Abstract:
Apparatus and method for obtaining a plurality of spectral images of a source object in a snapshot using comprising two-dimensional compressed sensing data cube reconstruction (2D CS-SCR) applied to a dispersed-diffused snapshot image. In some embodiments, the snapshot image is obtained through a RIP diffuser. In some embodiments, a randomizer is used to further randomized the dispersed-diffused snapshot image. The 2D CS-SCR includes applying a 2D framelet transform separately to arrays representing different wavebands of spectral cube data derived from the snapshot image. The application of the 2D framelet transform separately to the arrays representing the different wavebands includes application of direct and inverse 2D framelet transforms to the arrays. In some embodiments, the direct and inverse framelet transforms are included in a split Bregman iteration.
Abstract:
There is provided a method for analyzing optical properties of an object, including utilizing a light illumination having a plurality of amplitudes, phases and polarizations of a plurality of wavelengths impinging from the object, obtaining modified illuminations corresponding to the light illumination, applying a modification to the light illumination thereby obtaining a modified light illumination, analyzing the modified light illumination, obtaining a plurality of amplitudes, phases and polarizations maps of the plurality of wavelengths, and employing the plurality of amplitudes, phases and polarizations maps for obtaining output representing the object's optical properties. An apparatus for analyzing optical properties of an object is also provided.
Abstract:
A method of detecting an explosive material, and an analyzer (100) and computer program products that may perform such methods. A method may include illuminating at least a portion of the material with light (200), and monitoring the temperature of the illuminated portion (210, 220a, 230a, 330). The power or location of the illuminating light may be altered (240, 340) in response to the monitored temperature. Raman spectral data are produced (250, 300) in response to Raman radiation emitted from the portion in response to the light. The composition of the material may be analyzed (250, 360) based on the Raman spectral data or generating an indication to an operator that the material cannot be safely analyzed (230a).
Abstract:
A hand-held spectrometer includes at least one indicator light and a processor configured to control the at least one indicator light to indicate a state of the hand-held spectrometer selected from a group consisting of a background scanning state, a ready-to-scan-sample state, a signal strength state, a fluorescence intensity state, a sample match state, a sample classification state, an error state, a data transfer state, a battery charge state, and a memory capacity state. The sample match state can be, for example, one of a positive match state, a mixture match state, a negative match state, and a match error state. In some embodiments, the error state can be at least one of a background error state, a user error state, and an instrument error state, or any combination thereof.
Abstract:
In a spectroscopic analysis system and a spectroscopic analysis method of the present invention, in determining a content percentage of a component contained in a measurement object based on a measurement object spectrum, one or more calibration curves for obtaining the content percentage of the component contained in the measurement object are selected out of a plurality of calibration curves generated based on reference spectra corresponding to a plurality of sections, into which a content percentage of each of a plurality of components is divided, and classified according to the sections using the measurement object spectrum and the reference spectra.
Abstract:
A light source and a method for its use in an optical sensor are provided, the light source including a resistively heated element. The light source includes a power circuit configured to provide a pulse width modulated voltage to the resistively heated element, the pulse width modulated voltage including: a duty cycle with a first voltage; and a pulse period including a period with a second voltage, wherein: the duty cycle, the first voltage, and the pulse period are selected so that the resistively heated element is heated to a first temperature; and the first temperature is selected to emit black body radiation in a continuum spectral range. Also provided is an optical sensor for determining a chemical composition including a light source as above.