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| Number | Title | Issue Date |
| 7724356 | Apparatus for measuring differential refractive index The invention provides an apparatus for measuring the differential refractive index for liquid chromatography which greatly improves the sensitivity while having quick responsiveness to refractive index difference of sample liquid, as well as a differential refracti... | 05/25/2010 |
| 7551270 | Differential refractive index detector Provided is a differential refractive index detector having a light receiving element, a zero glass, a zero glass driving unit and a storing portion, and is capable of performing purging operation thoroughly based on a unified standard. The light receiving element r... | 06/23/2009 |
| 7495754 | Differential refractometer and its adjusting method Adjustment of a differential refractometer includes the steps of (a) equally focusing a slit image on separate portions of a photodetector, (b) decreasing the quantity of light of measuring beam, (c) making parallel movement of the slit image on the photodetector by... | 02/24/2009 |
| 7283221 | Refractometer cell for both absolute and differential refractive index measurement of fluids An improved cell for a walk-off refractometer is disclosed that permits measurement of the differential refractive index, DRI, between a sample fluid and a reference fluid. In addition, the new cell design permits the measurement of the refractive index, RI, of a fl... | 10/16/2007 |
| 7280194 | Accurate determination of refractive indices of solid, fluid and liquid materials Systems and methodology for determining not only precise and repeatable results, but accurate values of the refractive index of solids, fluids and liquids. ... | 10/09/2007 |
| 7061597 | Endoscope reprocessing and sterilization system A system for reprocessing and sterilizing a previously used endoscope having at least one lumen is disclosed. The reprocessing system includes a reaction chamber into which individual chemical components of a sterilant are transferred by pneumatic force. The system ... | 06/13/2006 |
| 7027138 | Enhanced sensitivity differential refractometer incorporating a photodetector array An improved differential refractometer incorporating a photodetector array is disclosed. Using a multi-element photo array provides the basis for measurement of differential refractive index values with a heretofore unattainable combination of sensitivity of measure... | 04/11/2006 |
| 6975392 | Enhanced sensitivity differential refractometer measurement cell A sensitivity-enhanced flow cell to be used in the determination of the differential refractive index increment of a sample fluid relative to a reference fluid is disclosed. The invention permits the use of smaller sample amounts without sacrificing overall sensitiv... | 12/13/2005 |
| 6693285 | Fluorescent fluid interface position sensor A new fluid interface position sensor has been developed, which is capable of optically determining the location of an interface between an upper fluid and a lower fluid, the upper fluid having a larger refractive index than a lower fluid. The sensor func... | 02/17/2004 |
| 6346376 | Optical sensor unit and procedure for the ultrasensitive detection of chemical or biochemical analytes This document describes an optical sensor unit and a procedure for the specific detection and identification of biomolecules at high sensitivity in real fluids and tissue homogenates. High detection limits are reached by the combination of i) label-free i... | 02/12/2002 |
| 6295125 | Differential refractive index detector and liquid chromatograph equipped with the same To provide a differential refractive index detector free from fears for occurrence of personal errors in the judgement of stable condition and capable of performing highly efficient analysis operation, and a liquid chromatograph equipped with the detector... | 09/25/2001 |
| 6094262 | High temperature differential refractometry apparatus A differential refractometry apparatus that maintains optimal optical alignment of components while accurately providing differential refractometry measurements at elevated temperatures. The differential refractometry apparatus has a first thermal zone, a... | 07/25/2000 |
| 5641419 | Method and apparatus for optical temperature control The radiation generated by at least one radiation source is controlled so as to generate a constant radiation intensity, thereby to cause the object to be heated, and the radiation intensity from the object at a first wavelength is sensed until it is equa... | 06/24/1997 |
| 5483344 | Process and apparatus for performing differential refractive index measurements using interference of modulated light beams passing through reference and test samples The invention relates to the measurement of the difference between refractive indexes of two media, traversed by a light beam the beams produce an interference figure consisting of fringes having a displacement which is measured. According to the inventio... | 01/09/1996 |
| 5483334 | System for generating the same instantaneous pressure between two tanks The present invention relates to a system for generating the same instantaneous pressure between two tanks filled each with a given medium, the first tank including at least one inlet channel and at least one outlet channel for the given medium, the secon... | 01/09/1996 |
