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Controlled freezing of biological samplesApparatus consists of thermocouple connected to semiconductor reference junction. Junction is connected to amplifier that boosts signal by 1,000. High-level signal is displayed on recorder and fed into second amplifier where it is compared with signal from potentiometer of programmed dc reference in bag-temperature programer. Difference in signals indicates output voltage. Remaining circuitry provides zero-phase, time-proportion control of heaters such that heater power is directly proportional to error signal.
Document ID
19780000065
Acquisition Source
Legacy CDMS
Document Type
Other - NASA Tech Brief
Authors
Cygnarowicz, T. A.
Williams, T. E.
Date Acquired
August 9, 2013
Publication Date
June 1, 1978
Publication Information
Publication: NASA Tech Briefs
Volume: 3
Issue: 1
ISSN: 0145-319X
Subject Category
Life Sciences
Report/Patent Number
GSC-12173
Report Number: GSC-12173
ISSN: 0145-319X
Accession Number
78B10065
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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