TRANSFER

Award Information
Agency:
National Aeronautics and Space Administration
Branch
n/a
Amount:
$49,595.00
Award Year:
1984
Program:
SBIR
Phase:
Phase I
Contract:
n/a
Award Id:
1743
Agency Tracking Number:
1743
Solicitation Year:
n/a
Solicitation Topic Code:
n/a
Solicitation Number:
n/a
Small Business Information
111 Downey Street, Norwood, MA, 02062
Hubzone Owned:
N
Minority Owned:
N
Woman Owned:
N
Duns:
n/a
Principal Investigator:
DAVID R. RAUH
INVESTIGATOR
() -
Business Contact:
() -
Research Institute:
n/a
Abstract
SINCE HEAT TRANSFER IN SPACE IS LARGELY RADIATIVE, THE EMISSIVITY OF THE SURFACES LINKING THE PAYLOAD TO THE SPACE ENVIRONMENT ARE KEY TO THE PROBLEM OF TEMPERATURE STABILIZATION AND CONTROL IN ORBITING SPACECRAFT. THIS PROJECT CONSIDERS THE DESIGN AND FABRICATION OF SURFACES WHICH WOULD HAVE VARIABLE THERMAL INFRARED EMISSIVITY. CONTROL IS ACHIEVED BY PASSAGE OF A SMALL DC ELECTRICAL CURRENT THROUGH THE PANEL AND IS BASED ON THE CONCEPT OF "ELECTROCHROMISM" IN THIN FILMS OF SOME METAL OXIDES, SUCH AS WO3 AND IRO2. WHEN CRYSTALLINE FILMS OF THESE MATERIALS ARE REDUCED ELECTROCHEMICALLY BY INCORPORATION OF HYDROGEN OR ALKALI METALS, THEY UNDERGO AN INCREASE IN REFLECTIVITY PROPORTIONAL TO THE CHARGE PASSED. IT IS INTENDED FOR PHASE I TO PREPARE THIN FILMS OF WO3 WITH HIGH CRYSTALLINE PERFECTION, AND TO MEASURE SPECTROSCOPICALLY THE INFRARED REFLECTANCE MODULATION OUT TO 50 MICRONS FOR HXWO3 AS A FUNCTION OF X. THE RESULTING EMISSIVITIES WILL BE USED IN SIMPLE MODELS OF HEAT TRANSFER IN SATELLITES TO PREDICT THE EXTENT OF THERMAL CONTROL THAT COULD BE ACHIEVED DURING ORBIT. A SMALL SELF-CONTAINED VARIABLE EMISSIVITY ELEMENT WILL BE CONSTRUCTED DURING PHASE I AND WILL SERVE AS A BASIS FOR PHASE II RESEARCH AND DEVELOPMENT. PHASE II AND SUBSEQUENT COMMERCIAL DEVELOPMENT WOULD ADDRESS THE DETAILED CONSTRUCTION OF LARGER AREA PANELS, OPTIMIZATION OF REFLECTIVE ELECTROCHROMIC MATERIALS, AND LONG-TERM DEGRADATION MECHANISMS OF INTEGRATED STRUCTURES.

* information listed above is at the time of submission.

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