| 5422714 | Device for comparing the refractive indices of an optical immersion liquid and a reference glass A device for quickly and accurately comparing the refractive index of an optical immersion liquid with the refractive index of a reference glass that the liquid is to be used with. The device comprises a cavity to at least partially contain the immersion ... | 06/06/1995 |
| 5398110 | Differential refractometer In order to satisfy both of high-sensitivity and low-sensitivity applications with no replacement of a flow cell, a photodetector (30) is divided into four portions (44-1, 44-2, 44-3, 44-4) by a first straight line (40) which is perpendicular to a directi... | 03/14/1995 |
| 5394244 | Ambient air refracture index measuring device An improved laser refractometer (10) employing a interferometer optical component (12), an object mirror (14) and an etalon (16). The etalon (16) is moved in the path of a plurality of reference beams (22, 24) and a plurality of measurement beams (26, 28)... | 02/28/1995 |
| 5347358 | Refractometer The invention relates to a transmitted-light refractometer wherein a slit diaphragm is imaged on a diode array through a cuvette holding the sample. The cuvette itself is arranged in the telecentric beam path. The exit window of the cuvette has several re... | 09/13/1994 |
| 5157454 | Differential refractometer A differential refractometer in which: light from a light source is condensed on a lens; the light thus condensed is guided to a cell which houses a sample of which refractive index is to be measured and a reference of which refractive index is used as a ... | 10/20/1992 |
| 5004913 | Remote measurement of physical variables with fiber optic systems - methods, materials and devices Methods, materials and devices for the remote measurement of physical variables with fiber optic systems use a single excitation light source for generating through the use of at least one luminescence converter, both a signal beam and a reference beam, a... | 04/02/1991 |
| 4981338 | Optical fiber refractometer The index of refraction of a liquid is measured using an optical fiber refractometer having a light transmitting optical fiber by immersing a portion of the optical fiber in the liquid and launching light into one end of the optical fiber at a selected no... | 01/01/1991 |
| 4952055 | Differential refractometer A differential refractometer is described capable of measuring the refractive index charge, dn, of a transparent fluid corresponding to a change dc of the concentration of a solute in said fluid. The fluid is restricted to a fine capillary within a transp... | 08/28/1990 |
| 4756618 | Refractive index measurement cell A refractive index measurement cell for liquid samples and method for measuring refractive indices of liquids are described which comprise a transparent tubular member closed at one end defining a sample volume of semicylindrical shape with respect to an ... | 07/12/1988 |
| 4640615 | Liquid refractometer A liquid refractometer comprising a light source unit, a probe unit and a detection unit. The light source unit generates a beam of polarized mixed light composed of two coherent light waves that have been linearly polarized in directions at right angles ... | 02/03/1987 |
| 4286873 | Refractometer cell with integral lens A fused glass refractometer cell is disclosed in which a lens is formed by the front surface of the cell and a reflective surface is applied to the rear surface of the cell. Means are provided to limit the passage of light through the cell to the central ... | 09/01/1981 |
| 4283140 | Spatially homogenizing optical modulator Apparatus of the type including a light source directing a light beam through a measurement zone to a detector, wherein movement of the beam in a measurement direction with respect to the detector gives an indication of the measurement made in the zone, t... | 08/11/1981 |
| 4265536 | Electrical zeroing of light beam Apparatus for measuring deflection of a light beam by sensing the beam with means providing two optical measurements, and providing an electrical output dependent upon the difference between the two measurements, with the instantaneous magnitude of each m... | 05/05/1981 |
| 4229105 | Sensitive measuring cell for a differential refractometer of the interference type A highly sensitive measuring cell for a differential refractometer of the interference type for chemical analyzers comprises two channels in a measuring body, one of said channels conveying a medium whose refractive index is to be measured and the other c... | 10/21/1980 |
| 4126393 | High-sensitivity differential refractometer Disclosed herein is a high-sensitivity differential refractometer which is characterized by having a light source disposed outside a housing, a reflecting mirror attached at the end portion thereof to a reflecting mirror-supporting plate connected with th... | 11/21/1978 |
| 4073182 | Temperature compensated optical measuring instruments To reduce errors in a measuring instrument caused by temperature effects from changes in the flow rate of fluids passing through the instrument, the flow of heat is adjusted to balance the flow-rate-dependent temperature increases against the flow-rate-de... | 02/14/1978 |
| 3999856 | Diffractometric refractometer A device useful as a detector for fluid (liquid or gas) chromatograph effluent comprising a light source, a cell divided into sample and reference fluid compartments separated by an opaque diaphragm sufficiently thin to form a Fraunhofer diffraction patte... | 12/28/1976 |
