Method and apparatus for analysis by means of microwaves
First Claim
1. Method of analyzing a gas by means of microwave absorption comprising the steps of:
- generating a microwave at at least one frequency;
continuously sweeping the microwave frequency over an absorption frequency of a known pure gas component;
transmitting the microwave frequency to a measuring cell containing the gas to be measured and to a reference cell containing the known pure gas component;
detecting an absorption measurement signal from the measuring cell;
detecting an absorption reference signal from the reference cell;
integrating the intensity of the measurement signal; and
applying an alternating Stark voltage having a phase shift to the measuring cell and to the reference cell.
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Accused Products
Abstract
A method for analyzing a gas by means of microwave absorption including the steps of: generating a microwave at at least one frequency; continuously sweeping the microwave frequency over the absorption frequency of a known pure gas component; transmitting the microwave frequency to a measuring cell containing the gas to be measured and to a reference cell containing the known pure gas component; detecting an absorption measurement signal from the measuring cell; detecting an absorption reference signal from the reference cell; integrating the intensity of the measurement signal; and applying an alternating Stark voltage with a phase shift to the measuring cell and to the reference cell. Also provided is an apparatus which may be used in conjunction with this method.
13 Citations
14 Claims
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1. Method of analyzing a gas by means of microwave absorption comprising the steps of:
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generating a microwave at at least one frequency; continuously sweeping the microwave frequency over an absorption frequency of a known pure gas component; transmitting the microwave frequency to a measuring cell containing the gas to be measured and to a reference cell containing the known pure gas component; detecting an absorption measurement signal from the measuring cell; detecting an absorption reference signal from the reference cell; integrating the intensity of the measurement signal; and applying an alternating Stark voltage having a phase shift to the measuring cell and to the reference cell. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. Apparatus for the analysis of gaseous media by means of the absorption of microwaves comprising
at least one microwave transmitter; -
at least one measuring cell; at least one detector for detecting absorption by a gas sample placed in the measuring cell and for producing a measurement signal; an amplifying means for amplifying the measurement signal; a display means for displaying the measurement signal; a control device for the microwave transmitter, the control device being configured to continuously control a frequency determining voltage for the microwave transmitter over an adjustable frequency range; and an integrator for integration of the measurement signal during the change in the microwave frequency, said integrator being disposed downstream of the detector. - View Dependent Claims (10, 11, 12, 13, 14)
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Specification