Radiant energy – Photocells; circuits and apparatus – Temperature control of photocell
Patent
1994-08-12
1996-06-04
Allen, Stephone
Radiant energy
Photocells; circuits and apparatus
Temperature control of photocell
250352, 62 5, 622592, G01N 2135, F25B 900
Patent
active
055235638
ABSTRACT:
A preferred temperature control strategy was devised to remove heat from the analyzer and control the optical bench temperature continuously at aim. A foil-type RTD temperature detector is fastened to the optical bench to serve as a measurement input device for a PID control strategy, which is truly aim-seeking. The control strategy employs a heat pipe technology to remove heat from the analyzer enclosure. A heat pipe utilizes a fluid (such as an alcohol) to remove heat by evaporation of the fluid at an internal air circulation heat exchanger and then recondensing the fluid at an external air circulation heat exchanger. The PID temperature controller achieves the desired temperature setpoint by manipulation of heat exchanger fan speeds. The heat removal rate can be very precisely controlled. In practice, both heat exchanger fans could be controlled together; however, to achieve optimal internal temperature uniformity, the internal heat exchanger fan is maintained at full speed and just the external fan is controlled to adjust heat removal rate. Optical bench temperature control is maintained to plus or minus 0.1 degree C. vs. a typical temperature control band of plus or minus 2 degrees C.
REFERENCES:
patent: 5010736 (1991-04-01), York et al.
patent: 5046018 (1991-09-01), Flewelling et al.
patent: 5422483 (1995-06-01), Ando et al.
W. G. Fateley et al, The Tenets for Using Electromagnetic Radiation in Analytical and Structrual Chemistry, CPAC Informational Document Announcement#53, 1-28, Aug. 9, 1994.
Roger E. Schirmer, Remote Optical Monitoring of Polymer Processing Over Long Fiber Optic Cables, Guided Wave, 28, No. 2, 65-69.
Allen Stephone
E. I. Du Pont de Nemours and Company
Lee John R.
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