Hyper-spectral imaging methods and devices
View Patent ↗A hyper-spectral imaging system comprises imaging foreoptics ( 1020 ) to focus on a scene or object of interest ( 1010 ) and transfer the image of said scene or object ( 1010 ) onto the focal plane of a spatial light modulator ( 1030 ), a spatial light modulator ( 1030 ) placed at a focal plane of said imaging foreoptics ( 1020 ), an imaging dispersion device ( 1040 ) disposed to receive an output image of the spatial light modulator ( 1030 ), and an image collecting device disposed to receive the output of the imaging dispersion device ( 1040 ).
1. A hyper-spectral imaging system comprising:
imaging foreoptics to focus on a scene or object of interest and transfer the image of said scene or object onto the focal plane of a spatial light modulator;
a spatial light modulator placed at a focal plane of said imaging foreoptics;
an imaging dispersion device disposed to receive an output image of said spatial light modulator; and
an image collecting device disposed to receive the output of said imaging dispersion device.
2. The system of claim 1 , wherein said image collecting device is a device from the set consisting of a CCD array camera, or a Focal Plane Array or camera.
3. The system of claim 1 , wherein said spatial light modulator is a micro-mirror array, 2-D Liquid crystal array, or micro-shutter array.
4. The system of claim 1 , wherein said spatial light modulator is capable of directing coded patterns of radiation in two or more distinct directions at least one of which leads into said imaging dispersion device.
5. The system of claim 1 , wherein coded apertures controlled by the spatial light modulator consist of submodulated superpixels which focus on the pixels of the image collecting device consequently increasing its spatial resolution.
6. The system of claim 1 , wherein the spatial light modulator is controlled to analyze only a subportion of the full image field of the system.
7. The system of claim 1 , wherein the image collecting device is controlled to measure only a subportion of the full field of possibly impinging radiation.
8. The system of claim 1 , wherein the spatial light modulator can control the size of spatial-spectral resolution elements.
9. The system of claim 1 , wherein the spatial light modulator is operable to enable multiplexing in the direction of dispersion by presenting coded aperture patterns that are Hadamard encodements of single slit patterns in the direction perpendicular to said dispersion.
10. The system of claim 1 , wherein the spatial light modulator is driven to emulate a conventional slit-scan imaging spectrograph by allowing only a line/slit perpendicular to the dispersion access to propagate through the system and then translating said slit from one end of full field of view to the other.
11. The system of claim 10 , wherein slit width and height and location are controlled to enable the control of spectral and spatial resolution as well as the possibility to analyze a subregion of the full field of view.
12. The system of claim 1 , wherein all imaging foreoptics and dispersion system all emply offner type reflective imaging optics which allow performance over multiple wavelength regions.