Apparatus 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.
Controlled freezing of biological samples
NASA Tech Briefs ; 3 , 1
1978-06-01
Miscellaneous
No indication
English
Controlled Temperature Gradient Improves Freezing Alloy
NTRS | 1991
|FREEZING-INDUCED FLUID-MATRIX INTERACTION IN BIOLOGICAL TISSUE
British Library Conference Proceedings | 2007
|Storage of biological samples.
NTRS | 1968
|TIBKAT | 1967
|Ultrafast UV pulses excite biological samples
British Library Online Contents | 1997