Abstract:
The disclosure relates generally to methods and apparatus for spectral calibration of a spectroscopic system which includes a fiber array spectral translator. One embodiment relates to a method for obtaining a first image of a known substance using a photon detector and a fiber array spectral translator having plural fibers, wherein the first image comprises at least one pixel; providing a second image of the substance wherein the second image comprises at least one pixel; comparing the first image with the second image; and adjusting at least one pixel of the first image based on the comparison of images to thereby obtain an adjusted image.
Abstract:
Systems, methods, and apparatuses of low-coherence enhanced backscattering spectroscopy are described within this application. One embodiment includes providing incident light comprising at least one spectral component having low coherence, wherein the incident light is to be illuminated on a target object in vivo. An intensity of one or more of at least one spectral component and at least one angular component of backscattering angle of backscattered light is recorded, wherein the backscattered light is to be backscattered from illumination of the incident light on the target object and wherein the backscattering angle is an angle between incident light propagation direction and backscattered light propagation direction. The intensity of the at least one spectral component and the at least one backscattering angle of backscattered light is analyzed, to obtain one or more optical markers of the backscattered light, toward evaluating said properties.
Abstract:
Optical tomography systems that provide light of multiple distinct wavelengths from a plurality of sources are described. The systems direct light into mammalian tissue, and light from the mammalian tissue is collected at a plurality of reception points. Collected light from each reception point is separated according to its wavelength, and received by a photodetector to produce path attenuation signals representing attenuation along paths between the source locations and the reception points. An image construction system generates a tomographic image of the mammalian tissue from the path attenuation signals. One embodiment of an optical imaging system includes an optical coherence tomography-near infrared probe. The systems and methods may utilize a spectral derivative approach that provides insensitivity to the boundary and boundary artifacts in the signal, thereby improving the quality of the reconstructed images.
Abstract:
Optical tomography systems that provide light of multiple distinct wavelengths from a plurality of sources are described. The systems direct light into mammalian tissue, and light from the mammalian tissue is collected at a plurality of reception points. Collected light from each reception point is separated according to its wavelength, and received by a photodetector to produce path attenuation signals representing attenuation along paths between the source locations and the reception points. An image construction system generates a tomographic image of the mammalian tissue from the path attenuation signals. One embodiment of an optical imaging system includes an optical coherence tomography-near infrared probe. The systems and methods may utilize a spectral derivative approach that provides insensitivity to the boundary and boundary artifacts in the signal, thereby improving the quality of the reconstructed images.
Abstract:
Die Erfindung betrifft ein Fasergitter-Sensorsystem (1). Um ein konstruktiv besonders einfach aufgebautes Fasergitter-Sensorsystem zu schaffen, das eine verbesserte Auflösung bei der Bestimmung der spektralen Lagen der Bragg-Reflexe aufweist, wird ein Fasergitter-Sensorsystem (1) mit einer Lichtquelle (2), mit wenigstens einem mit der Lichtquelle (2) verbundenen Fasergitter (4, 5) aus Monomodefasern (7, 15) mit einer Vielzahl von Fasergittersensoren (6), mit einem mit dem Fasergitter (4, 5) verbundenen und ein Photodetektorelement (14) aufweisenden Detektor (8) zur spektralen Auswertung des von den Fasergittersensoren (6) reflektierten Lichtes und mit einem modenmischenden Element (11) zur Erzeugung von depolarisiertem und in seiner Strahlform an die Anforderungen des Photodetektorelements (14) angepasstem Licht am Detektoreingang (12) vorgeschlagen.
Abstract:
A spectroscopic device (10) comprising an optical fiber bundle (12) having its output end (12a) arranged in a vertical direction, a slit (16) provided so as to face the output end (12a) of the optical fiber bundle (12), a spectroscopic element arranging means (20) capable of arranging, on the optical path of light output from the output end (12a) of the bundle (12) and passed through the slit (16), a first diffraction grating (23) provided with a groove extending along a vertical direction at a specified line dispersion horizontally and a second diffraction grating (24) provided with a groove extending along a vertical direction at a line dispersion larger than that for the first diffraction grating (23) horizontally so as to enable switching between the diffraction gratings, and a photomultiplier (30) comprising a plurality of horizontally−arranged rows of anodes (53) extending along a vertical direction.
Abstract:
In order to easily carry out a non-destructive inspection of an object to be inspected at any work site by using a compact and handy type inspection instrument, a spectroscope assembly comprising an optical fiber shaping and holding member capable of arranging and maintaining the output end of an optical fiber bundle in such a way that the thickness is uniform and the bundle is flat, a packaged compact spectroscope in which a linear continuous variable interference filter, a micro-lens array, and a linear silicon array sensor are assembled in this order from the light input window toward the opposite side in a package in which a slit-like light input window through which the light from a linear light output surface enters is defined in a side surface facing the linear light output surface of the optical fiber shaping and holding member, and a positioning means for disposing the linear light output surface of the optical fiber bundle so as to face the light input window is provided in a body case together with a sensor head.
Abstract:
The present invention relates to systems of methods of measuring selected analytes in blood and tissue using Raman spectroscopy to aid in diagnosis. More particularly, Raman spectra are collected and analyzed to measure the concentration of dissolved gases and other analytes of interest in blood. Methods include in vivo transdermal and continuous monitoring as well as in vitro blood analysis. Furthermore, a compound parabolic concentrator to increase the amount of detected Raman signal is disclosed.