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39 results about "Coulometry" patented technology
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Coulometry determines the amount of matter transformed during an electrolysis reaction by measuring the amount of electricity (in coulombs) consumed or produced. Coulometry is a group of techniques in analytical chemistry. It is named after Charles-Augustin de Coulomb.
Condensate glucose analyzer
InactiveUS20080045825A1Early diagnosisEarly detectionRespiratory organ evaluationSensorsEnvironmental healthGlucose polymers
The present invention provides systems and methods for analyzing glucose present in exhaled breath condensate (EBC). In certain embodiments of the invention, electrochemical- or coulometric-based sensing technologies are used to analyze EBC for the presence and / or concentration of glucose.
Owner:UNIV OF FLORIDA RES FOUNDATION INC
Small volume in vitro analyte sensor
InactiveUS20050164322A1Lower the volumeAccurate and efficient measurementBioreactor/fermenter combinationsBiological substance pretreatmentsElectron transferPolymer
A sensor designed to determine the amount and concentration of analyte in a sample having a volume of less than about 1 μL. The sensor has a working electrode coated with a non-leachable redox mediator. The redox mediator acts as an electron transfer agent between the analyte and the electrode. In addition, a second electron transfer agent, such as an enzyme, can be added to facilitate the electrooxidation or electroreduction of the analyte. The redox mediator is typically a redox compound bound to a polymer. The preferred redox mediators are air-oxidizable. The amount of analyte can be determined by coulometry. One particular coulometric technique includes the measurement of the current between the working electrode and a counter or reference electrode at two or more times. The charge passed by this current to or from the analyte is correlated with the amount of analyte in the sample. Other electrochemical detection methods, such as amperometric, voltammetric, and potentiometric techniques, can also be used. The invention can be used to determine the concentration of a biomolecule, such as glucose or lactate, in a biological fluid, such as blood or serum. An enzyme capable of catalyzing the electrooxidation or electroreduction of the biomolecule is provided as a second electron transfer agent.
Owner:ABBOTT DIABETES CARE INC
Analyte sensor with insertion monitor, and methods
InactiveUS20060191787A1Efficient methodImmobilised enzymesBioreactor/fermenter combinationsAnalyteD-Glucose
A sensor, and methods of making, for determining the concentration of an analyte, such as glucose or lactate, in a biological fluid such as blood or serum, using techniques such as coulometry, amperometry, and potentiometry. The sensor includes a working electrode and a counter electrode, and can include an insertion monitoring trace to determine correct positioning of the sensor in a connector.
Owner:ABBOTT DIABETES CARE INC
Small volume in vitro analyte sensor
InactiveUS20060169599A1Lower the volumePrecise processImmobilised enzymesBioreactor/fermenter combinationsElectrolysisElectron transfer
A sensor utilizing a non-leachable or diffusible redox mediator is described. The sensor includes a sample chamber to hold a sample in electrolytic contact with a working electrode, and in at least some instances, the sensor also contains a non-leachable or a diffusible second electron transfer agent. The sensor and / or the methods used produce a sensor signal in response to the analyte that can be distinguished from a background signal caused by the mediator. The invention can be used to determine the concentration of a biomolecule, such as glucose or lactate, in a biological fluid, such as blood or serum, using techniques such as coulometry, amperometry, and potentiometry. An enzyme capable of catalyzing the electrooxidation or electroreduction of the biomolecule is typically provided as a second electron transfer agent.
Owner:ABBOTT DIABETES CARE INC
Small volume in vitro analyte sensor
InactiveUS20050278945A1Lower the volumeAccurate and efficient measurementImmobilised enzymesBioreactor/fermenter combinationsElectrolysisElectron transfer
A sensor utilizing a non-leachable or diffusible redox mediator is described. The sensor includes a sample chamber to hold a sample in electrolytic contact with a working electrode, and in at least some instances, the sensor also contains a non-leachable or a diffusible second electron transfer agent. The sensor and / or the methods used produce a sensor signal in response to the analyte that can be distinguished from a background signal caused by the mediator. The invention can be used to determine the concentration of a biomolecule, such as glucose or lactate, in a biological fluid, such as blood or serum, using techniques such as coulometry, amperometry, and potentiometry. An enzyme capable of catalyzing the electrooxidation or electroreduction of the biomolecule is typically provided as a second electron transfer agent.
