Abstract:
A method for remote scenes classification comprising the steps of (a) preparing a reference template for classification of the remote scenes via (i) classifying a set of reference scenes via a conventional classification technique for obtaining a set of preclassified reference scenes; (ii) using a first spectral imager for measuring a spectral cube of the preclassified reference scenes; (iii) employing a principal component analysis for extracting the spectral cube for decorrelated spectral data characterizing the reference scenes; and (iv) using at least a part of the decorrelated spectral data for the preparation of the reference template for remote scenes classification; (b) using a second spectral imager for measuring a spectral cube of analyzed remote scenes, such that a spectrum of each pixel in the remote scenes is obtained; (c) employing a decorrelation statistical method for extracting decorrelated spectral data characterizing the pixels; and (d) comparing at least a part of the decorrelated spectral data extracted from the pixels of the remote scenes with the reference template.
Abstract:
A spectral bio-imaging method for enhancing pathologic, physiologic, metabolic and health related spectral signatures of an eye tissue, the method comprising the steps of (a) providing an optical device for eye inspection being optically connected to a spectral imager; (b) illuminating the eye tissue with light via the iris, viewing the eye tissue through the optical device and spectral imager and obtaining a spectrum of light for each pixel of the eye tissue; and (c) attributing each of the pixels a color or intensity according to its spectral signature, thereby providing an image enhancing the spectral signatures of the eye tissue.
Abstract:
A method and apparatus for analyzing an optical image of a scene to determine the spectral intensity of each pixel thereof, by: collecting (20) incident light from the scene; scanning (22) the incident light; passing the scanned light through an interferometer (24) which outputs modulated light corresponding to a predetermined set of linear combinations of the spectral intensity of the light emitted from each pixel; focusing the light ouputted from the interferometer on a detector array (26); and processing (28) the output of the detector array to determine the spectral intensity of each pixel thereof.
Abstract:
A light microscope comprises a light source (14) and a first acousto-optic tunable filter (16) responsive to the light source for producing two light streams of different polarization. A control circuit (17) is provided for tuning the first filter to a plurality of frequencies. A mechanism, such as steering optics (24, 25, 26, 27), is provided for combining the two light streams into a combined light stream. Input optics (29) focus the combined light stream. A condenser (30), such as a darkfield condenser, receives the focused, combined, light stream and projects it onto a sample held in a sample plane (31). A second acousto-optic tunable filter (38) is responsive to light from the sample. A second control circuit (17) is provided for tuning the second acousto-optic filter (38) to a plurality of frequencies. The light from the second acousto-optic tunable filter (38) may be captured and stored for future processing.
Abstract:
A two-dimensional imaging system comprises an acousto-optic tunable filter (38) for receiving light at an input end thereof and outputting light at an output end thereof. A control circuit (17) is provided for tuning the filter (38). A prism (96) is responsive to the light output by the tunable filter (38). The prism (96) is oriented at an angle with respect to the filter (38) to compensate for dispersion of the output light caused by the tunable filter (38). An output device such as a lens (36) or camera (40) is responsive to the prism (96) for forming a two-dimensional image.
Abstract:
A multiband IR adjunct (MIRA) sensor to spectroscopically determine the content and the concentration of chemical composition of a targeted object, includes a sensor housing, a first front optics in a first optical channel, a second front optics in the first optical channel, an acousto-optic tunable filter (AOTF), a photo detector (PD), a set of back optics in the first optical channel that focuses polarized narrow-band light beams received from the AOTF device onto the PD, the PD converting the polarized narrow-band light beams into an electrical signal, and a data acquisition unit signal-connected to the PD, the data acquisition unit collecting the electrical signals. Multiple optical channels can be provided within the housing to analyze UV/VIS/near infrared (NIR), short-wavelength infrared (SWIR), mid-wavelength infrared (MWIR), and LWIR wavelength ranges respectively.
Abstract:
The present technology provides methods, systems, and apparatuses to achieve high throughput and high speed acquisition of partial wave spectroscopic (PWS) microscopic images. In particular, provided herein are high-throughput, automated partial wave spectroscopy (HT/A-PWS) instruments and systems capable of rapid acquisition of PWS Microscopic images and clinical, diagnostic, and research applications thereof.
Abstract:
Tunable filters can use Fano metasurface designs having extremely narrow transmission bands. The Fano metasurface can comprise dielectric or semiconductor materials and can produce transmission bands with quality factors well in excess of 1000—at least a factor of 50 greater than typical metamaterial-based infrared resonances. Numerical simulations of these metasurfaces show that the spectral position of the passband can be changed by slightly changing the position of a small dielectric perturbation block placed within the near-field of the resonator by using simple electromechanical actuation architectures that allow for such motion. An array of independently tunable narrowband infrared filters can thereby be fabricated that only requires deep-subwavelength motions of perturbing objects in the resonator's near-field.
Abstract:
An apparatus comprising: a probe configured to be pushed into a subsurface soil environment; a transparent window mounted to a side of the probe; a broad-spectrum light source mounted within the probe and positioned such that when the light source is activated broad-spectrum light exits the window; a tunable optical filter mounted within the probe and positioned so as to receive, as an input, light reflected back through the window from the subsurface soil environment, wherein the filter comprises a plurality of settings at each of which the filter is configured to output light within a given wavelength range to the exclusion of other wavelength light ranges; and an imaging system disposed within the probe and configured to capture an image of the output light from the filter at each of the settings at a given depth of the probe in the subsurface soil environment.
Abstract:
The invention relates to a microscope having an acousto-optic apparatus (13) that, with a mechanical wave that is characterized by a preferably adjustable frequency, removes from a polychromatic and collinear detected light bundle (18) portions of illuminated light, scattered and/or reflected at a sample, having an illuminating light wavelength associated with the frequency. The microscope is notable for the fact that a crystal (30) of the acousto-optic apparatus in which the mechanical wave propagates, and the propagation direction of the mechanical wave, are oriented relative to the detected light bundle incident into the crystal in such a way that the acousto-optic apparatus deflects, with the mechanical wave, both the portion of the detected light bundle having the illuminating wavelength and a first linear polarization direction, and the portion of the detected light bundle having the illuminating wavelength and a second linear polarization direction perpendicular to the first polarization direction, and thereby removes them from the detected light bundle.