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| Number | Title | Issue Date |
| 7843560 | Stable turbidity calibration standards The present invention relates to a turbidity calibration standard comprising: a number of from 1 to 5 sequentially-interfaced layers, wherein each layer independently comprises a light-permeable polymer or light-permeable interpolymer; a measured light transmission ... | 11/30/2010 |
| 7742164 | Luminescence reference standards The present teachings provide for systems, and components thereof, for detecting and/or analyzing light. These systems can include, among others, optical reference standards utilizing luminophores, such as nanocrystals, for calibrating, validating, and/or monitoring... | 06/22/2010 |
| 7518719 | Contaminant analyzer for fuel A method and apparatus for detecting contaminants in hydrocarbon fuel are disclosed, wherein a fuel analyzer includes a flow sensor to facilitate an automatic start up and shut down of a fuel analysis, and a calibration standard to facilitate an inline calibration o... | 04/14/2009 |
| 7201875 | Fixed mounted sorting cuvette with user replaceable nozzle A flow cell and flow cytometer in which a nozzle at the end of a flow channel is disposed on a removable substrate held at a registered location on a flow cell. Other elements including illumination optics, light collection optics, and the flow cell may then be posi... | 04/10/2007 |
| 7162057 | Apparatus for and method of monitoring particulate material in a fluid Apparatus for monitoring particulate material in a fluid comprising a passageway (17), through which fluid to be monitored is passed, at least a portion (24) of the boundary of the passageway (17) being translucent to enable radiation to pass th... | 01/09/2007 |
| 6629449 | Bubble measuring instrument and method Method and apparatus are provided for a non-invasive bubble measuring instrument operable for detecting, distinguishing, and counting gaseous embolisms such as bubbles over a selectable range of bubble sizes of interest. A selected measurement volume in w... | 10/07/2003 |
| 6327889 | Device and method for introducing surrogates, particularly metal surrogates, into an exhaust stream, for simulating an exhaust stream, and for establishing a standardized source A convenient apparatus and method for inserting surrogate metal-entraining aerosols into exhaust stacks for the purpose of realistic dynamic testing of an emissions monitor. The aerosols contain elements required to be detected by the monitor. The 14 meta... | 12/11/2001 |
| 6088098 | Calibration method for a laser-based split-beam method A method for the quantitative acquisition of flow patterns in fluid flows in which a medium (e.g., a gas or a liquid) and the particles contained therein and carried in the flow are set in motion in a transparent flow object. The method provides that a fl... | 07/11/2000 |
| 5912737 | System for verifying the calibration of a turbidimeter A system is described for verifying the calibration of a turbidimeter having a light source and a detector for scattered light. A first polarizer is positioned in the path of the light beam, and a second polarizer is positioned between the first polarizer... | 06/15/1999 |
| 5747667 | Particle counter verification method A method is described for rapid, simple and economical verification of the accuracy of the determination of an on-line particle counter without disconnecting it from a stream of liquid being tested. The method involves injecting a known volume of a liquid... | 05/05/1998 |
| 5741441 | Non-liquid scatter standard A non-liquid scatter standard for use in nephelometry and turbidimetry systems which comprises a clear silicon rubber gel in which an effective light scattering amount of inorganic particles are suspended. The particles have an index of refraction greater... | 04/21/1998 |
| 5596405 | Method of and apparatus for the continuous emissions monitoring of toxic airborne metals A portable apparatus for continuous real-time measurement of airborne met, comprising an isokinetic sampler, a sample line, a sampling interface device, a pump, and an inductively coupled plasma atomic emission spectrometry (ICP-AES). A method for measur... | 01/21/1997 |
| 5568266 | Colorimeter and colorimetrical control device A colorimeter is provided in which a measuring pipe diverts a sample of a substance off of a production line into a measuring chamber. A series of cut-off valves control the quantity of the sample accumulated in the measurement zone to ensure sufficient a... | 10/22/1996 |
