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Title: Piezoelectric-tuned microwave cavity for absorption spectrometry

Abstract

Gas samples are analyzed for pollutants in a microwave cavity that is provided with two highly polished walls. One wall of the cavity is mechanically driven with a piezoelectric transducer at a low frequency to tune the cavity over a band of microwave frequencies in synchronism with frequency modulated microwave energy applied to the cavity. Absorption of microwave energy over the tuned frequencies is detected, and energy absorption at a particular microwave frequency is an indication of a particular pollutant in the gas sample.

Inventors:
 [1];  [2];  [3]
  1. Moraga, CA
  2. Orlando, FL
  3. Berkeley, CA
Issue Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
OSTI Identifier:
863171
Patent Number(s):
4110686
Assignee:
United States of America as represented by United States (Washington, DC)
Patent Classifications (CPCs):
G - PHYSICS G01 - MEASURING G01R - MEASURING ELECTRIC VARIABLES
G - PHYSICS G01 - MEASURING G01N - INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
piezoelectric-tuned; microwave; cavity; absorption; spectrometry; gas; samples; analyzed; pollutants; provided; highly; polished; walls; wall; mechanically; driven; piezoelectric; transducer; frequency; tune; band; frequencies; synchronism; modulated; energy; applied; tuned; detected; particular; indication; pollutant; sample; microwave frequencies; frequency modulated; microwave frequency; gas sample; energy absorption; microwave energy; microwave cavity; piezoelectric transducer; wave energy; mechanically driven; wave frequency; wave frequencies; gas samples; wave cavity; highly polished; absorption spectrometry; /324/73/

Citation Formats

Leskovar, Branko, Buscher, Harold T, and Kolbe, William F. Piezoelectric-tuned microwave cavity for absorption spectrometry. United States: N. p., 1978. Web.
Leskovar, Branko, Buscher, Harold T, & Kolbe, William F. Piezoelectric-tuned microwave cavity for absorption spectrometry. United States.
Leskovar, Branko, Buscher, Harold T, and Kolbe, William F. Sun . "Piezoelectric-tuned microwave cavity for absorption spectrometry". United States. https://www.osti.gov/servlets/purl/863171.
@article{osti_863171,
title = {Piezoelectric-tuned microwave cavity for absorption spectrometry},
author = {Leskovar, Branko and Buscher, Harold T and Kolbe, William F},
abstractNote = {Gas samples are analyzed for pollutants in a microwave cavity that is provided with two highly polished walls. One wall of the cavity is mechanically driven with a piezoelectric transducer at a low frequency to tune the cavity over a band of microwave frequencies in synchronism with frequency modulated microwave energy applied to the cavity. Absorption of microwave energy over the tuned frequencies is detected, and energy absorption at a particular microwave frequency is an indication of a particular pollutant in the gas sample.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1978},
month = {1}
}

Patent:

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