TEMPERATURE MEASUREMENT BY NONCONTACT METHOD FOR CZOCHRALSKITYPE CRYSTAL GROWTH

Award Information
Agency:
National Aeronautics and Space Administration
Branch
n/a
Amount:
$49,000.00
Award Year:
1988
Program:
SBIR
Phase:
Phase I
Contract:
n/a
Award Id:
8181
Agency Tracking Number:
8181
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
Hubzone Owned:
N
Minority Owned:
N
Woman Owned:
N
Duns:
n/a
Principal Investigator:
() -
Business Contact:
() -
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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