TEMPERATURE MEASUREMENT BY NONCONTACT METHOD FOR CZOCHRALSKITYPE CRYSTAL GROWTH

Award Information
Agency: National Aeronautics and Space Administration
Branch: N/A
Contract: N/A
Agency Tracking Number: 8181
Amount: $49,000.00
Phase: Phase I
Program: SBIR
Awards Year: 1988
Solicitation Year: N/A
Solicitation Topic Code: N/A
Solicitation Number: N/A
Small Business Information
Po Box 2569 Highway 31 South, Decatur, AL, 35602
DUNS: N/A
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 () -
Business Contact
Phone: () -
Research Institution
N/A
Abstract
IN THE GROWTH OF CRYSTALS FROM MELTING MATERIALS USING THE CZOCHRALSKI METHOD, A GOOD TECHNIQUE OF ACCURATELY CONTROLLING THE PROCESS DOES NOT EXIST. THERMOCOUPLES ARE LARGELY USED AT PRESENT, BUT THEY DO NOT PROVIDE ADEQUATE INFORMATION SUCH AS THE THERMAL GRADIENT ACROSS A SINGLE LARGE CRYSTAL. THE USE OF CHARGE-COUPLED DEVICES TO MEASUREAND CONTROL CRYSTAL GROWTH USING THE CZOCHRALSKI METHOD IS THE INNOVATION BEING STUDIED IN THIS PROJECT. ARRAYS OF CHARGE-COUPLED DEVICES AND PHOTOVOLTAIC DETECTORS DETECT TEMPERATURE VARIATIONS OF A SURFACE AREA. THESE DETECTORS CAN BE ADAPTED TO MONITOR THE TEMPERATURE MEASUREMENTS WITHIN THE CRYSTAL GROWTH OVENS AND PROVIDE FEED-BACK CONTROL TO REGULATE THE OVEN. DURING PHASE I, THE WORK CONCENTRATED ON TESTING SENSOR TYPES AND RESEARCHING THE VARIOUS COMPONENTS OF A CONTROL SYSTEM. IT WAS CONCLUDED THAT CHARGE-COUPLED DEVICES WERE SUFFICIENTLY UNIFORM TO BE USED AS A THERMAL SENSOR ABOVE 200 CENTIGRADE.

* Information listed above is at the time of submission. *

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