Measuring and testing – Inspecting
Patent
1997-11-28
2000-08-08
Raevis, Robert
Measuring and testing
Inspecting
198817, G01N 2904
Patent
active
060984732
ABSTRACT:
Milli-Kelvin temperature control in an air chamber by use of coarse and fine temperature control systems, and through the use of structure for handling air flow within the chamber. The coarse control system provides enough heating or cooling power to hold the chamber temperature at a value near, but below, the desired operating temperature, thus leaving a small differential to be made up by the fine control loop. The coarse control has a fairly large thermal time constant (in the order of tens of seconds). The fine control loop has a very fast response time (in the order of fractional seconds). This fast response time is achieved by the use of a heater having minimal thermal mass, a fast response sensor, and a high precision controller. Air circulation within the chamber is forced by an in-line assembly of a number of high volume blowers, all having a common shaft, driven by a constant speed motor. The formation of laminar flow patterns, with their tendency to spontaneous shift in the patterns, is prevented by the use of a limited number of deflectors, i.e. small metal plates placed at nearly right angles to the air stream, fastened to the chamber's ceiling.
REFERENCES:
patent: 3179248 (1965-04-01), Manley
patent: 3824840 (1974-07-01), Amberg
patent: 4523724 (1985-06-01), Rerolle
patent: 5318361 (1994-06-01), Chase et al.
patent: 5675098 (1997-10-01), Hobbs
Raevis Robert
Skolnik Robert M.
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