| 5506677 | Analysis of wear metals in perfluorinated fluids Soluble metal complexes for use as standards in wear metal analysis of PFPAE fluids are provided. These standards are the metal complexes of 2,2-dimethyl-6,6,7,7,8,8,8,-heptafluoro-3,5-octanedione (HFOD). These complexes are soluble in PFPAE's to at least... | 04/09/1996 |
| 5467187 | Automatic calibration system for turbidimeters using a pulsing fluid flow to reciprocate a standard in a cuvette An automatic calibration system is disclosed for an apparatus that measures the presence of s selected component in a test liquid sample. The system includes a transparent test liquid holder having an inlet and outlet for conducting a test liquid into and... | 11/14/1995 |
| 5328852 | Analytical assay A method for determining the amount of an analyte in a sample fluid utilizing an assay element which comprises at least one reagent layer. The assay method includes the steps of optically reading a signal producing species, e.g., a fluorescent label, a fi... | 07/12/1994 |
| 5159403 | Flow cell mechanism in flow imaging cytometer A flow imaging cytomer for imaging the dimensions and shapes of particle components in a flow of a specimen solution has a slender filament serving as a focusing reference provided in a flat imaging zone through which the specimen solution flows in order ... | 10/27/1992 |
| 5139332 | Optical emission spectrochemical standard for metals and alloys A standard test specimen for optical emission spectrochemical analysis is prepared by molding into the specimen body finely divided particles consisting essentially of the metal or metal alloy to be analyzed without melting the same and preferably by plas... | 08/18/1992 |
| 5123738 | Standard substance for optical calibration and method of making same A standard substance for optical calibration is produced by mixing a proportion of a scattering substance with a first silicone liquid. The optical properties of the first liquid are measured and a further amount of the first liquid is added to the origin... | 06/23/1992 |
| 5093234 | Method of aligning, compensating, and calibrating a flow cytometer for analysis of samples, and microbead standards kit therefor A kit of highly uniform size microbead standards for flow cytometer alignment, compensation, and/or calibration, comprising a blank microbead population and/or an auto-fluorescent microbead population, together with two or more series of calibrated microb... | 03/03/1992 |
| 5089416 | Method of use of non-fluorescent particles to determine fluorescence threshold of a flow cytometer relative to the autofluorescence of samples A qualitative and quantitative method of determining the fluorescence threshold of an instrument and of determining whether the instrument is sensitive enough to measure the autofluorescence of a sample. The method utilizes non-fluorescent particles such ... | 02/18/1992 |
| 5084394 | Method for corrective calibration of a flow cytometry using a mixture of fluorescent microbeads and cells The use of a combination of calibrated microbead populations with one or more calibrated biological cell populations to correct calibration of a flow cytometer for size and fluorescence intensity determinations of biological cell samples. The use of calib... | 01/28/1992 |
| 5073497 | Microbead reference standard and method of adjusting a flow cytometer to obtain reproducible results using the microbeads A flow cytometer reference standard containing a highly uniform microbead population, wherein each microbead has the same multiple fluorescent labels as the other microbeads and as the samples to be measured. Target conditions are set for the sample after... | 12/17/1991 |
| 4832488 | Method for correction of calibration curve in dry analytical process A method for correction of calibration curve in a dry analytical process for quantitative analysis of analyte in a liquid sample such as blood is disclosed. In the method, a calibration curve which has been previously determined for analysis of the analyt... | 05/23/1989 |
| 4767206 | Calibration method for flow cytometry using fluorescent microbeads and synthesis thereof A method of calibrating a flow cytometer is based on a set of highly uniform microbeads associated with a fluorescent dye in such a way that the microbeads have the same excitation and emission spectral properties as the samples which are to be measured. ... | 08/30/1988 |
| 4669542 | Simultaneous recovery of crude from multiple zones in a reservoir A method for simultaneous recovery of crude oil from multiple zones in a reservoir is disclosed wherein multiple wells, each in fluid communication with at least two hydrocarbon zones separated by an impermeable barrier, are used to produce oil in an enha... | 06/02/1987 |
