Abstract:
A spectrometer for sampling interferograms in two dimensions offering a large spectral band and high spectral resolution with a relative compactness. The spectrometer includes a refracting surface, an array of detecting elements and an array of diffusion elements capturing means at the refracting surface of an interferogram delivered from two interference beams (F1, F2) and forming interference lines parallel to each other along the transverse axis (Ox) of the interferogram within the plane (xOy) of the refracting surface, the array of detection elements being parallel to the plane of the refracting surface and arranged to detect the spatial distribution of the interferogram, wherein the array is a two-dimensional array over an entirety of which the detections elements are disposed equidistantly, and wherein interference lines exhibit an angular shift with the capturing means.
Abstract:
A system and method for analyzing unknown materials on surfaces including, but not limited to, chemical materials, biological materials, hazardous materials, drug materials, and non-threat materials using SWIR and/or extended range SWIR hyperspectral and spectroscopic techniques. A system comprising a collection optics, a tunable filter, and a first detector for generating a test data set representative of the unknown sample. A second detector, comprising a visible imaging device, may be configured to operate in a scanning mode to locate areas of interest for further interrogation using SWIR. A method comprising generating a SWIR test data set representative of the unknown sample and analyzing the unknown sample to detect, identify and/or distinguish an unknown material as a known material. This analysis may be achieved by comparing the test data set to a reference data set using at least one chemometric technique.
Abstract:
In one aspect, a spectrometer insert is provided. The spectrometer insert includes: an enclosed housing; a first transparent window on a first side of the enclosed housing; a second transparent window on a second side of the enclosed housing, wherein the first side and the second side are opposing sides of the enclosed housing; and a sample mounting and heating assembly positioned within an interior cavity of the enclosed housing in between, and in line of sight of, the first transparent window and the second transparent window. A method for using the spectrometer insert to locally heat a sample so as to measure temperature-dependent optical properties of the sample is also provided.
Abstract:
A hyperspectral imaging system having an optical path. The system including an illumination source adapted to output a light beam, the light beam illuminating a target, a dispersing element arranged in the optical path and adapted to separate the light beam into a plurality of wavelengths, a digital micromirror array adapted to tune the plurality of wavelengths into a spectrum, an optical device having a detector and adapted to collect the spectrum reflected from the target and arranged in the optical path and a processor operatively connected to and adapted to control at least one of: the illumination source; the dispersing element; the digital micromirror array; the optical device; and, the detector, the processor further adapted to output a hyperspectral image of the target. The dispersing element is arranged between the illumination source and the digital micromirror array, the digital micromirror array is arranged to transmit the spectrum to the target and the optical device is arranged in the optical path after the target.
Abstract:
The invention relates to a polyamide comprising at least one repeat unit corresponding to the general formulation: X·Y in which: X represents a cycloaliphatic diamine and Y represents an aliphatic dicarboxylic acid chosen from dodecanedioic (C12) acid, tetradecanedioic (C14) acid and hexadecanedioic (C16) acid, characterized in that said dicarboxylic acid comprises organic carbon of renewable origin, determined according to Standard ASTM D6866. The invention also relates to a composition comprising this polyamide and also to the use of this polyamide and of such a composition.
Abstract:
A method and apparatus are provided that interrogate, receive, and analyze full emission spectra for at least one fluorescence excitation wavelength and for at least one reflectance measurement to determine tissue characteristics and correlate same to photographic images. Further, the system and method accomplish this measurement rapidly by increasing the light throughput by integrating optics into a hand held unit and avoiding the need for a coherent fiber optic bundle being used. The method includes illuminating a first portion of a target tissue with optical energy, forming a first image of the target tissue, illuminating a second portion of the target tissue with optical energy, performing spectroscopic measurements on optical energy reflected and/or emitted by the target tissue upon illumination of the second portion of the target tissue with optical energy, and determining tissue characteristics of the target tissue based on the results of the spectroscopic measurements.
Abstract:
Embodiments of the invention provides methods and systems for synthesizing optical signals with high frequency stability. Using a set of external optical signal manipulators and control systems, embodiments of the invention enhance the resolution of any frequency reference and thereby alleviates the needs for ultra-high-Q cavities in frequency-stable optical signal synthesis. The invention consequently improves the performance of any optical signal generator by a substantial margin, while maintaining the system complexity and power dissipation at levels comparable to the original systems.
Abstract:
According to various embodiments, a Raman spectroscopy method is provided for reduction of background fluorescence signal. The method may utilize a high speed optical chopper configured to periodically interrupt the laser light beam between the laser light source and the sample; and using the high speed optical chopper to provide a synchronized time-gated optical window for receiving mostly Raman signal while rejecting most or some of the fluorescence signal transmitted from the sample in response to the laser light beam before reaching the sensor
Abstract:
Color calibration of color image rendering devices, such as large color displays, which operate by either projection or emission of images, utilize internal color measurement instrument or external color measurement modules locatable on a wall or speaker. A dual use camera is provided for a portable or laptop computer, or a cellular phone, handset, personal digital assistant or other handheld device with a digital camera, in which one of the camera or a display is movable with respect to the other to enable the camera in a first mode to capture images of the display for enabling calibration of the display, and in a second mode for capturing image other than of the display. The displays may represent rendering devices for enabling virtual proofing in a network, or may be part of stand-alone systems and apparatuses for color calibration. Improved calibration is also provided for sensing and correcting for non-uniformities of rendering devices, such as color displays, printer, presses, or other color image rendering device.
Abstract:
Apparatus and systems, preferably using UV spectroscopy, for the dynamic and continuous detection and quantification of a range of chemicals, particularly pollutants, in the environment, and to the production of a real-time display or map to display chemical levels in the environment are provided. By providing data packets which combine details of pollutants in the atmosphere with very accurate position and temporal information, and real-time map of pollution is provided.