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A Reference Standard for Measuring Humidity of Air Using a Re-entrant Radio Frequency Resonator

Published

Author(s)

Peter H. Huang, Dean C. Ripple, Michael R. Moldover, Gregory E. Scace

Abstract

We developed a stable reference hygrometer suitable for operation at temperatures above ambient that has a robust design, inherent stability, and a well-understood theory of measurement. This hygrometer uses a reentrant, radio-frequency, cavity resonator operating near 370 MHz to convert the known humidity-dependence of the dielectric constant of H2O/air mixture into easily-measured frequency changes. In this paper, we discuss the achievable repeatability of this device. We expect this hygrometer will be especially valuable for validation of humidity standard generators at mixing ratios in moist gases higher than 20000 parts per million by mass.
Proceedings Title
5th International Symposium on Humidity and Moisture; ISHM 2006 Brazil
Conference Dates
May 2-5, 2006
Conference Location
Rio de Janeiro

Keywords

fuel cell, high humidity, high temperature, humidity standards, hygrometer, radio-frequency, resonat

Citation

Huang, P. , Ripple, D. , Moldover, M. and Scace, G. (2006), A Reference Standard for Measuring Humidity of Air Using a Re-entrant Radio Frequency Resonator, 5th International Symposium on Humidity and Moisture; ISHM 2006 Brazil , Rio de Janeiro, -1, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=902995 (Accessed April 12, 2024)
Created May 2, 2006, Updated February 19, 2017