Piezoelectric-tuned microwave cavity for absorption spectrometry

Patent · 31 December 1977

OSTI ID:863171

Leskovar, Branko ^[1]; Buscher, Harold T ^[2]; Kolbe, William F ^[3]

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1. Moraga, CA
2. Orlando, FL
3. Berkeley, CA

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.

• Research Organization: Lawrence Livermore National Laboratory (LLNL), Livermore, CA
• DOE Contract Number: W-7405-ENG-48
• Assignee: United States of America as represented by United States (Washington, DC)
• Patent Number(s): US 4110686
• OSTI ID: 863171
• Country of Publication: United States
• Language: English

Related Subjects

/324/73/
absorption
absorption spectrometry
analyzed
applied
band
cavity
detected
driven
energy
energy absorption
frequencies
frequency
frequency modulated
gas
gas sample
gas samples
highly
highly polished
indication
mechanically
mechanically driven
microwave
microwave cavity
microwave energy
microwave frequencies
microwave frequency
modulated
particular
piezoelectric
piezoelectric transducer
piezoelectric-tuned
polished
pollutant
pollutants
provided
sample
samples
spectrometry
synchronism
transducer
tune
tuned
wall
walls
wave cavity
wave energy
wave frequencies
wave frequency