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DESIGN AND DEVELOPMENT OF MICRO-THERMOCOUPLE SENSOR FOR DETERMINING TEMPERATURE AND RELATIVE HUMIDITY PATTERNS WITHIN AN AIRSTREAM
Citation:
Eisner, A. AND T. Martonen. DESIGN AND DEVELOPMENT OF MICRO-THERMOCOUPLE SENSOR FOR DETERMINING TEMPERATURE AND RELATIVE HUMIDITY PATTERNS WITHIN AN AIRSTREAM. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/J-89/363 (NTIS PB90215963), 1989.
Description:
This paper describes the production and calibration of a miniature psychrometer treated with a specially developed porous coating. he 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). he technique involved the use of dry miniature thermocouples, and wetted miniature thermocouples coated with boron nitride, to act as a wicking material. recision humidity generator was developed for calibrating the psychrometer. t was found that, in most cases, the measured and expected (theoretically predicted) relative humidity agreed to within 0.5% to 1.0% relative humidity. rocedures that would decrease this discrepancy even further were pinpointed, and advantages of using the miniature psychrometer were assessed.