Universiteit Leiden

Frans Snik

Christoph Ulrich Keller

Christoph Keller

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.

Apparatus and method for determining presence of a gas

A polarimetry apparatus comprising a plurality of flexible light conduits each having first and second ends, and a respective polarization modulator associated with each light conduit, wherein each light conduit is configured to receive incident light from a different predetermined region in space via the first end, and deliver said light to a detector unit via the second end, and wherein the polarization modulator is configured to modulate the polarization of the light to enable a partial or complete polarization state of the incident light to be determined by the detector unit for each light conduit.

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Leiden, Netherlands

Frans Snik