Imec Vzw

Universiteit Gent

Imec USA Nanoelectronics Design Center

Anton Vasiliev

Joris Van Campenhout

Roeland Baets

Eva Ryckeboer

Giorgio Signorello

Orges Furxhi

Olivier Rousseaux

Xiaomin Nie

Abdul Rahim

The present disclosure relates to an optical alignment compensation system for a gas detection system, in particular, to an integrated alignment compensation system for an open-path gas sensing system. The optical alignment compensation system of the disclosure is able to compensate for unwanted drifts of a retroreflector. The optical alignment system comprises an array of transceiver pairs, wherein each transceiver pair is configured to transmit and receive light with an optical spectrum in an absorption region of a gas to be detected. Further, it comprises a retroreflector arranged at a nominal position and configured to reflect the light. Further, it comprises an optical element arranged and configured to direct the light from at least one of the transceiver pairs along an optical path through the gas to the retroreflector, to receive the light reflected by the retroreflector along the optical path, and to direct the reflected light to the respective transceiver pair. Further, it comprises a control unit configured to select one of the transceiver pairs for transmitting and receiving the light, wherein the control unit is configured to select the transceiver pair that receives the reflected light with the highest signal response.

Optical alignment compensation system for a gas detection system

An integrated wavelength-selective filter device comprises a first optical element, for directing received radiation into a direction defined by a first angle, and a second optical element being a diffractive element configured for diffracting the directed radiation under a second angle. The second angle is such that for a single reference wavelength the diffracted radiation is directed into a propagation medium for advancing therein towards a predetermined position on the first optical element or on a further optical element for filtering radiation having a wavelength substantially matching the reference wavelength from radiation having a substantially different wavelength. The propagation medium is formed from a material that is different from any material of the substrate of the first and the second optical element.

Temperature insensitive filter

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Bredene, Belgium

Anton Vasiliev