Multiband spatial heterodyne spectrometer and associated methods
First Claim
1. A dual-path spatial heterodyne spectrometer for determining spectra of incident light comprising:
- a beam splitter configured to split incident light and to direct the incident light upon a first and a second diffraction grating, wherein the first diffraction grating has a first half configured for Littrow reflection of incident light at a first wavelength at a first order at a first angle, and a second half configured for Littrow reflection of incident light at the first wavelength at the first order at a second angle, wherein the second diffraction grating is configured for Littrow reflection of light of the first wavelength, and wherein light reflected by the first and the second diffraction grating forms interference patterns;
an electronic camera for detecting the interference patterns, the camera comprising a detector having at least a first and a second group of pixel sensors; and
a processing device coupled to receive information from the detector and to compute spectra therefrom.
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Abstract
A multiband spatial heterodyne spectrometer for determining spectra in first and second wavelength bands has a beamsplitter configured to split incident light and to direct the incident light upon a first and a second diffraction grating. The gratings are configured for Littrow reflection of incident light of the first wavelength band at a first order and Littrow reflection of incident light of the second wavelength band at a second order. Light reflected by the first and the second diffraction grating forms diffraction patterns imaged by an electronic camera. A dispersive device separates the imaged interference patterns onto separate groups of pixel sensors corresponding to the wavelength bands. A processing device receives information from the detector and computes spectra therefrom. The second diffraction grating is split spatially or temporally to provide two different responses, so the system can disambiguate spectra. In embodiments, the spectrometer computes hyperspectral images of a target.
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Citations
14 Claims
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1. A dual-path spatial heterodyne spectrometer for determining spectra of incident light comprising:
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a beam splitter configured to split incident light and to direct the incident light upon a first and a second diffraction grating, wherein the first diffraction grating has a first half configured for Littrow reflection of incident light at a first wavelength at a first order at a first angle, and a second half configured for Littrow reflection of incident light at the first wavelength at the first order at a second angle, wherein the second diffraction grating is configured for Littrow reflection of light of the first wavelength, and wherein light reflected by the first and the second diffraction grating forms interference patterns; an electronic camera for detecting the interference patterns, the camera comprising a detector having at least a first and a second group of pixel sensors; and a processing device coupled to receive information from the detector and to compute spectra therefrom. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification