Gas analyzing method and apparatus for performng the same
AssigneeSagami Chemical Research Center
InventorsHiromichi Uehara, Mitsutoshi Tanimoto, Yasuharu Ijuin
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Abstract
A gas sample including polar molecules is introduced into a cavity (an internal space) of a cavity resonator, the cavity being provided therein with a Stark electrode which is vertically of a microwave electric field resonating at the microwave frequency, and a direct current Stark voltage which is applied to the Stark electrode together with a sine wave modulation voltage is swept, resulting in a microwave absorption spectrum representing the polar molecules in the gas sample. The resonance frequency of the cavity may be made variable to observe various polar molecules individually.
Claims5
A gas analysing method comprising the steps of
- introducing a gas sample into a microwave rectangular cavity resonator having a Stark electrode;
- causing the resonator to resonate at a fixed microwave frequency;
- applying an alternating current Stark voltage as well as a direct current Stark voltage to the Stark electrode;
- varying the magnitude of the direct current Stark voltage;
- and
- observing the absorption spectrum of the gas sample.
A gas analyser comprising
- a microwave rectangular cavity resonator having a Stark electrode disposed therein,
- means for applying an alternating current Stark voltage and a direct current Stark voltage to the Stark electrode and for varying the magnitude of the direct current Stark voltage,
- means for supplying microwave energy of fixed frequency to the rectangular cavity,
- a phase sensitive detector connected to the Stark voltage applying means and to the microwave unit, and
- a recorder connected to the phase-sensitive detector.
Dependencies are inferred from the claim text.