Ground demonstration of an optical control system for a space-based sparse aperture telescope

1998 ◽  
Author(s):  
David B. DeYoung ◽  
James D. Dillow ◽  
Stephen P. Corcoran ◽  
Edwina V. Andrews ◽  
Julius Yellowhair ◽  
...  
Keyword(s):  
Control System ◽  
Optical Control ◽  
Sparse Aperture

Ground demonstration of an optical control system for a space-based sparse-aperture telescope

1998 ◽  
Author(s):  
David B. DeYoung ◽  
James D. Dillow ◽  
Stephen P. Corcoran ◽  
Edwina V. Andrews ◽  
Julius Yellowhair ◽  
...  
Keyword(s):  
Control System ◽  
Optical Control ◽  
Sparse Aperture

A Hybrid Absorption System With Generator Level Optical Control and Variable Flow Rate

2019 ◽  
Author(s):  
Gleidson Souza ◽  
José V. C. Vargas ◽  
Wellington Balmant ◽  
Marcos C. Campos ◽  
Leonardo C. Martinez ◽  
...  
Keyword(s):  
Control System ◽  
Centrifugal Pump ◽  
Flow Rate ◽  
Air Conditioning ◽  
Energy Input ◽  
Waste Heat ◽  
Optical Control ◽  
Working Fluid ◽  
Vapor Compression ◽  
Regenerative Heat

Abstract Current refrigeration and air conditioning systems are mostly based on the vapor compression cycle, which require electrical energy input. Absorption systems have gained new interest due to the possibility of utilizing waste heat as energy input. In addition, the environmental impact generated by such systems is recognized as much smaller than vapor compression systems. Therefore, this work developed and characterized an absorption refrigeration system with an innovative generator level optical control and variable working fluid mass flow rate, with potential for use in industrial, commercial and residential heating, ventilation, air conditioning, and refrigeration (HVAC & R) systems. The system is hybrid, since it was designed to be fed with heat from the burning of different fuels and/or waste heat sources in complementary fashion. The system consists of: a condenser, an evaporator, two expansion valves, two absorbers, a centrifugal pump, a regenerative heat exchanger, a generator, a rectifier, a generator level optical control system, and two liquid accumulators. The developed level control system consists of 3 light Dependent Resistors (LDR) positioned inside a box built around a transparent level meter, and illuminated internally by a low power light bulb. A frequency inverter and a centrifugal pump allow for the working fluid solution inside the generator to be within a safe range for efficient cooling cycle operation. The system measured refrigeration capacity rate was 2.3 TR, which qualifies as a good performance, since the equipment was originally designed for 1 TR.

On-orbit performance of the Hubble Space Telescope optical control system

1993 ◽  
Vol 32 (10) ◽  
pp. 1681
Author(s):  
R. Basedow ◽  
C. Ftaclas ◽  
R. Crout ◽  
A. Nonnenmacher
Keyword(s):  
Control System ◽  
Hubble Space Telescope ◽  
Optical Control ◽  
Space Telescope

H∞ optical control applied to a generator control system

1992 ◽  
Vol 112 (2) ◽  
pp. 83-91 ◽  
Author(s):  
Kei Ohtsuka ◽  
Toshiyuki Taniguchi ◽  
Takayuki Sato ◽  
Sumio Yokokawa ◽  
Yoshiteru Uyeki
Keyword(s):  
Control System ◽  
Optical Control

Contemporary System Of Direct Broadband Optical Monitoring Of Thickness Of Spray Optical Coatings

2020 ◽  
pp. 48-52
Author(s):  
Oleg F. Prosovsky ◽  
Alexander Yu. Budnev ◽  
Dmitry G. Denisov ◽  
Nikolay V. Baryshnikov ◽  
Yuri O. Prosovsky
Keyword(s):  
Control System ◽  
Control Systems ◽  
Optical Filters ◽  
Optical Control ◽  
Spectral Transmission ◽  
Operating Characteristics ◽  
Indirect Control ◽  
New Construction ◽  
Output Characteristics ◽  
Sprayed Coatings

In this article, construction schemes direct and indirect control systems were analyzed, and new construction, providing high operating characteristics for optic filters, was introduced. Authors introduce the original decision for creation modern broadband optic control system. Based on the proposed method, approbation of created system was made, and output characteristics control system – spectral transmission dependencies were introduced as a result. Spectral transmission dependencies of interference optical filters, made with different optical control systems were analyzed. Conclusions and prognoses about further developments of direct broadband optic control system for thickness sprayed coatings were made.

Digital Optical Control System

1988 ◽  
Vol 27 (9) ◽  
Author(s):  
David H. Jordan ◽  
Charles A. Tipton ◽  
Charles E. Christmann ◽  
Nils P. Hochhausler
Keyword(s):  
Control System ◽  
Optical Control
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