Nederlandse Organisatie Voor Toegepast-natuurwetenschappelijk Onderzoek Tno

Marijn Sandtke

James Peter Robert Day

Daniel Perez Calero

Tom Duivenvoorde

Kees Moddemeijer

The present disclosure concerns a spectrometer () and method for generating a two dimensional spectrum (S). The spectrometer () comprises a main grating () and cross dispersion element (). An imaging mirror () is arranged for reflecting and focussing dispersed radiation (R) from the main grating () towards an image plane (IP) for imaging the two dimensional spectrum (S) onto an image plane (IP) of the spectrometer (). A correction lens () is arranged for correcting optical aberrations in the imaging of the two dimensional spectrum (S) in the image plane (IP). The imaging mirror () and correction lens () have a coinciding axis of cylindrical symmetry (AS).

Spectrometer for generating a two dimensional spectrum

The present disclosure concerns a monolithic spectrometer for spectrally resolving light. The spectrometer comprises a body of solid material having optical surfaces arranged to guide the light along an optical path inside the body. A collimating surface and focusing surface are part of a single surface having a continuous optically functional shape. The surfaces of the body are arranged to have a third or fourth part of the optical path between a grating surface and an exit surface cross with a first part of the optical path between an entry surface and a collimating surface.

Monolithic spectrometer

The present disclosure concerns a method and detector () for detecting an analyte () in a sample volume (), such as nitrosamine in an amine solvent. The method comprises measuring a resonance Raman spectrum (I) with a first light beam (PI) matching an electronic transition of the analyte (). The detection of the analyte is enhanced by measuring an off-resonance Raman spectrum () using a second light beam (P) that is shifted in wavelength at least 10 nm away from the electronic resonance. The resonance Raman signal (S) of the analyte () is isolated from the background (Q, Q) by a difference analysis between the resonance and off-resonance Raman spectra (I, I). The method and detector () can be employed for detecting nitrosamine in a carbon capture process or plant () that employs an amine solvent.

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's-Gravenhage, Netherlands

Marijn Sandtke