Compact spectrometer
AssigneeLightHaus Photonics Pte. Ltd.
InventorPoh Boon Phua
Life of this patent
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Abstract
A spectrometer for measuring a spectral signature of an object comprises fringe generating optics for use with a camera and a processor. The fringe generating optics are formed of front optics and birefringent optics. The front optics comprises a diffuser adapted to receive light from the object. The birefringent optics is adapted to receive light from the diffuser and to generate interference fringes. The camera is adapted to receive the interference fringes and the processor generates the spectral signature of the object. This spectrometer is an improved Fourier transform spectrometer suitable for use with digital cameras, such as cameras found in mobile devices.
Claims23
A spectrometer for measuring a spectral signature of an object comprising, in combination:
- front optics comprising a diffuser adapted to receive light from the object;
- birefringent optics which receive light from the diffuser and form orthogonal polarization components of the light, wherein the front optics and the birefringent optics combined form fringe generating optics which to generate interference fringes, and the orthogonal polarization components have a phase difference which varies with an angle of incidence of the light received by the birefringent optics;
- a camera adapted to receive the interference fringes;
- and
- a processor adapted to generate the spectral signature of the object.
Fringe generating optics for a spectrometer which create interference fringes from light from an object and which is adapted to transmit the interference fringes to a camera, comprising, in combination:
- a housing;
- front optics positioned in the housing comprising a diffuser adapted to receive light from the object;
- and
- birefringent optics positioned in the housing which receive light from the diffuser and form orthogonal polarization components of the light, wherein the front optics and birefringent optics combined form fringe generating optics which generate interference fringes, and the orthogonal polarization components have a phase difference which varies with an angle of incidence of the light received by the birefringent optics.
Dependencies are inferred from the claim text.