||Design and Development of a MicroThermocouple Sensor for Determining Temperature and Relative Humidity Patterns within an Airstream.
Eisner, A. D. ;
Martonen, T. B. ;
||Northrop Services, Inc., Research Triangle Park, NC.;Health Effects Research Lab., Research Triangle Park, NC.
Atmospheric temperature ;
||Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy.
The paper describes the production and calibration of a miniature psychrometer treated with a specially developed porous coating. The investigation was conducted to determine localized patterns of rapidly changing temperature and relative humidity in dynamic flowing gas environments (e.g., with particular attention to future applications to the human respiratory system). The technique involved the use of dry miniature thermocouples, and wetted miniature thermocouples coated with boron nitride, to act as a wicking material. A precision humidity generator was developed for calibrating the psychrometer. It was found that, in most cases, the measured and expected (theoretically predicted) relative humidity agreed to within 0.5% to 1.0% relative humidity. Procedures that would decrease this discrepancy even further were pinpointed, and advantages of using the miniature psychrometer were assessed.