Strategies for noise reduction of a dual-frequency VECSEL dedicated to cesium CPT clocks

2018 ◽  
Author(s):  
Gregory Gredat ◽  
Hui Liu ◽  
Ghaya Baili ◽  
Francois Gutty ◽  
Fabienne Goldfarb ◽  
...  
Keyword(s):  
Noise Reduction ◽  
Dual Frequency

Phase noise reduction by using dual-frequency laser in coherent detection

2016 ◽  
Vol 80 ◽  
pp. 169-175 ◽  
Author(s):  
Zheng Zheng ◽  
Zhao Changming ◽  
Zhang Haiyang ◽  
Yang Suhui ◽  
Zhang Dehua ◽  
...  
Keyword(s):  
Noise Reduction ◽  
Phase Noise ◽  
Coherent Detection ◽  
Dual Frequency ◽  
Frequency Laser

scholarly journals Dual-frequency laser Doppler velocimeter for speckle noise reduction and coherence enhancement

2012 ◽  
Vol 20 (18) ◽  
pp. 20255 ◽  
Author(s):  
Chih-Hao Cheng ◽  
Chia-Wei Lee ◽  
Tzu-Wei Lin ◽  
Fan-Yi Lin
Keyword(s):  
Noise Reduction ◽  
Speckle Noise ◽  
Laser Doppler ◽  
Laser Doppler Velocimeter ◽  
Dual Frequency ◽  
Frequency Laser ◽  
Speckle Noise Reduction

Intensity Noise Reduction of Dual-Frequency Nd:YAG Lasers

2012 ◽  
Author(s):  
S. De ◽  
A. El Amili ◽  
G. Loas ◽  
S. Schwartz ◽  
G. Feugnet ◽  
...  
Keyword(s):  
Noise Reduction ◽  
Intensity Noise ◽  
Dual Frequency ◽  
Nd:Yag Lasers

Satisfaction With Noise Reduction Circuits

1993 ◽  
Vol 2 (1) ◽  
pp. 51-53 ◽  
Author(s):  
Ruth A. Bentler
Keyword(s):  
Noise Reduction

КОНЦЕПЦІЯ СТВОРЕННЯ СИЛОВОЇ УСТАНОВКИ СІМЕЙСТВА РЕГІОНАЛЬНИХ ПАСАЖИРСЬКИХ ЛІТАКІВ АН-148/АН-158

2019 ◽  
pp. 50-63
Author(s):  
О. Д. Донець ◽  
В. П. Іщук
Keyword(s):  
Power Plant ◽  
Noise Reduction ◽  
Fuel Consumption ◽  
Electronic System ◽  
Electronic Control ◽  
Level Of Automation ◽  
Auxiliary Power ◽  
Power Plant Control ◽  
Technical Status ◽  
Air Intake

The basic results of calculation and research works carried out in the process of creation of power unit of regional passenger airplanes’ family are given. The design features of the propulsion engines and engine of the auxiliary power plant are described. The aforementioned propulsion system includes propulsion engines D-436-148 and engine AI-450-MS of auxiliary power plant. In order to comply with the requirements of Section 4 of the ICAO standard (noise reduction of the aircraft in site), in part of ensuring the noise reduction of engines, when creating the power plant of the An-148/An-158 aircraft family, a single- and double-layer acoustic filler was used in the structure of the engine nacelle and air intake. The use of electronic system for automatic control of propulsion engines such as FADEC and its integration into the digital airborne aircraft complex ensured the operation of engines, included in the power plant provided with high specific fuel consumption, as well as increased the level of automation of the power plant control and monitoring, and ensured aircraft automation landing in ICAO category 3A. In addition, the use of the aforementioned electronic system, allowed to operate the power plant of the aircraft in accordance with technical status. The use of the AI-450-MS auxiliary power plant with an electronic control system such as FADEC, and the drive of the service compressor from a free turbine, eliminated the effect of changes in power and air takeoff, on the deviation of the engine from optimal mode, which also minimized the fuel consumption. The use of fuel metering system TIS-158, allowed to ensure control of its condition and assemblies, without the use of auxiliary devices, built-in control means. In the fire protection system, the use of the electronic control and monitor unit, as well as the use of digital serial code for the exchange of information between the elements of the system and the aircraft systems, has reduced the number of connections, which increased the reliability of the system and reduced its weight characteristics.

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