Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Apparatus for controlling the temperature of a near-infrared analyzer










Image Number 2 for United States Patent #5523563.

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.








 
 
  Recently Added Patents
Rule-based stimulation program search
Chair
Solid-state imaging device and method for manufacturing the same
Antenna device and wireless communication apparatus
Organic electroluminescence element
Compositions and methods of vascular injury repair
Writing implement
  Randomly Featured Patents
12,13(E)-Didehydro-13,14-dihydro-9,10-didehydro-9-deoxy-PGD.sub.2 compounds
Method of making thieno-pyridine derivatives
Glue stick and applicator
Third axle attachment for motor vehicles
Locomotive solid fuel gasifier unit
Method for reducing processing power requirements of a video decoder
Lighting control switch
Computer network security system employing portable storage device
Noise damping device
Novel oxo-ionol carbonates useful as tobacco flavorants