Abstract:
A method and apparatus for remote, stand-off, and high efficiency spectroscopic detection of biological and chemical substances. The apparatus including an optical beam transmitter which transmits a beam having an axis of transmission to a target, the beam comprising at least a laser emission. An optical detector having an optical detection path to the target is provided for gathering optical information. The optical detection path has an axis of optical detection. A beam alignment device fixes the transmitter proximal to the detector and directs the beam to the target along the optical detection path such that the axis of transmission is within the optical detection path. Optical information gathered by the optical detector is analyzed by an analyzer which is operatively connected to the detector.
Abstract:
A micro-Raman spectroscopy system capable of making effective use of the unique analyzing capabilities of Raman spectroscopy and still capable of employing information about foreign materials obtained by a separate foreign material inspection system. The micro-Raman spectroscopy system uses a sample stage having a function of reproducing an image of a foreign material on a wafer under an optical microscope, based on positional information previously obtained from foreign materials by the separate foreign material inspection system. Furthermore, the micro-Raman spectroscopy system has a function of searching a built-in database for the substance of the foreign material on the wafer, using a Raman spectrum presently obtained from the foreign material. The system includes a Raman analysis optical system and a Raman spectrometer that are connected by optical fiber.
Abstract:
A hand-held material identification apparatus 10 uses a spectrograph and detector array detecting a Raman spectrum produced by a sample illuminated by a laser source to recognize a variety of materials with a command to recognition time cycle of about one second or less. The width of the spectrum detected by each detector in the array is less than ¼th the excitation source wavelength deviation to permit smoothing of the spectrum detected by the discrete spectral elements to eliminate pixel noise without loss of Raman spectral information. The Raman spectra are produced by materials illuminated by an inexpensive near-infrared multimode laser operated in a pulse mode to deliver between 0.05 and 0.5 joules of photon energy, with the Raman spectra being detected before any significant heating of the sample occurs. The identification apparatus 10 qualitatively determines the chemical composition of reinforced and unreinforced copolymers and composites such as ABS, polypropylene, talc-filled polypropylene, polycarbonate, PMMA, polyethylene, and PVC, from samples of different colors and textures with a high degree of success without the need for special positioning or sample preparation.
Abstract:
A method and apparatus for determination of fluoroorganic compounds in liquid, gaseous, or crystalline or amorphous solids is based on the detection of carbon-halogen bonds by laser Raman spectroscopy. The method and apparatus provide a general method for detecting and determination of halooorganic compounds. The method and apparatus are applicable in the pharmaceutical industry, in fluorinated drug research and manufacturing; in the medical and clinical studies of the effects of fluoroorganic compounds; in the environmental and agricultural studies and screening, in the analysis of water, soils and air contaminated with fluoroorganic compounds.
Abstract:
A material identification apparatus 10 uses a spectrograph and detector array detecting a Raman spectrum produced by a sample illuminated by a laser source to recognize a variety of materials. The Raman spectra are produced by materials illuminated by an inexpensive near-infrared multimode laser operated in a pulse mode to deliver between 0.05 and 0.5 joules of photon energy, with the Raman spectra being detected before any significant heating of the sample occurs. The identification apparatus 10 qualitatively determines the chemical composition of reinforced and unreinforced copolymers and composites such as ABS, polypropylene, talc-filled polypropylene, polycarbonate, PMMA, PVB, polyethylene, and PVC, from samples of different colors, layers, and textures with a high degree of success without the need for special sample preparation.
Abstract:
A method for producing a standard Raman spectrum of a sample. A source of incident radiation is provided. Means provide an incident beam and a monitor beam from the incident radiation. The incident beam is directed to the sample and a Raman beam is generated from the sample. Spectral data may be collected directly from the monitor beam and the Raman beam simultaneously. The occurrence of a frequency shift in the incident radiation is determined. One spectral measurement is made after the occurrence of the frequency shift, or a first spectral measurement is made before and a second spectral measurement is made after the frequency shift. One or more arithmetic calculations are applied to the single spectral measurement, or the second spectral measurement is subtracted from the first spectral measurement. One or more integral transforms are applied to the resulting spectral measurement data to produce the standard Raman spectrum.
Abstract:
Systems and methods are disclosed for detecting a nonlinear coherent field induced in a microscopic sample. The system includes in an embodiment, a first source for generating a first polarized electromagnetic field at a first frequency and a second source for generating a second polarized electromagnetic field at a second frequency that is different from the first frequency. The system further includes optics for combining the first polarized electromagnetic field and the second polarized electromagnetic field in a collinear fashion such that the difference in polarization angles is &phgr; wherein &phgr; is not equal to zero. The optics further direct the combined electromagnetic field toward a common focal volume. The system also includes a polarization sensitive detector for detecting a nonlinear coherent field that is generated responsive to the first and second polarized electromagnetic fields in the focal volume.
Abstract:
In order to improve a method of analyzing Si—Ge alloys, with which a Raman spectrum of a sample is recorded and Raman frequencies and Raman intensities of the Si—Si modes and the Si—Ge modes of the alloy layer are evaluated, such that any strain and any Ge portion in an alloy layer can be ascertained in a simple and as exact a manner as possible, it is provided for one or more spectrum contributions lying outside the Si—Ge modes and the Si—Si modes to be evaluated as oscillation modes.
Abstract:
The invention pertains to a process for determining the dye uptake of polyethylene terephthalate fibers in which the fibers are irradiated with high-intensity monochromatic light. A light-sensitive sensor is used to measure the Raman scattering and compare it with that of an earlier established model on the basis of Raman spectra of polyethylene terephthalate fibers of known composition and structure. A model is used to calculate the density, which constitutes a quantitative measure of the dye uptake. In the calculation use is made of measurement points from a number of regions in the spectral measuring region of 598 to 1900 cm−1.
Abstract:
This invention relates to a method and apparatus for the analysis of pharmaceutical specimens by nondestructively obtaining the molecular data for a chemical component on the surface or within the matrix of a pharmaceutical specimen.