246 results about "Spectrophotometric measurement" patented technology

A method and measuring tool are presented for automatic control of photoresist-based processing of a workpiece progressing through a processing tool arrangement. Spectrophotometric measurements are applied to the workpiece prior to being processed, spectral characteristics of the workpiece are measured, thereby obtaining measured data indicative of at least one parameter of the workpiece that defines an optimal value of at least processing time parameter of the processing tool to be used in the processing of said workpiece to obtain certain process results. This data is analyzed to determine data indicative of the optimal value of said at least processing time parameter, and thereby enable calculation of a correction value to be applied to said processing time parameter prior to applying the processing tool to the workpiece.

A method and apparatus that allows accurate spectrophotometric determination of the concentrations of various hemoglobin species in whole undiluted blood. The invention employs 1) an optical apparatus designed to maximize the true optical absorbance of whole blood and to minimize the effects of light scattering on the spectrophotometric measurements of the concentrations of various constituent components, and 2) methods to correct the hemoglobin concentration measurements for light scattering and for the effects of the finite bandwidth of the substantially monochromatic light. In the optical apparatus optical parameters, such as sample thickness, detector size and shape, sample-to-detector distance, wavelengths, monochromicity, and maximum angle of light capture by detector, are selected so as to minimize the contribution of light scattering to maximize the contribution of true optical absorbance. After making measurements of a blood sample's optical density at each of the wavelengths, corrections are made for the effects of light scattering.

A proof printing system and method comprises a printer and supporting firmware for the printer, the printer comprising spectrophotometer integrated with the printer, which printer may be a commercial printer. The supporting firmware comprises color adjustment tables an/or algorithms. The system is capable of color confirmation and color calibration. The proof printing system is capable of adjusting the output signal of the spectrophotometer to compensate for conditions at the time of printing or conditions at the time of spectrophotometric measurement. The system is also capable of predicting the time it takes a color patch to reach a predetermined degree of drying that will allow reliable spectrophotometric measurements to be made. Measurement and printing conditions compensated for include at least drying of the ink, based on the determination of at least one of humidity and temperature. Measurement conditions additionally compensated for include the use of different colors of backing behind the proof and the presence or absence of an ultraviolet cutoff filter. The proof printing system can also adjust the output signal of the spectrophotometer based on a reference color standard.

The invention discloses a method for measuring the content of multiple index components in radix ophiopogonis. The method comprises the steps of performing scanning through a near infrared spectrometer, acquiring original near infrared spectroscopy data, and preprocessing the original near infrared spectroscopy data through TQAnalyst spectroscopic analysis software so as to obtain near infrared spectroscopy data for the content of the index components in the radix ophiopogonis; measuring the content of the index components in the radix ophiopogonis in a correction set through a spectrophotometric method, combining the content with feature spectroscopic information for the content measurement of the index components in the radix ophiopogonis in a correction sample set, respectively constructing correction models for the content measurement of the index components in the radix ophiopogonis by a partial least square method, substituting a checking sample set feature spectrum into the correction models to obtain an NIR (near infrared) forecast value, comparing the NIR forecast value with the content of the components in a checking sample set measured by the conventional method so as to check the correction models, and constructing a quantification model for the multiple index components in the radix ophiopogonis. The method disclosed by the invention has the advantages of short analysis time, high speed, accurate analysis result and the like, and has important significance.

A method and apparatus for monitoring water and other fluid systems is described. The fluid is continually monitored spectrophotometrically by measuring many optical parameters in an in-line, on-line system, which compensates for normal fluid changes while detecting abnormalities.

A method and apparatus for monitoring water and other fluid systems is described. The fluid is continually monitored spectrophotometrically by measuring many optical parameters in an in-line, on-line system, which compensates for normal fluid changes while detecting abnormalities.

A method for measuring at least one desired parameter of a patterned structure having a plurality of features defined by a certain process of its manufacturing. The structure represents a grid having at least one cycle formed of at least two metal-containing regions spaced by substantially transparent regions with respect to incident light defining a waveguide. An optical model is provided, which is based on at least some of the features of the structure defined by a certain process of its manufacturing, and on the relation between a range of the wavelengths of incident radiation to be used for measurements and a space size between the two metal-containing regions in the grid cycle, and a skin depth of said metal. The model is capable of determining theoretical data representative of photometric intensities of light components of different wavelengths specularly reflected from the structure and of calculating said at least one desired parameter of the structure. A measurement is area is located and spectrophotometric measurements are applied to the measurement area, by illuminating it with incident light of a preset substantially wide wavelength range. A light component substantially specularly reflected from the measurement area is detected, and measured data representative of photometric intensifies of each wavelength within the wavelength range is obtained. The measured and theoretical data are analyzed and the optical model is optimized until the ,theoretical data satisfies a predetermined condition. Upon detecting that the predetermined condition is satisfied, said at least one parameter of the structure is calculated.

