Design and Development of a Micro-Thermocouple Sensor for Determining Temperature and Relative Humidity Patterns Within an Airstream

[+] Author and Article Information
A. D. Eisner

NSI Technology Services Corporation, Environmental Sciences, Research Triangle Park, NC 27709

T. B. Martonen

U.S. Environmental Protection Agency, Research Triangle Park, NC 27711

J Biomech Eng 111(4), 283-287 (Nov 01, 1989) (5 pages) doi:10.1115/1.3168380 History: Received July 26, 1988; Revised June 08, 1989; Online June 12, 2009


This 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 (i.e., theoretically predicted) relative humidity agreed to within 0.5 to 1.0 percent relative humidity. Procedures that would decrease this discrepancy even further were pinpointed, and advantages of using the miniature psychrometer were assessed.

Copyright © 1989 by ASME
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