| 4640621 | Transmissometer and optical elements therefor A transmissometer includes electronic shutters for interrupting the transmitted and reference light beams at selected locations and at selected time intervals for establishing the various modes of operation of the transmissometer. The electronic shutters ... | 02/03/1987 |
| 4434647 | Dynamic spot calibration for automatic particle counters The invention is a dynamic spot calibration system (60) and process for calibrating, both for sizing and counting, an automatic particle counter (APC) (42). The APC includes a sensor (38) which uses a light source that focuses through a sensing window (48... | 03/06/1984 |
| 4380392 | Method and apparatus for calibration of instruments serving to count and to determine the size of particles suspended in dispersion medium An instrument for counting and determining the size of particles suspended in a dispersion medium is calibrated by setting a certified particle contained in the dispersion medium in motion so that the particle repeatedly crosses the sensing zone of the in... | 04/19/1983 |
| 4367950 | Combined aerosol monitor and calibrateable light ray scattering reference rod A calibrateable light ray scattering reference rod utilized in a light scattering dust monitor. This light ray rod scatters an amount of light equivalent to a given concentration of dust. Adjustability is provided so that several concentrations of dust ca... | 01/11/1983 |
| 4331862 | Method for calibrating a particle counting machine and a calibration standard therefor A calibration method and standard for calibrating particle counting instruments such as blood platelet counting instruments in which the particles have a distribution of sizes, wherein the method includes the following steps performable in any order. A fi... | 05/25/1982 |
| 4291981 | Reference scatter for use in the correction of scattering photometers A reference scatterer for use in the correction of scattering type photometers having a reference glass scatterer main body with microcrystals therein to split the phase of incident light which is housed within a vessel with a clearance between the two. T... | 09/29/1981 |
| 4247783 | Photoelectric converter of sizes of particles employing calibration light pulses with increased stability A photoelectric converter of sizes of particles contained in a flow of gas to electric pulses comprises a chamber with a means for directing an aerosol flow into and from said chamber optically connected to an illumination means which forms a convergent l... | 01/27/1981 |
| 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 |
| 4144458 | Smoke detector with test means for simulating a predetermined concentration of smoke A smoke detector of the photo-electric type having a photo-responsive device viewing a volume illuminated by a light beam, in which a test member is provided for being temporarily positioned in the light beam so that one side of said member is exposed to ... | 03/13/1979 |
| 4144459 | Smoke detector with test means for simulating a predetermined percentage of smoke A smoke detector of the photo-electric type having a photo-responsive device viewing a volume illuminated by a light beam, in which a test member is provided for being temporarily positioned in the light beam so that one side of said member is exposed to ... | 03/13/1979 |
| 4135821 | Calibration of optical particle-size analyzer This invention relates to a system for the calibration of an optical particle-size analyzer of the light-intercepting type for spherical particles, wherein a rotary wheel or disc is provided with radially-extending wires of differing diameters, each wire ... | 01/23/1979 |
| 4111560 | Method and apparatus for determining a property of a given substance In order to determine a property of a given substance, the latter and a reference substance are alternately fed, by a suitable pump, for example, into and through a receiver in which each substance remains for a given time increment before the other subst... | 09/05/1978 |
| 4093867 | Apparatus for automatically calibrating and testing smoke detectors Apparatus for automatically calibrating smoke detectors within desired ranges of values of smoke obscuration, and thereafter retesting them for valid calibration; in accomplishing this the smoke obscuration is continuously increased at a predetermined uni... | 06/06/1978 |
| 3997271 | Device for calibrating a transmissometer This specification discloses a device for resetting the zero calibration of an opacity sensing meter (transmissometer) made up of a light source which may be located on one side of a smokestack, and a sensing element located on the other side of the smoke... | 12/14/1976 |