Owner:ABBOTT DIABETES CARE INC
Small Volume in Vitro Analyte Sensor and Methods
InactiveUS20020157948A2Efficient methodImmobilised enzymesBioreactor/fermenter combinationsElectric chargeEnvironmental geology
<heading lvl="0">Abstract of Disclosure< / heading> A small volume sensor, and methods of making, for determining the concentration of an analyte, such as glucose or lactate, in a biological fluid, such as blood or serum, using techniques such as coulometry, amperometry, and potentiometry. The sensor includes a working electrode and a counter electrode, and can include an insertion monitoring trace to determine correct positioning of the sensor in a connector. In one embodiment, the sensor determines the concentration of the analyte by discharging an amount of charge into the sample, determining the time needed to discharge the charge, and determining the current used to electrolyze a portion of the analyte using the amount of charge and the amount of time.
Owner:ABBOTT DIABETES CARE INC
Microcoulomb analysis method for chlorinity high-temperature burning of organic phosphate fire-resistant oil and device thereof
ActiveCN101571507ASimple and efficient operationFast analysisSpecial data processing applicationsMaterial electrochemical variablesPower analysisNitrogen gas
The invention belongs to a microcoulomb analysis method for the chlorinity high-temperature burning of organic phosphate fire-resistant oil and a device thereof, belonging to the field of power analysis chemistry and solving the defects of complicated operation steps, long time consumption, unobvious titration end point, poor accuracy and repetitiveness and high cost existing in the prior art. The device comprises a high-temperature furnace and a burning tube inserted in the high-temperature furnace; the burning tube is provided with an oxygen interface, a nitrogen interface and a sample inlet and comprises a gasifying section and a burning section, one end of the burning tube is connected with a sample inlet device, and the other end is connected with an electrolytic bath. The device adopts heating, gasifying and electrolytic analysis methods to obtain the chlorinity of a sample. The invention has simple and convenient operation and rapid analysis speed and adopts a microcoulomb method to analyze titration and judge the end point so as to be more accurate than the prior oxygen bomb method by visual inspection and manual measurement, have good test repetitiveness, avoid using toxic chemical reagents and improve the safety.
Owner:ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY
Pressure difference final motion liquid column balance type coulometry BOD measuring device
ActiveCN104880504AEasy to operateHigh degree of automationMaterial electrochemical variablesSolubilityWater baths
The invention relates to a pressure difference final motion liquid column balance type coulometry BOD measuring device. The device comprises a constant-temperature control unit and a plurality of coulometry BOD measuring units arranged in the constant-temperature control unit. The constant-temperature control unit comprises a constant-temperature water bath, a temperature probe arranged in the constant-temperature water bath, a relay, a data collecting controller and a cold and hot water device, and the relay, the data collecting device and the cold and hot water device are electrically connected with the temperature probe in sequence. The cold and hot water device is communicated with the constant-temperature water bath through a pipeline. The coulometry BOD measuring units are all arranged in the constant-temperature water bath and connected with the data collecting controller through a circuit. Compared with the prior art, the device is simple and compact in overall structure, easy to operate, stable in performance and easy to dismount, wash and replace, computer full-course automatic monitoring, tracking and recording of related test parameters can be achieved, and the device can be used for biodegradation tests of various organic matter such as volatility organic matter, photolysis organic matter and slightly solubility organic matter.
Owner:SHANGHAI RES INST OF CHEM IND +1
Preparation method of water content standard material
InactiveCN102252885AGood uniformity between bottlesStable moisture contentPreparing sample for investigationBottleVolumetric flask
The invention relates to a preparation method of a water content standard material. The method comprises the steps of: weighing the mass of a dried glass volumetric flask, adding propylene carbonate, 1-butanol and xylene in proportion, and weighing the mass of the mixed solution; measuring water in the mixed solution, and calculating the mass of water needing to be added according to a preparation target value; adding deionized water into the volumetric flask and mixing the solution well; shifting part of the mixed solution into an ampoule bottle, adjusting the humidity of a constant temperature and humidity chamber, monitoring water content variations over time under different humidity conditions; recording the humidity within the constant temperature and humidity chamber when the solution water content varies minimally; under a humidity condition with stable solution water content, charging ampoule bottles with the mixed solution separately, and sealing the ampoule bottles; taking the mean of the results measured by Coulometry and volumetric methods as the water content of a standard material; and evaluating the water uncertainty. The water content standard material prepared by the method of the invention is beneficial for improving the accuracy of a Karl Fischer water titrator measuring result.
