Noninvasive method and apparatus for characterizing biological materials
November 29, 2011. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3782827 Method and system for non-invasive detection of zinc protoporphyrin in erythrocytes Method and apparatus for detecting the presence of caries in teeth using visible light Spectroscopic analyzer system for examining intravital tissue Device for the ocular determination of any discrepancy in the luminescence capacity of the surface of a tooth for the purpose of identifying any caried area on the surface to the tooth Method and apparatus for spectral transmissibility examination and analysis Compact temporal spectral photometer Measurement of variable fluorescence of plants Image-forming process Visible fluorescence spectral diagnostic for laser angiosurgery InventorsApplicationNo. 434799 filed on 11/13/1989US Classes:356/446, With diffusion356/318, Monochromatic (e.g., laser)356/448, By comparison600/477With comparison means (e.g., ratio of or comparison to a standard)ExaminersPrimary: Rosenberger, Richard A.Assistant: Pham, Hoa Q. Attorney, Agent or FirmInternational ClassG01N 021/47AbstractBiological material is characterized by illuminating the material with a beam of light, measuring light scattered from the material and then determining the condition of the material using the measurements. In one embodiment the angular line shape of the backscattered light is measured and then used to determine the scattering mean free path (1) and the absorption length (la) of the light scattered in the material to find out the condition of the material. These values so obtained are compared to values for a material whose condition is normal to determine if the condition of the material being examined is abnormal or normal. In another embodiment the temporal profile of the scattered pulse is used to determine (1) and (1a). The apparatus includes a laser for illuminating a section of material to be characterized, a streak camera for detecting light scattered from the material, a video camera for imaging the output of the streak camera, a computer for processing the output of the video camera to determine (1) and (1a) and a monitor for displaying the results to determine if the condition of the material being examined is normal or abnormal.Field of SearchOF LIGHT REFLECTION (E.G., GLASS)With diffusion With modulation (e.g., flicker beam) By comparison FOR SIZE OF PARTICLES By particle light scattering BY PARTICLE LIGHT SCATTERING With photocell detection At right angles to the light beam (e.g., nephelometer) At variable angle to the light beam For light comparison means Of back-scattered light Using plural photocells PLURAL TEST FOR OPTICAL FIBER OR WAVEGUIDE INSPECTION By light Monochromatic (e.g., laser) Included with sample excitation FOR LIGHT TRANSMISSION OR ABSORPTION Control of pulse characteristics | |
