Abstract:
A reflective optics system that preferably requires the presence of both convex and a concave mirrors that have beam reflecting surfaces, the application of which achieves focusing of a beam of electromagnetic radiation onto a sample, (which can be along a locus differing from that of an input beam), with minimized effects on a polarization state of an input beam state of polarization based on adjusted angles of incidence and reflections from the various mirrors involved.
Abstract:
Methods and apparatus for remote, passive detection of underwater objects using combined spectral and polarimetric imaging. In one example, a tunable multi-band spectro-polarimeter includes an imaging detector array that receives electromagnetic radiation from a viewed scene, a plurality of tunable spectral filters configured to filter the electromagnetic radiation into at least first and second spectral bands, and a plurality of polarization filters configured to filter each of the first and second spectral bands into at least two different polarization states, a first region of the detector array receiving the first spectral band and producing first polarimetric image data, and a second region of the detector array simultaneously receiving the second spectral band and producing second polarimetric image data, and a controller that receives and processes the first and second polarimetric image data to detect a target object in the viewed scene.
Abstract:
A system comprises: a polarization state aligner (PSA) comprising: an input port; a first polarization beam splitter (PBS) coupled to the input port; a first phase shifter (PS) coupled to the first PBS; a first polarization rotator (PR) coupled to the first PBS; a first beam splitter (BS) coupled to the first PS and the first PR; a first output port coupled to the first BS; and a second output port coupled to the first BS.
Abstract:
A method using Long Wave Infrared Imaging Polarimetry for improved mapping and perception of a roadway or path and for perceiving or detecting obstacles comprises recording raw image data using a polarimeter to obtain polarized images of the roadway or area. The images are then corrected for non-uniformity, optical distortion, and registration. IR and polarization data products are computed, and the resultant data products are converted to a multi-dimensional data set for exploitation. Contrast enhancement algorithms are applied to the multi-dimensional imagery to form enhanced object images. The enhanced object images may then be displayed to a user, and/or an annunciator may announce the presence of an object. Further, the vehicle may take evasive action based upon the presence of an object in the roadway.
Abstract:
A reflective optics system that preferably requires the presence of both convex and a concave mirrors that have beam reflecting surfaces, the application of which achieves focusing of a beam of electromagnetic radiation onto a sample, (which can be along a locus differing from that of an input beam), with minimized effects on a polarization state of an input beam state of polarization based on adjusted angles of incidence and reflections from the various mirrors involved.
Abstract:
Disclosed are a light polarization state detection apparatus, a detection method and a light polarization state modulation method. The light polarization state detection apparatus comprises a lens with a variable birefringence feature as an optical phase modulator, a polarizer as a SOP analyzer, a plurality of common lenses and a CCD as imaging devices, and a data processing and displaying unit. The SOP detection apparatus uses special birefringence distribution of birefringence optical elements such as a GRIN lens to obtain the Stokes parameters of light to be measured by CCD in a single frame imaging, and can rapidly accurately measure the SOP. The SOP detection apparatus is simple in structure, lower in cost without containing any motion parts and electrical modulation devices, and is a fully static full Stokes parameters SOP detection apparatus. The light polarization state modulation apparatus comprises a GRIN lens with a variable birefringence feature. The modulation method is continuous in each position of a modulation aperture, rich in modulation variety and low in cost.
Abstract:
Disclosed is a urine sample analyzing method comprising: flowing a measurement specimen prepared by mixing a urine sample and reagent through a flow cell; irradiating epithelial cells in the measurement specimen flowing through the flow cell with linearly polarized light and thereby producing scattered light; detecting a change of polarization condition of the scattered light produced by each of the epithelial cells; and classifying the epithelial cells into at least two types based on the change of polarization condition.
Abstract:
An intensity-independent optical computing device and method for performing multivariate optical computing based on changes in polarization of the reflected and/or transmitted electromagnetic radiation to thereby determine sample characteristics.
Abstract:
According to an aspect of the invention, it is provided a process of detection of light comprising: - a step of flowing an electric current through at least a first dielectric junction, said first dielectric junction comprising at least a first metallic layer extending along a first reference plane and a second metallic layer extending parallel to said first reference plane, said first and second metallic layers being separated from each other by a dielectric layer ensuring non-ohmic conduction between said first and second metallic layers; - a step of measuring the electric resistance of the first dielectric junction; - a step of determining the presence or the absence of light by using the measured electric resistance of the first dielectric junction. According to another aspect of the invention, it is provided a process of characterization of the degree to which detected light is polarized along a first spatial direction and/or along a second spatial direction and/or along a third spatial direction, using a device at the nanometre scale. This enables the detection of the orientation of the incoming light.