Owner:NAT INST OF METROLOGY CHINA
Current sensor
ActiveUS20150077091A1Reduce energy wasteReduce energy consumptionBase element modificationsElectrical testingShunt DeviceInstrumentation amplifier
Owner:SENSATA TECHNOLOGIES INC
Method and system for estimating state of charge of a lithium electrochemical cell having a lithium phosphate type positive electrode
ActiveUS9316693B2Accurately determinedPrevent over-chargingBatteries circuit arrangementsCell electrodesPhosphoric acidCurrent sensor
Owner:SAFT GRP SA
Method for determining total concentration of organic gas in environmental gas by photocatalytic fuel cell (PFC) photoelectrocatalysis method
ActiveCN102305816ANo secondary pollutionShort measurement timeMaterial electrochemical variablesDesorptionWorkstation
The invention discloses a method for determining the total concentration of organic gas in environmental gas by a photocatalytic fuel cell (PFC) photoelectrocatalysis method. The PFC photoelectrocatalysis method particularly comprises a PFC saturation photocurrent method and a PFC coulometry. The method for determining the total concentration of the organic gas in the environmental gas comprises the following steps of: manufacturing a PFC three-in-one electrode; assembling a PFC determining device; and recording the saturation photocurrent or electric quantity of organic gas of a light anode chamber, and calculating the total concentration of the organic gas in the environmental gas according to the corresponding formula. The total content of the organic gas in the environmental gas is determined by using a PFC device, electric signals of PFC photoelectrocatalysis on oxidizing reaction of the organic gas are recorded by using an electrochemical workstation, and the total content of the organic gas in the gas is calculated according to the theories of the saturation photocurrent method and the coulometry. The technology solves the problems of complex conventional processes of acquisition, desorption, pre-treatment and the like, and a sample can be directly used for determination without pretreatment; and the method is short in determination time, and quick and convenient and avoids secondary pollution and is suitable for environment monitoring and laboratory analysis.
Owner:GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
Device and method for determination of trace moisture content of sulfur hexafluoride gas
InactiveCN106066352ASimple structureLow costMaterial electrochemical variablesElectrolysisSulfur hexafluoride
The invention discloses a device and a method for the determination of trace moisture content of sulfur hexafluoride gas. The method comprises the following steps: A, inhaling a certain amount of sulfur hexafluoride gas at a constant speed; B, electrolyzing the inhaled sulfur hexafluoride gas in a coulombmeter electrolytic tank; C, collecting relevant data, and determining the moisture content in the sulfur hexafluoride gas according to the Karl-Fischer coulometry method. The method is easy for measurement, consumes less time and has accurate results; and the device has simple structure and low cost, and is applicable to popularization and use.
Owner:STATE GRID SICHUAN ELECTRIC POWER CORP ELECTRIC POWER RES INST +2
Body fat scale control human body microscale metal element method and system
PendingCN109008978AImprove health statusEasy to controlDiagnostic recording/measuringSensorsApplication areasComputer science
The invention relates to the body fat scale health application field, and discloses a body fat scale control human body microscale metal element method and system; the method comprises the following steps: S10, using an electrode to obtain user internal corresponding microscale metal element contents by using a controlled potential coulometry; S20, providing diet suggestions for users according tothe microscale metal element contents. The method can calculate the human body microscale metal element contents, can provide proper diet suggestions for the user from the origin according to the user self body status, thus effectively improving the targeting purpose of using the body fat scale to make health management, and enhancing the diet suggestion timeliness and validity.
