Abstract:
The present application discloses a system comprising a compact curved grating (CCG) and its associated compact curved grating spectrometer (CCGS) or compact curved grating wavelength multiplexer/demultiplexer (WMDM) module and a method for making the same. The system is capable of achieving a very small (resolution vs. size) RS factor. The location; of the entrance slit and detector can be adjusted in order to have the best performance for a particular design goal. The initial groove spacing is calculated using a prescribed formula dependent on operation wavelength. The location of the grooves is calculated based on two conditions. The first one being that the path-difference between adjacent grooves should be ah integral multiple of the wavelength in the medium to achieve aberration-free grating focusing at the detector or a first anchor output slit even with large beam diffraction angle from the entrance slit or input slit, the second one being specific for a particular design goal of a curved-grating spectrometer.
Abstract:
A dispersive element for a spectrometer comprises a dispersive body (100, 200, 300) with an entrance surface (101, 201, 301), a first and a second optical interface (103, 104, 203, 204, 303, 304), and a collection surface (105, 205, 305). The dispersive body (100, 200, 300) comprises an optically transparent material. The entrance surface (101, 201, 301) is designed for incident light to enter the dispersive body (100, 200, 300). The collimation surface (102, 202, 308) is positioned downstream the entrance surface (101, 201, 301) and has a curvature designed to collimate the incident light by means of total internal reflection. The first and second optical interface (103, 104, 203, 204, 303, 304) are designed to receive and disperse the collimated light. The collection surface (105, 205, 305) have a curvature designed to collect the dispersed light from the second optical interface and focus onto a focal plane. A spectrometer based on the dispersive element is described.
Abstract:
A hyperspectral imaging system and a method are described herein for providing a hyperspectral image of an area of a remote object (104). In one aspect, the hyperspectral imaging system includes a fore optic (106) with optics for acquiring and projecting an image from a remote object, a scannable slit mechanism (108, 208) with a plurality of slits for receiving the projected image, where the projected image simultaneously illuminates two or more of the plurality of slits, a spectrometer (110) for receiving and dispersing images passing through the two or more simultaneously-illuminated slits, and a two-dimensional image sensor (112) for recording images received from the spectrometer, where the images received from different slits are recorded on different sets of detection elements of the two-dimensional image sensor.
Abstract:
A hyperspectral imaging system (100b) and a method are disclosed herein for providing a hyperspectral image of an area of a remote object (e.g., scene of interest 104). In one aspect, the hyperspectral imaging system includes at least one optic (106), a rotatable disk (302) which has multiple straight slits (304) formed therein, a spectrometer (110), a two-dimensional image sensor (112), and a controller (114). In another aspect, the hyperspectral imaging system includes at least one optic, a rotatable disk (which has at least one spiral slit formed therein), a spectrometer, a two-dimensional image sensor, and a controller. In yet another aspect, the hyperspectral imaging system includes at least one optic, a rotatable drum (which has a plurality of slits formed on the outer surface thereof and a fold mirror located therein), a spectrometer, a two-dimensional image sensor, and a controller.
Abstract:
A multi field of view hyperspectral imaging device (300) and method for using the same are described herein. In one embodiment, the multi field of view hyperspectral imaging device comprises multiple fore optics (308, 310), multiple fold mirrors (312, 314), a slit including multiple openings (318, 320), a spectrometer (302), and a 2 - dimensional detector.
Abstract:
A confocal spectrometer provides astigmatic optics which supply a monochromator or spectrograph with the image of a sample, with the astigmatic optics thereby providing separate first and second (tangential and sagittal) focal planes for the image. The monochromator/spectrograph has an entrance slit (120) oriented along one of the focal planes, and this slit defines the spectral resolution of the monochromator/spectrograph and the field of view of the sample in one direction (in one focal plane). A supplemental slit (132) is situated outside the monochromator/spectrograph adjacent the entrance slit, with the supplemental slit being oriented along the other focal plane. The supplemental slit therefore defines the field of view of the sample in a perpendicular direction (in the other focal plane) By varying the width of the supplemental and/or entrance slits (132, 120), one may easily achieve the desired field of view.