Accession Number:

AD0285381

Title:

METHODS FOR PRECISION TEMPERATURE CONTROL

Descriptive Note:

Corporate Author:

LITTLE (ARTHUR D) INC CAMBRIDGE MASS

Report Date:

1962-06-01

Pagination or Media Count:

1.0

Abstract:

IT IS POSSIBLE TO FABRICATE A MINIATURE, PARTIALLY SILVERED Pyrex dewar whose vacuum will not deteriorate appreciably for at least 6 months. Pyrex remains the best choice of material from which to make glass dewars. It is possible to make an oven with an accessible crystal whose insulation system has a heat loss of less than 300 milliwatts between -55 and 85 C. A partially silvered Pyrex outer dewar combined with our standard Pyrex inner dewar can improve the performance of the inner dewar by at least 100 milliwatts at the expense of about 2-14 in. increased volume. Using this insulation system in conjunction with a fully operational core, it is possible to make an oven accessible crystal which requires a total average input of less than 400 milliwatts to maintain the crystal at 85 C while ambient is at -55 C. It is possible to maintain the crystal temperature to within 0.10 C over the ambient temperature range of -55 to 80 C. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE