31 results about "Refractometry" patented technology

Disclosed are a method of detecting a leak of fluoroolefin compositions and sensors used therefor. In particular, the method is particularly useful for detecting a leak of a fluoroolefin refrigerant composition from a cooling system of an automotive vehicle. Such fluoroolefin refrigerant compositions have double bond structures which make them particularly well suited with sensing technologies, including: infrared sensors, UV sensors, NIR sensors, ion mobility or plasma chromatographs, gas chromatography, refractometry, mass spectroscopy, high temperature thick film sensors, thin film field effect sensors, pellistor sensors, Taguchi sensors and quartz microbalance sensors.

Disclosed are a method of determining the components of a fluoroolefin composition, a method of recharging a fluid system in which the composition is used, and sensors used therefor. In particular, the composition may be a fluoroolefin refrigerant composition used within a vapor compression system, where the refrigerant composition is useful in cooling systems as replacements for existing refrigerants with higher global warming potential. Such fluoroolefin refrigerant compositions have double bond structures which make them particularly well suited with sensing technologies, including: infrared sensors, UV / vis sensors, NIR sensors, ion mobility or plasma chromatographs, gas chromatography, refractometry, mass spectroscopy, high temperature thick film sensors, thin film field effect sensors, pellistor sensors, Taguchi sensors and quartz microbalance sensors.

The invention relates to refractometry and attenuated reflectance spectrometry in a wellbore environment. Specifically, it pertains to a robust apparatus and method for measuring refractive index of fluids along a continuum (rather than in steps), and for measuring attenuated reflectance spectra, and for interpreting the measurements made with this apparatus to determine a variety of formation fluid parameters. The present invention provides a method and apparatus to distinguish between gas and liquid based on the much lower index of refraction of gas. It can also be used to monitor fluid sample clean up over time. The refractive index of a wellbore fluid is determined from the fraction, R, of light reflected off the interface between a transparent window that has a known refractive index and this fluid. Preferably, the refractive index is measured at some wavelength of light for which the fluid is not highly attenuating but is optimally attenuating. The adjacent transmission spectrometer can be used to correct the refractive index measurement for attenuation at those wavelengths, which it monitors. Also, this reflection-based refractometer design can be used as an attenuated reflectance spectrometer at highly attenuating wavelengths.

Spatially localized dispersion measurement and glucose measurement by means of optical short-coherence interference refractometry. This application is directed to methods and arrangements for the measurement of the dispersion and of the glucose content in transparent and partially transparent tissues and body fluids. Methods of short-coherence interferometry and spectral interferometry are modified for the measurement of tissue thickness and for the measurement of local dispersion. In the technique based on short-coherence interferometry, partial interferograms from the short-coherence interferogram G(τ) are used for the dispersion measurement. In the technique based on spectral interferometry, partial areas from the ω-spectrum of the spectral interferogram are used for the dispersion measurement. FIG. 6 shows an arrangement based on spectral interferometry. A temporally short-coherence light source illuminates the modified Michelson interferometer. The beam splitter splits the illuminating beam into a measurement beam and a reference beam. The light waves and reflected from the interferometer impinges on the spectrometer at the interferometer output. The registered spectral interferogram i(ω) forms the basis for the calculation of the dispersion of different orders. The viewing direction of the eye of the subject is fixated by means of a target beam.

This invention relates to one low transparent reflection measurement device and method, wherein, the device comprises shell expansive lens, convex lens and column lens co-axis optical system, capillary on the focus plane and its back semi-transparent screen and computer with software program connected to CCD cameral and wire. This invention is characterized by the following: it comprises at least three-dimensional adjust rack loaded with micro lens and micro hole and grating; the front focus point of micro lens is overlapped with micro hole and the micro hole is overlapped with back focus and the capillary tube is on adjust rack.

A method and device for determining refractive index of an object compared to a refractive index of a surrounding medium. The object is exposed to a laser object beam and the scattered light interferes with a laser reference beam to obtain a hologram. The hologram is analyzed for phase information, and based thereon, it is determined if the refractive index of the object is higher or lower than the refractive index of the surrounding medium.

An in-line holographic microscope is used for measurements of micrometer-scale particles and associated suspending fluid medium containing the particles. The system yields heterodyne scattering patterns that may be interpreted with Lorenz-Mie theory to obtain precise time-resolved information on the refractive index of the suspending medium for determining chemical composition, concentrations and makeup thereof. This approach can perform spatially resolved refractometry with measurements on calibrated refractive index standards and monitor chemical concentration in a microfluidic channel. Using commercially available colloidal spheres as probe particles and a standard video camera for detection yields volumetric refractive index measurements with a resolution of 2×10−3 RIU for each probe particle in each holographic snapshot.

A light beam reshaper by refraction aiming at two-dimension laminated light source is characterized in that the light beam reshaper comprises a first parallel flat mirror pile which is stacked by a plurality of flat mirrors and a second parallel flat mirror pile which is also stacked by a plurality of flat mirrors; wherein, the first parallel flat mirror pile and the second parallel flat mirror pile are arranged in sequence along the transmission direction of light beam. The light beam reshaper by refraction aiming at two-dimension laminated light source of the invention has the advantage that after the outgoing two-dimension light beam matrix getting through the reshaper, the shining dead zone is eliminated and becomes even-distributed beam with better focusing performance.

The invention relates to a method for measuring the refractive index of biological tissues by utilization of the frequency-domain optical coherent tomography technology. The method is as follows: measurement is performed by utilization of the frequency-domain OCT system; interference spectrum measurement is performed for two times before and after a biological tissue sample is placed and the position of a reference mirror of a sample arm before the sample is placed and the positions of the front surface and the rear surface of the sample after the sample is placed are acquired, and then the refractive index of the sample is calculated. The sample arm of the frequency-domain OCT system is provided with a sample arm flat mirror, and the sample is attached to the flat mirror when placed. Because the frequency-domain OCT technology does not require a reference arm to perform axial scanning, the speed for measuring the refractive index under frequency-domain OCT is quicker than the measuring speed under time-domain OCT, thereby the method greatly shortens the exposure time of the sample in air, reduces the refractive index variation caused by moisture loss of the biological tissues and improves the measurement accuracy.

The invention relates to a method for improving the sensitivity of a surface plasmon resonance sensor based on a spectral response curve. The method comprises the steps that the first spectral response curve monotonically decreasing within a selected wavelength range is obtained; the incident angle of the SPR sensor is adjusted, so that within a preset refractometry range, the resonant wavelength of the SPR is within the wavelength range of the spectral response curve and is better at the end of the long wave; the position of the resonant wavelength of the SPR is judged directly through original spectral data of a system, and adopted as output data of the sensor, and therefore the sensitivity of the spectral type SPR sensor is improved.

Described are apparatus and methods allowing measurement of adsorption and desorption of analytes with membranes or resins directly using increased lateral mass transport. Such increased lateral mass transport may be accomplished through the incorporation of a porous media, such as a fibrous bed or a concentrated bed of spheres, into said flow cell. Further described is a method of determining if a flow cell would benefit from increased lateral mass transport comprising comparing the rate of surface reaction to the mass transfer coefficient for a given analyte. The detection method for the measurement of adsorption and desorption of analytes may be based on the evanescent wave phenomenon at total internal reflection, such as surface plasmon resonance (SPR), critical angle refractometry, total internal reflection fluorescence (TIRF), total internal reflection phosphorescence, total internal reflection light scattering, optical waveguide fluorescence, evanescent wave. ellipsometry, nuclear magnetic resonance (NMR) spectroscopy, quartz crystal microbalance / dissipation, calorimetry, ellipsometry, and voltammetry.

A subjective eye refractometer includes an imaging lens and a target, the front surface of the cornea of a testee is located at a focal point of the imaging lens, the target and an eye of the testee are respectively located on two sides of the imaging lens along an optical axis of the imaging lens, and the target can move forward and backward along the optical axis by means of setting, and the subjective eye refractometer is marked with a value D1 for identifying a spherical refractive-power along a movement path of the target, a movement position x is obtained by subtracting a focal distance f0 from an object distance of the target, when the testee sees the target clearly, the spherical refractive-power of glasses to be worn on the eyes is the corresponding spherical refractive-power D1 at the movement position x of the target. The invention further discloses a subjective refractometry method.

The invention relates to an emulsion concentration on-line detection method based on density variation, which comprises the following steps: 1)determining a standard curve; 2)detecting the density of an emulsion to be measured; 3)detecting the temperature of the emulsion to be measured; 4)resolving the concentration of the emulsion, and compensating temperature; and 5) performing data communication and publishing the measure result. The emulsion concentration on-line detection method has the advantages that the measure precision is high, the measure repeatability is good, and influence due to temperature is little, by employing a flow measure method that an emulsion is flowed through a sensor, the problem that large deviation of the result due to lens pollution by a refractometry method is not existed, and the long-term stability of the on-line detection method is better.

The invention relates to the technical field of fruit vinegar, and particularly relates to fruit vinegar and a preparation method thereof. The fruit vinegar is prepared by adopting various fruits, such as papaya, jujubes, lemons, mangos, pomegranates and green cucumbers, so that the fruit vinegar is rich in nutrients; moreover, the taste of the fruit vinegar is improved, and the prepared fruit vinegar is bright red, strong in fruit fragrance, moderate in acidity and rich in nutrients and has the functions of invigorating the stomach and promoting digestion; and the physical-chemical indexes and microorganism indexes of the obtained fruit vinegar are better than those of GB2719-2003, specifically, the content of soluble solids detected by adopting refractometry at 20 DEG C is more than 4 percent, the content of total acids is more than 0.4 g / 100mL on the basis of acetic acid, the content of free amino acid is more than 286 mg / 100mL, and the content of nonvolatile acid is more than 0.68g / 100mL on the basis of lactic acid.

