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US 12,687,429 B2Granted
Systems and methods for miniature spatial heterodyne spectrometry
AssigneeCalifornia Institute of Technology
InventorSeyedeh Sona Hosseini
Life of this patent
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Abstract
Systems and methods for miniature spatial heterodyne spectrometer (SHS) systems are described. Methods for optimizing the miniature SHS systems can reduce the sizes and format while achieving high sensitivity and detection quality. The miniature SHS systems can be deployed for handheld use in real-world or remote activities outside of research or diagnostic facilities.
Claims22
A device for performing spectroscopy, comprising:
- a spatial heterodyne spectrometer (SHS) core comprising a beam-splitter, a first grating, and a second grating;
- wherein the beam-splitter, the first grating, and the second grating form a 90° angle with the beam-splitter at the vertex of the angle;
- and wherein the beam-splitter is configured to split the incoming light to the first grating and the second grating;
- fore-optics aligned with the SHS core and configured to direct incoming light into the SHS core, wherein the fore-optics comprises a light collection lens and a collimating lens, wherein the light collection lens produces a minimum root mean square spot size at a field stop plane, and wherein an aperture stop is controlled at a position before the first power element in the fore-optics;
- aft-optics aligned with the SHS core, such that light exiting the SHS core passes into the aft optics;
- and
- a detector to image a fringe pattern generated by the SHS core.
4 more elements
A method of using a spectroscopy device, comprising:
- obtaining a light from a sample into a spectroscopy device, wherein the spectroscopy device comprises:
- a spatial heterodyne spectrometer (SHS) core comprising a beam-splitter, a first grating, and a second grating;
- wherein the beam-splitter, the first grating, and the second grating form a 90° angle with the beam-splitter at the vertex of the angle;
- and wherein the beam-splitter is configured to split the incoming light to the first grating and the second grating;
- fore-optics aligned with the SHS core and configured to direct incoming light into the SHS core, wherein the fore-optics comprises a light collection lens and a collimating lens, wherein the light collection lens produces a minimum root mean square spot size at a field stop plane;
- aft-optics aligned with the SHS core, such that light exiting the SHS core passes into the aft optics;
- and
- a detector to image a fringe pattern generated by the SHS core;
- wherein an aperture stop is controlled at a position before the first power element in the fore-optics
- wherein the light passes through the fore-optics into the SHS core to image a fringe pattern on the detector;
- and
- analyzing the fringe pattern to identify a component within the sample.
9 more elements
A method for making a spectroscopy device, comprising:
- identifying an angle α for a field widening prism based on a desired heterodyne wavelength, index of refraction of a construction material, and frequency of a grating;
- optimizing fore-optics as an afocal system, wherein the afocal system comprises a light collection lens, a collimating lens, a beam splitter, a first field widening prism, and a first grating and produces a minimum root mean square spot size at a field stop plane, and wherein an aperture stop is controlled at a position before the first power element;
- optimizing aft optics as a re-imaging system, wherein the re-imaging system comprises at least one lens, the beam splitter, a second field widening prism, and a second grating;
- and
- optimizing a detector position, such that an image at a pupil of the fore-optics is re-imaged on the detector.
2 more elements
Dependencies are inferred from the claim text.