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EUROSTARS-EUROSTARS

E!113720 Multi-Gas Sensing enabled by Meta-surfaces

Alternative title: Multi gass måling gjort mulig med meta-overflater

Awarded: NOK 1.3 mill.

Optimization of industrial processes and reducing air pollution stemming from them is a more and more important quest to increase process efficiencies, protect the environment and assure peoples? health throughout Europe and the world. Tunable diode laser absorption spectroscopy (TDLAS) has become a well-accepted technology for in-situ gas concentration measurements of processes in all kinds of industries. While powerful, TDLAS is typically limited to only one gas per instrument. This leads to a high a capacity extension invest for customers since two analysers must be put into place if two gases need to be monitored simultaneously. It is therefore desirable to combine the two analyzers in a single compact unit. The aim of this project is to overcome the need for installing several analysers and develop a concept enabling true multi-gas sensing with one laser module. The new device is able to spatially combine up to three single mode infrared laser beams whose emission lines are further separated than what can be realized with a single laser chip. For this, metasurfaces and micro-optics will be used to enable beam shaping in a compact and novel way for this application to develop a compact laser module. The envisioned meta-optic lens will be designed to impose focusing phase profiles with equal focal length onto incident light fields at two or three different frequencies. This shall be realized using resonant nanostructures on an IR-transparent substrate, whose structural parameters vary as a function of the in-plane position to locally adjust the phase of the transmitted light to the desired value. This enables the use of the best suited absorption lines for the targeted applications and is the core of the development of this project. It is expected that the optical system of the analyser can be reduced by at least 50% due to the implementation of the novel light source. The performance of the final analyzer will be demonstrated in a field-application test.

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Optimization of industrial processes and reducing air pollution stemming from them is a more and more important quest to increase process efficiencies, protect the environment and assure peoples’ health throughout Europe and the world. Tunable diode laser absorption spectroscopy (TDLAS) has become a well-accepted technology for in-situ gas concentration measurements of processes in all kinds of industries. While powerful, TDLAS is typically limited to only one gas per instrument. This leads to a high a capacity extension invest for customers since two analysers must be put into place if two gases need to be monitored simultaneously. It is therefore desirable to combine the two analyzers in a single compact unit. The aim of this project is to overcome the need for installing several analysers and develop a concept enabling true multi-gas sensing with one laser module. The new device is able to spatially combine up to three single mode infrared laser beams whose emission lines are further separated than what can be realized with a single laser chip. For this, metasurfaces and micro-optics will be used to enable beam shaping in a compact and novel way for this application to develop a compact laser module. The envisioned meta-optic lens will be designed to impose focussing phase profiles with equal focal length onto incident light fields at two or three different frequencies. This shall be realized using resonant nanostructures on an IR-transparent substrate, whose structural parameters vary as a function of the in-plane position to locally adjust the phase of the transmitted light to the desired value. This enables the use of the best suited absorption lines for the targeted applications and is the core of the development of this project. It is expected that the optical system of the analyser can be reduced by at least 50% due to the implementation of the novel light source. The performance of the final analyzer will be demonstrated in a field-application test.

Funding scheme:

EUROSTARS-EUROSTARS