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| Number | Title | Issue Date |
| 4365896 | Optical attenuation monitor system and method Light operative apparatus is located inside electro-optical instrument viewing window, such as that used by a radiation pyrometer or dimensional gage in a steel mill environment, to detect and compensate for optically attenuating objects which may accumul... | 12/28/1982 |
| 4362388 | Remote measurement of concentration of a gas specie by resonance absorption The concentration of a selected gas specie at a situs determined by directing a laser beam at the situs, the beam including a wavelength within the resonance absorption band of the gas specie, and measuring the intensity of the laser beam energy scattered... | 12/07/1982 |
| 4320975 | Passive smoke plume opacity monitor In the smoke opacity monitor disclosed herein, a measurement of opacity is obtained by measuring the proportion of polarized light from the background sky which is detectable through the smoke plume. Compensation and normalization is provided to minimize ... | 03/23/1982 |
| 4318180 | Method and apparatus for indicating the size distribution of particles in a flowing medium Methods and apparatus for determining the particle size distribution with respect to selected fraction classes in the direction of flow of a medium are provided in accordance with the teachings of the present invention. A plurality of measuring configurat... | 03/02/1982 |
| 4311388 | Visibility measuring device A device for measuring the visibility, or diffusion coefficient, of atmosre air, including a light source for directing light onto a volume of air and a receiver capable of measuring the flow of light diffused by the volume of air. The source is surround... | 01/19/1982 |
| 4290695 | Method and apparatus for measurement of transmittance and scatter of light in water Precise quantification of turbidity is obtainable through multiple determinations of the light attenuation coefficient of the particulate-bearing medium at a plurality of path lengths in the attenuating medium, and through multiple determinations of the s... | 09/22/1981 |
| 4280625 | Shade determination The invention relates to the measurement of the shade of a particle. The particle is illuminated with light of variable intensity and viewed against a background level of illumination. A measurement is made of the ratio of time for which the intensity of ... | 07/28/1981 |
| 4268171 | Method determining concentration in rate nephelometric immunochemical analysis A method of determining the concentration of antigen in a rate nephelometric immunochemical analysis wherein an observed maximum rate of change of a nephelometric signal is used to determine the antigen concentration by employing a mathematical expression... | 05/19/1981 |
| 4246060 | Plasma development process controller End point detection in developing photoresist is accomplished by monitoring the output of a photodetector and sensing a plateau in the output.... | 01/20/1981 |
| 4232967 | Instrument for measuring sizes and quantity of particles in fluid medium According to the invention, the instrument for measuring the sizes and quantity of particles in a fluid medium comprises a light-sensitive device which converts light scattered by particles in a flow of a fluid medium which crosses a beam emitted by a lig... | 11/11/1980 |
| 4204837 | Method of rate immunonephelometric analysis A method of determining the need for post-addition of antigen or antibody to an antigen-antibody reaction to ascertain whether the reaction is in an antigen excess or an antibody excess condition. The time rate of change of a nephelometric signal develope... | 05/27/1980 |
| 4193692 | Method and apparatus for the optical measurement of the concentration of a particulate in a fluid An optical concentration measuring apparatus and method which provides an output signal which is a substantially linear function of the concentration. The apparatus includes a chamber for containing a fluid sample and a source of optical radiation which d... | 03/18/1980 |
| 4174952 | Immunoassay by light scattering intensity anisotropy measurements Method and apparatus for determining the concentration of any of a wide range of antigen or antibody molecules with a high degree of specificity, accuracy and sensitivity. Antigen or antibody concentration is determined by effecting an agglutination react... | 11/20/1979 |
| 4157871 | System for rate immunonephelometric analysis A system for the detection of precipitate-forming antigens by means of the reaction with their corresponding antibodies is disclosed. The reaction of precipitate-forming antigens with their respective antibodies produces a precipitate in proportion to eit... | 06/12/1979 |
