Abstract:
A spectrometer (20) comprising an input (24) for optical radiation; a dispersion element, such as a concave focussing reflection diffraction grating (22), for dispersing incident optical radiation passing from the input (24) by wavelength; an output (28) and a spatial light modulator "SLM" (26) disposed to receive a wavelength region of input optical radiation dispersed by the dispersion element and operable to selectively direct wavelength portions of the received wavelength region for receipt at the output (28). The input (24) is configured to provide a plurality of entrance field stops, such as entrance slits (C,D), by means of each of which the dispersion element (22) is, in use, illuminated and each of which is positioned to cooperate with the dispersion element (22) to generate a different dispersed wavelength region at the SLM (26).
Abstract:
Systems and tools for detecting the presence of a substance of interest is presented. The system utilizes a hyperspectral imaging camera to obtain images of an enclosed area, such as a vehicle. Vehicles can include cars, trucks, trains, or boats. The system also includes a processor and storage device. The processor receives the images taken by the hyperspectral imaging camera. Next, the processor determines whether such images contain certain substances. These substances include alcohol, carbon monoxide, illegal substances, and hazardous chemicals. The storage device is electrically coupled to the processor, and is used to store certain data information such as detection events, substance detected, and the time of detection. Such information can be sent over the internet, or streamed live to a laptop at a remote location. The present embodiment can be used by law enforcement to monitor vehicles of interest, and become an important part of public safety.
Abstract:
A method and a solution in a gas chromatography –UV spectrography detector to efficiently increase the flow of photons through the spectrograph to a light sensitive element or elements and maintain functionality despite the absence of a physical window for the light to enter the spectrograph.
Abstract:
A method and system for the remote quantitative detection of a compound in the atmosphere. A spectrometer (6) is attached to a moving platform (1) for measuring a light spectrum along a first path (10) between the spectrometer and a surface area (8). A second light spectrum is measured along a second path (7) between the spectrometer and said surface area (8) which second path has a length different from the first path. The two spectra are compared to determine the concentration of the compound.
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.
Abstract:
The disclosure relates generally to methods and apparatus for using a fiber array spectral translator-based ("FAST") spectroscopic system for performing spectral unmixing of a mixture containing multiple polymorphs. In an embodiment, a first spectrum of a mixture containing polymorphs of a compound is obtained using a photon detector and a fiber array spectral translator having plural fibers. A set of second spectra is provided where each spectrum of the set of second spectra may be representative of a different polymorph of the compound. The first spectrum and the set of second spectra may be compared, and based on the comparison, the presence of one or more polymorphs in the mixture may be determined.
Abstract:
A multi-spectrum, multi-channel imaging spectrometer includes two or more input slits or other input for each input channel. The input slits are vertically and horizontally displaced from each other. The vertical displacements cause spectra from the channels to be vertically displaced on a single image sensor on a stationary image plane. The horizontal displacements cause light beams from the input channels to strike a convex grating at different incidence angles and produce separate spectra having different spectral ranges. A retroflective spectrometer includes a convex grating that, by diffraction, disperses wavelengths of light at different angles and orders approximately back along an incident light beam. A single concave mirror reflects both the input channel and the dispersed spectrum. A prism, set of mirrors, beam splitters or other optical element(s) folds the input channel(s) of a spectrometer to enable the input(s) to be moved away from the plan of the image sensor.
Abstract:
A method and apparatus is disclosed for multi-mode spectral imaging. In one embodiment, the present invention comprises the steps of illuminating an object with (101) with a modified illumination profile, producing a reflected, transmitted or fluorescence image, scanning the object (104), and re-imaging (105) the reflected, transmitted or fluorescence light after modifying the light's optical state. The present invention preferably works in conjunction with other imaging systems to provide both high-spectral resolution images with lower temporal resolution and multiple image acquisition with high temporal resolution.
Abstract:
Die vorliegende Erfindung betrifft ein Verfahren zum Bestimmen von klinischen und/oder chemischen Parametern (S1) in einem Medium (10), wobei Mittel (2), beispielsweise einer Lasereinheit, zum Aussenden von kohärenten Lichtwellen (6) und Mittel (4), beispielsweise einer Phototransistoreinheit, zum Empfangen von Lichtwellen (8) vorgesehen sind. Dabei werden mindestens ein Teil der ausgesendeten Lichtwellen (6) in das Medium (10) abgegeben und die Mittel (4) zum Empfangen von Lichtwellen (8) messen mindestens einen Teil von im Medium (10) reflektierten Lichtwellen (8), wobei aufgrund der Eigenschaften der ausgesendeten und empfangenen Lichtwellen (6; 8) die Parameter (S1) bestimmt werden. Indem mit einer Lasereinheit (2) Lichtwellen (6) in das Medium (10) abgegeben werden und mit einer Phototransistoreinheit (4) die im Medium (10) reflektierten Lichtwellen (8) gemessen werden, können vorteilhaft in einer Verarbeitungs- bzw. Kontrolleinheit die im Zielbereich des Laserstrahles vorkommenden Parameter bestimmt werden (S1).