A method and apparatus for non-invasively determining a blood oxygen saturation level within an organ of a subject using direct application of a near infrared spectrophotometric sensor is provided. The method includes the steps of: a) transmitting a light signal directly into the subject's organ using the sensor; b) sensing a first intensity of the light signal and a second intensity of the light signal, after the light signal travels a predetermined distance through the organ of the subject; c) determining an attenuation of the light signal along multiple different wavelengths using the sensed first intensity and sensed second intensity; d) determining a difference in attenuation of the light signal between wavelengths; and e) determining the blood oxygen saturation level within the subject's organ using the difference in attenuation between wavelengths.

A miniature flow-through cuvette for spectrophotometric measurement of a liquid sample includes a cuvette body of a transparent material including a first outer surface and an opposing second outer surface, and a flow channel disposed through the cuvette body. The flow channel includes first and second interface segments generally vertically oriented, each having an open exit; a measurement segment interconnecting the first and second interface segments; a first inclined planar inner surface disposed in a turning segment between the first interface segment and the measurement segment, facing the first outer surface; and a second inclined planar inner surface disposed in a turning segment between the second interface segment and the measurement segment, facing the second outer surface. The first and second inclined inner surfaces terminate the measurement segment at opposing ends thereof. Further provided is a spectrophotometer including the miniature flow-through cuvette.

The invention discloses a method for rapidly detecting the content of a synthetic phenol antioxidant, particularly the content of BHA (Butyl Hydroxy Anisol), TBHQ (Tert-Butyl Hydroquinone) and PG (Propyl Gallate), in edible oil and fat and oil and fat food. The method comprises the following steps of: by using an organic solvent as an extracting agent, uniformly mixing the extracting agent and a sample to be detected; carrying out oscillating extraction; taking extraction liquid; adding 3-methyl-2-benzothiazolinonehydrazone hydrochloride and ammonium ceric sulfate which are used as color development reagents into the extraction liquid; shaking the mixture well; standing; and rapidly detecting the content of the synthetic phenol antioxidant by a spectrophotometry. In the method, large-scale expensive equipment such as an HPLC (High Performance Liquid Chromatography), a GC (Gas Chromatograph) and the like are not required. An instrument required by the method is simple. The method is simple and convenient to operate, can be completed by non professional staffs, has low cost, high accuracy and reproducibility, is time-saving and labor-saving and has wide market application prospect.

According to an aspect of the present invention, a near infrared spectroscopy (NIRS) sensor assembly, system, and method for measuring a characteristic of a biological tissue is provided. The NIRS sensor assembly includes a light source, at least one light detector, and a subject contact layer. The light source is operable to emit light at one or more predetermined wavelengths. The light detector has an active area for detecting light emitted by the light source and passed through the biological tissue. The detector is operable to produce signals representative of the detected light. The subject contact layer is disposed to cover one or both of the light detector and the light source. The subject contact layer has at least one optically transmissive portion.

The invention discloses Halomonas sp. capable of degrading phenols and a high-throughput screening method and application thereof. The Halomonas sp. PH4-5 is preserved under CGMCC 10666. A bacterial liquid is cultured with a 48-pore deep-pore board, phenol concentration is measured by 96-pore microplate reader plate spectrophotometry based on 4-amino antipyrine colorimetry, moderately halophilic bacteria efficient in degrading phenols are screened from 43 environmental samples contaminated by high salinity and organics, the Halomonas sp. is separated and verified from an optimal flora E3, and a salt tolerant degrading mechanism of the Halomonas sp. is studied. Studying results show that quick screening of environmental degrading bacteria provides methodological basis and also provides technical support for the treatment of high-salinity phenolic wastewater.

The invention discloses an online digestion and luminosity detection device for water quality. The online digestion and luminosity detection device comprises a condensation and digestion integrated device, a heating system and a detection system, wherein the upper part of the condensation and digestion integrated device has an integrated design with a spiral condensation tube and a digestion cup; a three-way two-position electromagnetic valve is connected with the part below a digestion device; a luminosity detection device is vertically arranged in a black aluminum shell, and comprises a colorimetric pot, a light source, a light guide bar and a photoelectric conversion device; the colorimetric pot has an integrated sintered design, and is arranged vertically; and an overflow opening is formed in the side of the colorimetric pot. The online digestion and luminosity detection device for the water quality has a simple structure and a rational design, is low in cost and high in measurement precision, and can be applied to online water quality detectors based on a spectrophotometry.

