The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 05, 2022
Filed:
May. 03, 2019
Universiteit Leiden, Leiden, NL;
Frans Snik, Leiden, NL;
Christoph Ulrich Keller, Leiden, NL;
UNIVERSITEIT LEIDEN, Leiden, NL;
Abstract
Apparatus () for determining presence of a gas () is provided, the apparatus () comprising: one or more retarders () to spectrally modulate polarisation of received radiation in accordance with a plurality of polarised spectral modulation profiles which are offset in phase from each other, the radiation output from the one or more retarders () comprising radiation having polarisation spectrally modulated in accordance with the said plurality of polarised spectral modulation profiles in a common beam of radiation; one or more polarisers (); and radiation detectors () to detect radiation output from the one or more retarders () filtered for respective polarisation states by the one or more polarisers (), the detectors () selectively and separately detecting on different detectors at the same time polarised radiation conforming to each of at least first and second of the said polarised spectral modulation profiles to thereby provide at least respective first and second polarisation-dependent radiation intensity measurements from which the presence of the gas () can be determined.