frequency meter will also be quite expensive, but the modernization of the existing one might be much cheaper, since the enterprise has all the infrastructure for serial production of the upgraded frequency meter. This article describes technical solutions for the replacement of labor-consuming microwave components of the UA Ч3-101 frequency meter, such as microstrip and waveguide input microwave converters, as well as optimization of the frequency measuring process of the input signal, which allowed us to upgrade the device according to the requirements. The use of the developed broadband small-sized frequency converter in the modernized UA Ч3-101A frequency meter made it possible to simplify the circuit and the frequency measurement process as much as possible, to use only one input microwave converter, to significantly reduce the weight and size of the device, to abandon the labor-consuming and expensive waveguide components of the device, and to double the sensitivity upgraded frequency meter. The proposed technical solution allowed simplifying the production process of the frequency meter, making the device more convenient to use. In addition, due to the optimization of circuit and design solutions in the upgraded frequency meter, it was possible to combine the counter and the gate driver on the same board, combine the reference frequency block with a 100 MHz tunable generator, abandon the switch, which allowed reducing power consumption and increasing the reliability of the device.

Instantaneous Microwave Frequency Measurement with Ultra-wide Range and High-resolution Based on Stimulated Brillouin Scattering

2017 ◽  
Vol 46 (12) ◽  
pp. 1226001
Author(s):  
潘林兵 PAN Lin-bing ◽  
姜凌珂 JIANG Ling-ke ◽  
王悦 WANG Yue ◽  
董玮 DONG Wei ◽  
张歆东 ZHANG Xin-dong ◽  
...  
Keyword(s):  
High Resolution ◽  
Brillouin Scattering ◽  
Stimulated Brillouin Scattering ◽  
Microwave Frequency ◽  
Frequency Measurement ◽  
Wide Range ◽  
Stimulated Brillouin

Wide-range, high-accuracy multiple microwave frequency measurement by frequency-to-phase-slope mapping

2020 ◽  
Vol 123 ◽  
pp. 105895
Author(s):  
Di Wang ◽  
Cong Du ◽  
Yuchen Yang ◽  
Weinan Zhou ◽  
Tong Meng ◽  
...  
Keyword(s):  
Microwave Frequency ◽  
Frequency Measurement ◽  
High Accuracy ◽  
Phase Slope ◽  
Wide Range

scholarly journals Photonic approach to microwave frequency measurement with digital circular-code results

2011 ◽  
Vol 19 (21) ◽  
pp. 20580 ◽  
Author(s):  
Xihua Zou ◽  
Wei Pan ◽  
Bin Luo ◽  
Lianshan Yan ◽  
Yushi Jiang
Keyword(s):  
Microwave Frequency ◽  
Frequency Measurement ◽  
Circular Code

scholarly journals Selective 13C labelling reveals the electronic structure of flavocoenzyme radicals

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Erik Schleicher ◽  
Stephan Rein ◽  
Boris Illarionov ◽  
Ariane Lehmann ◽  
Tarek Al Said ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Blue Light ◽  
Density Functional ◽  
Double Resonance ◽  
Density Functional Theory Calculations ◽  
Microwave Frequency ◽  
Fine Tuning ◽  
Electron Nuclear Double Resonance ◽  
Intermediate Radical ◽  
Wide Range

AbstractFlavocoenzymes are nearly ubiquitous cofactors that are involved in the catalysis and regulation of a wide range of biological processes including some light-induced ones, such as the photolyase-mediated DNA repair, magnetoreception of migratory birds, and the blue-light driven phototropism in plants. One of the factors that enable versatile flavin-coenzyme biochemistry and biophysics is the fine-tuning of the cofactor’s frontier orbital by interactions with the protein environment. Probing the singly-occupied molecular orbital (SOMO) of the intermediate radical state of flavins is therefore a prerequisite for a thorough understanding of the diverse functions of the flavoprotein family. This may be ultimately achieved by unravelling the hyperfine structure of a flavin by electron paramagnetic resonance. In this contribution we present a rigorous approach to obtaining a hyperfine map of the flavin’s chromophoric 7,8-dimethyl isoalloxazine unit at an as yet unprecedented level of resolution and accuracy. We combine powerful high-microwave-frequency/high-magnetic-field electron–nuclear double resonance (ENDOR) with 13C isotopologue editing as well as spectral simulations and density functional theory calculations to measure and analyse 13C hyperfine couplings of the flavin cofactor in DNA photolyase. Our data will provide the basis for electronic structure considerations for a number of flavin radical intermediates occurring in blue-light photoreceptor proteins.

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