| 4155651 | Apparatus for measuring the total mass of particles suspended in a fluid Optical apparatus for measuring the amount of light reflected and/or scattered by particles suspended in a fluid, such as scrubber carryover appearing as a spray of dispersed water droplets. The amount of light reflected and/or scattered is an indication ... | 05/22/1979 |
| 4140902 | Device for measurement of hair-like particulate material Apparatus for the measurement of hair-like particles, such as measurement of the amount of asbestos fiber in air. Apparatus including a source of a polarized beam of radiation directed to a scattering zone and a detector for detecting radiation of the bea... | 02/20/1979 |
| 4128335 | Condensation nuclei counter with automatic ranging A condensation nuclei counter for measurement of the concentrations of Aitken particles in gases by measurement of light scattered in a cloud chamber by water droplets formed on the particles in successive samples of a gas wherein the counter provides for... | 12/05/1978 |
| 4116775 | Machine and process for reading cards containing medical specimens Medical specimens suspected of containing certain microorganisms are introduced into cards containing wells having culture media therein. A reduction in the light transmitting characteristics of any well indicates the presence of a microorganism. Each wel... | 09/26/1978 |
| 4105334 | Optical detector An analyzer and method for measuring the properties of a liquid sample, such as the monitoring of water streams for oil detection as in ballast water monitoring onboard tankers, wherein a sample stream is passed through a nonreflective chamber where it is... | 08/08/1978 |
| 4103997 | Light scattering type smoke detector A light scattering type smoke detector effectively sensitive both to white and black smokes is provided. A wave length λ of an incident light from a light source and a scattered light receiving angle θ defined by the direction of the incident light and ... | 08/01/1978 |
| 4097149 | Quantitative protein analysis by immunodiffusion Methods are described by which immunochemical procedures such as immunodiffusion and immunoelectrophoresis can be used to provide quantitative measurement of the concentration of individual proteins in fluids such as serum, spinal fluid, tissue extracts a... | 06/27/1978 |
| 4070113 | Coherent optics blood cell classification system A system for classifying the various major types of blood cells is provided wherein blood cells are passed before a laser beam. The redirected light energy passing through the cell is applied to a detector array which provides a voltage spectrum represent... | 01/24/1978 |
| 4053229 | 2°/90° Laboratory scattering photometer A scattering photometer for measuring the light scattered by particles in a hydrosol at substantially 2° and 90° simultaneously. Light from a source is directed by a first optical system into a scattering cell containing the hydrosol under study. Light ... | 10/11/1977 |
| 4047815 | Measurement of standard visual range For determining the standard visual range by determining the relation between a measured signal and a reference signal, the two signals are processed purely electronically by amplifying one of the signals in an amplifier having a digitally programmed ampl... | 09/13/1977 |
| 4043669 | Light scattering test apparatus An apparatus for measuring light scattered at various angles from a sample of molecules in solution, having a plurality of conical reflectors mounted on a turret assembly. The turret assembly is positioned in a temperature controlled tank. A laser beam is... | 08/23/1977 |
| 3952583 | Apparatus and method for the remote detection of vibrations of diffuse surfaces Apparatus and method for the remote detection of vibrations of diffuse surfaces. A beam of coherent light incident on a vibrating diffuse surface is scattered. A photodetector sees the scattering as a time-varying intensity distribution related to the vib... | 04/27/1976 |
| 3942897 | Method and apparatus for detecting solid substances contained in liquid Method and apparatus for detecting and measuring solid alien substance(s), which may adversely exist in a liquid contained in a transparent container, are provided. Light is applied to the container as it is rapidly rotated and then suddenly stopped to ca... | 03/09/1976 |
| 3936192 | Optical fluid contamination and change monitor An optical oil monitor that measures particle contamination in oil by passing light through an oil sample and picking up the light that is scattered at 90° by the particle contaminaton and measures chemical breakdown by the attenuation of the light passi... | 02/03/1976 |
