✦ LIBER ✦

A highly stable cylindrical microwave cavity resonator for the measurement of the relative permittivities of gases

✍ Scribed by M.B. Ewing; D.D. Royal

Publisher: Elsevier Science
Year: 2002
Tongue: English
Weight: 146 KB
Volume: 34
Category: Article
ISSN: 0021-9614
DOI: 10.1006/jcht.2002.0962

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✦ Synopsis

We present a new and highly stable cylindrical microwave cavity resonator designed for the measurement of the relative permittivities of gases. The cylinder has an internal volume of just 5.7 cm 3 , which makes it the smallest such a resonator reported to date. The equipment and procedure used to measure the resonance frequencies and halfwidths with fractional random errors better than ±6 • 10 -7 and ±4 • 10 -3 , respectively, are described. We have developed also an analytical model which describes the cylinder's resonant behaviour with a fractional accuracy of the order of ±10 -6 . Our model includes a novel method for determining the perturbation due to the presence of an opening in the boundary wall which is shown to be in excellent agreement with experimental results.

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