The invention relates to the field of resin preparation, in particular to a preparation method of urushiol boron resin. The preparation method includes: extracting urushiol, to be more specific, adding equal-mass xylene into raw lacquer, stirring at normal temperature, standing for layering, performing vacuum filtration on the upper-layer brown solution to obtain a urushiol xylene solution, measuring the solid content of the urushiol xylene solution, and using refractometry to measure the mass fraction of urushiol for standby; preparing urushiol formaldehyde polymer, to be more specific, adding formaldehyde, the urushiol xylene solution and ammonia water into a 1000mL three-opening flask, slowing heating to about 90 DEG C, performing heat-preservation reaction for 80 minutes, heating untilreflux occurs, using an oil-water separator to perform oil-water separation, stopping the reaction after all water is removed, and cooling to room temperature for standby. The preparation method is simple in process, simple to operate and capable of increasing product quality and comprehensive performance.

An optical system and method for quantifying total protein in whole blood or other multi-phase liquids and colloidal suspensions uses refractometry without preliminary steps such as cell separation orcentrifugation. A refractometer is integrated with a flow cell to enable the refractive index of a flowing sample to be measured based on a substantially cell free boundary layer of the sample that is present under certain flow conditions. Dimensions of the flow cell are selected to produce a cell-free layer in a flow of whole blood in which the cell free layer is thick enough to reduce scattering of light from the refractometer light source. A numerical method is used to compensate for scattering artifacts. The numerical compensation method is based on the slope and width of a peak in the derivative curve of an angular spectrum image of the flowing sample produced by refractometry.

The invention relates to the field of liquid density measurement, in particular to a liquid density monitoring device realized by a single refraction method, which comprises a right-angle prism, an LED lamp arranged at the top end of the right-angle prism and providing an incident light source for the right-angle prism, and a CCD (Charge Coupled Device) photosensitive element arranged parallel to the inclined plane of the right-angle prism, light emitted by the LED lamp irradiates into the right-angle prism from the right-angle side of the right-angle prism in the vertical direction, then is refracted to an inclined plane from the right-angle bottom side of the right-angle prism in the horizontal direction and then irradiates onto the CCD photosensitive element, the CCD photosensitive element converts an optical signal into an electric signal and transmits the electric signal to the single chip microcomputer, and the liquid density can be calculated through a built-in formula of the single chip microcomputer. And the device is not influenced by vertical and horizontal shaking and strong acidity of the ship body.

Systems and methods for performing refractometry include a primary waveguide, that has an injection end optically coupled to a laser and an output end optically coupled to a detector. A secondary waveguide has an interior, closed-loop optical path exhibiting total internal reflection, and an exterior surface having bound thereto a plurality of instances of a first binding entity type for an analyte. A portion of the exterior surface of the secondary waveguide is adjacent to the exterior surface of the primary waveguide, and a solution comprising a carrier fluid and an amplification complex includes a secondary particle bound to a second binding entity type for the analyte. The second binding entity type selected to bind to the analyte. The secondary particle is selected to have an index of refraction different from both the carrier fluid and the analyte.

The invention provides an ophthalmologic apparatus and a control method thereof. In the ophthalmologic apparatus capable of performing refractive power measurement and OCT measurement, the time required for measurement and the like can be shortened. The ophthalmologic apparatus includes a refractometry optical system, an OCT optical system, a fixation projection system, and a controller. The refractometry optical system is configured to project light onto a subject's eye and to detect returning light from the subject's eye. The OCT optical system is configured to split light from an OCT lightsource into measurement light and reference light, to project the measurement light onto the subject's eye, and to detect interference light between returning light of the measurement light from the subject's eye and the reference light. The fixation projection system is configured to simultaneously project a first fixation target and a second fixation target onto the subject's eye, a visual angleof the second fixation target being narrower than a visual angle of the first fixation target. The controller is configured to control the refractometry optical system and the OCT optical system to simultaneously perform a refractometry and an OCT measurement.

In a method for operating an inkjet printing machine, a condition of an ink is determined. A sedimentation and / or agglomeration of a pigmented ink (21, 24) is determined by refractometry, i.e. the value of the refractive index of the ink is measured (4, 12) with a refractometer (31, 32) and compared (5, 13) with a stored value (6, 14) with computer assistance.

The invention relates to the technical field of glue quality analysis, in particular to a glue quality monitoring method based on turbidity analysis. The method comprises the following steps of firstly, preparing and diluting a glue or a glue intermediate product into a glue solution, representing the concentration of the glue solution by using the refractive index (brix degree) of the glue solution, and determining the concentration of the glue solution by adopting a refraction method; diluting the glue solution to a specific concentration according to the concentration measured by a refraction method; determining the turbidity of the to-be-detected glue solution with the specific concentration by using a turbidity meter; and judging the glue quality in the production process according to the refractive index and the turbidity value. The testing principle is reasonable, the concentration of the glue solution is measured by the refraction method, and the linear relation is good through verification of a gravimetric method; according to the optical characteristics of the impurities, the turbidity of the glue solution with specific concentration is used for representing the water-insoluble impurities in the glue solution, so that the actual condition of the water-insoluble impurities can be better represented; the operation is simple, the analysis efficiency is high, and the refraction method for determining the concentration of the glue solution has the characteristics of rapidness, simplicity and convenience.