The invention discloses a dual-emission fluorescent probe and a method for simultaneously detecting nitrite ions and Hg<2+>, which belong to the technical field of environmental detection. The fluorescent probe is a compound formed by carbon quantum dots CQDs, Tb<3+> and 3-aminophenylboronic acid in a buffer solution system with the pH value of 7.0 to 8.0. The carbon quantum dots CQDs are preparedfrom a mixed aqueous solution of nicotinic acid and barbituric acid through a hydrothermal reaction. The detection method comprises the steps of quantitatively adding a to-be-detected solution into the buffer solution system for constant volume, and then scanning an emission spectrum of a fluorescence system in a wavelength range of 320 to 650nm by taking 260 to 280nm as an excitation wavelengthof the buffer solution after constant volume; and calculating the concentrations of Hg<2+> and NO2<-> in the to-be-detected solution according to the linear relationship between the fluorescence quenching efficiency at 373 nm and 545 nm and the concentration of a to-be-detected substance. The fluorescent probe provided by the invention not only can realize trace detection of NO2<-> and Hg<2+> in awater sample, but also has better consistency and selectivity in detection results compared with a spectrophotometric method.

A system and method for spectrophotometrically measuring the total alkalinity of a liquid sample. In a particular aspect, the method involves equilibration of a CO₂ gas with a sample solution across the permeable walls of a Teflon AF 2400 liquid core waveguide. The waveguide acts as both an equilibration membrane and an optical cell in which spectrophotometric pH measurements are obtained via measurements of absorbance ratios.

The invention discloses a method for determining the ion content of cationic polyacrylamide by utilizing spectrophotometry, which is characterized in that polyvinyl alcohol lemery is prepared into a standard solution, a colloidal titration method of titrating a cationic polyacrylamide dilute solution is adopted, and visible light spectrophotometry is adopted to judge the end point of the titration. The method comprises the concrete steps: 1. preparing the standard solution; 2. preparing the cationic polyacrylamide solution and diluting; 3. regulating the pH value to 1-3 with 1 percent of hydrochloric acid, and adding 100 microlitres of 0.5 percent of toluidine blue indicator; 4. titrating with the standard solution; 5. drawing a photometric titration curve S; 6. and doing a group of blankexperiments by referencing the steps of 1-5. The invention uses the photometric titration to determine the ion content of cationic polyacrylamide and observes the color change of the solution insteadof naked eyes, thereby reducing end point judgment errors and avoiding the determining failure caused by color reversion, and therefore, the goals of increasing the end point judgment precision and the determining result accuracy are achieved.

The invention discloses melaleuca alternefolia total flavone extract and a preparation method thereof. The preparation method comprises the following steps of extracting essence oil from the melaleuca alternefolia branch and leave by water vapor, performing ethanol heating and refluxing extraction, reducing the pressure to recycle the ethanol, concentrating to remove the ethanol flavor, separating and purifying by macroporous absorption resin, and drying; measuring the content of total flavone in the melaleuca alternefolia by adopting an ultraviolet-visible spectrophotometry method. The preparation method has the advantages that the method is accurate and stable, the operation is simple, the requirement of industrial production is met, and the quality of the melaleuca alternefolia total flavone extract can be effectively controlled; the content of total flavone in the melaleuca alternefolia total flavone extract can reach more than 50 percent, the toxicity is little, and the pharmacological functions of resisting inflammation, inhibiting bacteria, alleviating pain, resisting allergy, resisting oxidizing and the like are realized; the preparation method is reasonable and stable, the production cycle is short, the preparation method is suitable for industrial production, the important meaning is realized on the deep development and utilization of melaleuca alternefolia resources, and the development prospect is good.

