Oxygen concentration measuring device
AssigneeABB Research Ltd.
InventorsKen Yves Haffner, Julio Danin Lobo, Juergen Kappler, Thomas Bauer
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Abstract
An oxygen concentration measuring device is provided for determining an oxygen concentration of a gas in a sample volume. The device includes an optical device configured for irradiating the sample volume containing oxygen with a first UV radiation intensity, at least one wavelength of which is close to a spectral absorption line of oxygen, a magnetic field generator configured for applying a magnetic field at the sample volume, and a UV light detector configured for measuring a second UV radiation intensity coming from the sample volume. The oxygen concentration in the sample volume is determined on the basis of the applied magnetic field and the measured second UV radiation intensity.
Claims38
An oxygen concentration measuring device configured for determining an oxygen concentration of a gas in a sample volume containing oxygen, the oxygen concentration measuring device comprising:
- an optical device configured for irradiating the sample volume with a first UV radiation having a first UV radiation intensity, the optical device including a UV light source configured for emitting the first UV radiation, the first UV radiation including at least one wavelength which is close to a spectral absorption line of oxygen;
- a magnetic field generator configured for applying a magnetic field at the sample volume;
- a UV light detector configured for measuring a second UV radiation intensity of a second UV radiation coming from the sample volume;
- an evaluation unit configured for determining the oxygen concentration in the sample volume on the basis of the applied magnetic field and the measured second UV radiation intensity;
- and
- a reference cell which contains oxygen of a reference concentration,
- wherein the evaluation unit is configured for receiving a measured oxygen concentration reference signal indicative of the oxygen concentration in the reference cell, and for determining the oxygen concentration in the sample volume on the basis of the oxygen concentration reference signal.
A method for determining an oxygen concentration in a sample volume containing oxygen, the method comprising:
- emitting a first UV radiation from a UV light source towards the sample volume, the UV radiation including at least one wavelength which is close to a spectral absorption line of oxygen;
- irradiating the sample volume with the first UV radiation;
- applying a magnetic field at the sample volume;
- measuring the intensity of a second UV radiation coming from the sample volume;
- determining the oxygen concentration in the sample volume on the basis of the applied magnetic field and the measured intensity of the second UV radiation;
- performing a calibration of the evaluated signal versus an actual oxygen concentration at least one of continuously and intermittently during operation by reference measurements with a reference oxygen cell.
Dependencies are inferred from the claim text.