SOLID STATE OXYGEN COMPRESSOR FOR JOULE-THOMMPSON CRYOCOOLERS

Award Information
Agency:
Department of Defense
Branch
Missile Defense Agency
Amount:
$320,000.00
Award Year:
1988
Program:
SBIR
Phase:
Phase II
Contract:
n/a
Award Id:
5630
Agency Tracking Number:
5630
Solicitation Year:
n/a
Solicitation Topic Code:
n/a
Solicitation Number:
n/a
Small Business Information
921 Eastwind Dr - Ste 110, Westerville, OH, 43081
Hubzone Owned:
N
Minority Owned:
N
Woman Owned:
N
Duns:
n/a
Principal Investigator:
W N Lawless
(614) 882-2231
Business Contact:
() -
Research Institution:
n/a
Abstract
THE SIGNAL-TO-NOISE RATIO OF INFRARED DETECTORS INCREASES DRAMATICALLYAS THE TEMPERATURE OF THE DETECTOR IS REDUCED TO CRYOGENIC TEMPERATURES AND THERE HAS BEEN A SUBSTANTIAL IMPROVEMENT IN CRYOCOOLERS TO MEET THIS NEED. HOWEVER, VALVES OF ONE TYPE OF CRYOCOOLER, THE JOULE-THOMPSON EXPANSION CRYOCOOLER, ARE PRONE TO PLUGGING BY THE FREEZING OF IMPURITIES IN THE HIGH-PRESSURE STREAM. TO ADDRESS THIS PROBLEM, A RADICAL APPROACH FOR PROVIDING A HIGH-PRESSURE GAS STREAM OF 100% PURE OXYGEN TO A JOULE-THOMPSON EXPANSION DEVICE IS BEING INVESTIGATED. THE COMPRESSOR, A MONOLITHIC SOLID-STATE DEVICE CONTAINING NO MOVING PARTS, IS BASED ON THE SELECTIVE TRANSPORT OF OXYGEN IONS THROUGH A CERAMIC OXYGEN IONIC CONDUCTOR UNDER AN APPLIED VOLTAGE. ELEMENTARY CONSIDERATIONS SHOW THAT THE CERAMIC STRUCTURE MUST HAVE A VERY LOW RESISTANCE, THEREBY ELIMINATING THE PARTIALLY STABLIZED ZIRCONIAS. THE FEASIBILITY OF AN ALTERNATIVE, PROPRIETARY CERAMIC IS BEING ASSESSED THAT OFFERS TWO OUTSTANDING ADVANTAGES: OXYGEN IONIC CONDUCTIVITIES 30-50 LARGER THANTHE BEST ZIRCONIAS AND FAVORABLE SINTERING TEMPERATURES FOR FABRICATING VERY LOW RESISTANCE CELLULAR-HONEYCOMB STRUCTURES. BASEDON MEASURED OXYGEN-GENERATION RATES, MODEL CALCULATIONS ARE BEING CARRIED OUT FOR VARIOUS HONEYCOMB-TYPE GEOMETRIES TO STUDY POWER CONSUMPTION, PRESSURE, MASS-FLOW RATE, SIZE, AND EFFICIENCY. IDEAL JOULE-THOMPSON EXPANSION CYCLES ARE BEING STUDIED FOR REFRIGERATION CAPACITY AT TEMPERATURES 50-90K.

* information listed above is at the time of submission.

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