The invention relates to a determination method for the content of silicon in a high strength aluminum welding wire. The content of silicon in the high strength aluminum welding wire is determined by a spectrophotometric method. The determination method comprises the following steps: (1) sampling; (2) adding water and sodium hydroxide, heating until the sample is completely and clearly dissolved, and cooling; (3) acidizing; (4) heating to boil, removing nitrogen oxides, cooling, and diluting; (5) dividing the sample solution into colorimetric tubes, adding nitric acid and ammonium molybdate solution, and performing water bath; (6) cooling by running water, adding sulfuric acid-ammonium oxalate solution and ferrous ammonium sulphate solution, diluting with water to the mark, and shaking uniformly; (7) preparing a reagent blank along with the experiment; and (8) drawing a standard curve; determining an absorbance, and calculating a numerical value by the standard curve. A spectrophotometer is used for successfully determining the mass content of silicon in the high strength aluminum welding wire, a determining range of the mass content is 1.00% to 7.00%, and the accuracy is comparable to that of a gravimetric measurement method. The method saves a lot of analysis time and also increases silicon measurement method types.

The invention relates to a small-size sequential injection nitride analysis system. A first electromagnetic valve is connected with a nitride standard solution; a second electromagnetic valve is connected with a development agent and deionized water; the first electromagnetic valve and the second electromagnetic valve are both connected to a third electromagnetic valve; the third electromagnetic valve is also connected to a fourth electromagnetic valve connected with a water sample; a fifth electromagnetic valve is connected with the deionized water and a waste liquid bottle with a liquid level detection device; a fourth electromagnetic valve and a fifth electromagnetic valve are respectively connected to a six-way valve through a first peristaltic pump and a second peristaltic pump; the six-way valve is connected with waste liquid, a quantifying ring and a colorimetric match pool respectively. On the basis of theories of an improved sequential injection analysis method and a spectrophotometric method, the system has the advantages of simple structure, simplicity in operation, quantification precision, high stability, high reproducibility, high precision, low detection limit and the like; and in actual application, the system is portable and can perform full-automatic real-time on-line monitoring.

The invention discloses a testing method for lead content in a water body. The testing method includes the following steps: obtaining a water body to be tested, adjusting the pH value of the water body to be tested to 9-13; adding a masking agent and a color developing agent in the water body to be tested, mixing and standing; testing the lead content of an extract obtained through extraction and adopting a spectrophotometric method, wherein the testing wave length is 460-480 nm, the masking agent includes ethylenediamine and triammonium citrate; the color developing agent includes TPPS4 with the concentration of 0.08-0.1 g/L. The testing method is accurate and stable, and can be excellently applied in real-time on-line monitoring equipment for accurate and effective testing of the heavy metal ion lead.

Automated in-situ instrumentation has been developed for sensitive, precise and accurate measurements of a variety of analytes in natural waters. In this work we describe the use of ‘SEAS’ (Spectrophotometric Elemental Analysis System) instrumentation for measurements of solution pH. SEAS-pH incorporates a CCD-based spectrophotometer, an incandescent light source, and dual pumps for mixing natural water samples with a sulfonephthalein indicator. The SEAS-pH optical cell consists of either a liquid core waveguide (LCW, Teflon AF 2400) or custom-made PEEK tubing. Long optical pathlengths allow use of indicators at low concentrations, thereby precluding indicator-induced pH perturbations. Laboratory experiments show that pH measurements obtained using LCW and PEEK optical cells are indistinguishable from measurements obtained using conventional spectrophotometric cells and high-performance spectrophotometers. Deployments in the Equatorial Pacific and the Gulf of Mexico demonstrate that the SEAS-pH instrument is capable of obtaining vertical pH profiles with high spatial resolution. SEAS-pH deployments at a fixed river-site (Hillsborough River, Fla.) demonstrate the capability of SEAS for observations of diel pH cycles with high temporal resolution. The in-situ precision of SEAS-pH is better than 0.002 pH units, and the system's measurement frequency is approximately 0.5 Hz. This work indicates that in-situ instrumentation can be used to provide unique capabilities for observations of carbon-system transformations in the natural environment.

Provided is a measuring method for gun shooting time. On the condition of acetic acid (HAC), nitrite and sulfanilic acid (SN) have a diazo reaction and then couple with alpha-naphthylamine (NC) for coloration. Based on the light absorption characteristic of the product, spectrophotometry is adopted to measure the content of nitrite in shooting residue. The residue in a gun barrel obtained at different time after shooting is extracted for analysis, a relation curve of the content of nitrite and shooting time is obtained, and thus gun shooting time is determined. The measuring method for gun shooting time is capable of providing an effective method for detection of gun shooting time, causes no damage to a gun on the premise of guaranteeing extraction effect, has the advantages of being accurate, fast, high in sensitivity, good in stability, reliable in results and the like, and meets the requirements for detection and scientific research of gun shooting time.