Evolution of an Optical Control System for Aircraft Hydraulics

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.

Download Full-text

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

10.1117/12.324516 ◽

1998 ◽

Cited By ~ 4

Author(s):

David B. DeYoung ◽

James D. Dillow ◽

Stephen P. Corcoran ◽

Edwina V. Andrews ◽

Julius Yellowhair ◽

...

Keyword(s):

Control System ◽

Optical Control ◽

Sparse Aperture

Download Full-text

Optical control system for millimeter-wave phased-array antennas

10.1117/12.163584 ◽

1993 ◽

Author(s):

Nabeel A. Riza

Keyword(s):

Control System ◽

Millimeter Wave ◽

Phased Array ◽

Optical Control ◽

Phased Array Antennas ◽

Array Antennas

Download Full-text

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

Applied Optics ◽

10.1364/ao.32.001681 ◽

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

Download Full-text

H∞ optical control applied to a generator control system

Electrical Engineering in Japan ◽

10.1002/eej.4391120209 ◽

1992 ◽

Vol 112 (2) ◽

pp. 83-91 ◽

Cited By ~ 2

Author(s):

Kei Ohtsuka ◽

Toshiyuki Taniguchi ◽

Takayuki Sato ◽

Sumio Yokokawa ◽

Yoshiteru Uyeki

Keyword(s):

Control System ◽

Optical Control

Download Full-text

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

Light & Engineering ◽

10.33383/2020-017 ◽

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.

Download Full-text