Owner:杭州吉吉知识产权运营有限公司
Crude oil and tar water content measuring device by Karl Fischer coulometry method
InactiveCN105223256AAvoid the disadvantages of failureIncrease profitMaterial electrochemical variablesElectrolysisNitrogen gas
The invention relates to a crude oil and tar water content measuring device by a Karl Fischer coulometry method, and relates to an electronic chemical analysis instrument. The crude oil and tar water content measuring device consists of a nitrogen gas storage tank, a step motor, a needle valve, a mass flow meter, an electromagnetic valve, a metal bath gasification unit, a Karl coulometry method electrolytic tank and a control unit, wherein a valve rod of the needle value is in transmission connection with a power output shaft of the step motor; the nitrogen gas storage tank, the needle valve, the mass flow meter, the electromagnetic valve, the metal bath gasification unit and the Karl coulometry method electrolytic tank are sequentially connected through pipelines; the control unit is connected with the step motor, the mass flow meter, the electromagnetic valve, the metal bath gasification unit and the Karl coulometry method electrolytic tank through circuits. According to a method adopted by the device, samples are not directly injected into the electrolytic tank; the metal bath gasification unit is adopted for heating the samples; high-purity nitrogen gas is used for blowing moisture in the samples into the electrolytic tank; the defect of reagent failure due to oil film coating formed by impurities in crude oil or tar on electrolytic electrodes and measuring electrodes can be avoided; the reagent utilization rate is improved.
Owner:大庆市日上仪器制造有限公司
Detection method of chlorine content in 2-ethylanthraquinone
InactiveCN108982750AImprove weighing accuracyDetection speedChemical analysis using titrationWorkstationData stability
The invention discloses a detection method of the chlorine content in 2-ethylanthraquinone. The detection method comprises the following steps of 1) preparing an organic chlorine standard solution; 2)preparing a sample, and weighing about 4 micrograms of sample in a sample weighing cup with an analysis scale; 3) putting the sample on a micro-coulometry sulfur-chlorine determinator for detection,wherein integration resistance of a data workstation of the micro-coulometry sulfur-chlorine determinator is equal to 1 K, and the amplification factor is equal to 2000; 4) calculating an average conversion rate; and 5) sending the sample into the micro-coulometry titrator for determination by using a solid sample feeding boat. In the detection method, as the feeding quantity required for detection is small and is less than 4 micrograms, the detection cost can be reduced, and the detection speed is increased. The practical application discovers that the detection method is short in detection time, good in data stability and simpler in operation compared with the prior art and can lower the labor intensity of detecting personnel.
Owner:HUZHOU JICHANG CHEM
Electrochemical measurement-based method and device for measuring thickness of copper wire plating
The invention relates to the field of cylinder plating thickness measurement, particularly to an electrochemical measurement-based method and device for measuring thickness of a copper wire plating. The electrochemical measurement-based method includes that a rubber ring reacting cup is replaced by a plastic reacting cup, a titanium wire is adopted as a cathode of a reacting electrode wire, a copper wire to be tested is adopted as an anode, and an instrument, originally for measuring sheet plating thickness with the coulometry, is adopted to measure the copper wire; an electric stirring pen is added to replace manual swinging, and measuring consistence is improved; different reacting lengths of the copper wires with different diameters are calculated according to the requirement for a plane reacting area of the measuring instrument, and producing a length fixing die and a length positioning rubber die according to the length required for reaction, in this way, reacting length measurement is accurate, and operational efficiency and precision is improved; after improvement, efficiency is increased by 4 times, and the precision and consistence of the test is increased by 10% from 30%.
Owner:江苏皋鑫电子有限公司
Detection method of organic chlorine content in crude oil containing free water
ActiveCN107796861BIncrease credibilityEasy to useDewatering/demulsification with electric/magnetic meansMaterial electrochemical variablesDistillationOil water
Owner:CHINA PETROLEUM & CHEM CORP +1
Method for enhancing stability of early warning against water environment toxicity
PendingCN113702474AReduce the impactPromote recoveryMaterial electrochemical variablesSodium acetateMicroorganism
The invention relates to a method for enhancing the stability of early warning against water environment toxicity, and belongs to the technical field of water body biotoxicity early warning. According to the method, a differential coulometric method is adopted, and the principle of the differential coulometric method is as follows: adding sodium acetate with the concentration of more than or equal to 384.6 mg / L into a water sample to be detected, enabling the utilization rate of microbial enzyme on an anode to be saturated, collecting coulometric quantity after the sodium acetate is added for 2-5 hours as an analytic signal, and calculating the inhibition ratio (IR) of the coulometric quantity to perform early warning of toxicity.
Owner:CHONGQING INST OF GREEN & INTELLIGENT TECH CHINESE ACADEMY OF SCI
Gas drying device for micro-coulometry total-chlorine analyzer
InactiveCN103604669AFully dryEasy outflowPreparing sample for investigationMaterial electrochemical variablesPetrochemicalChloride
The invention discloses a gas drying device for a micro-coulometry total-chlorine analyzer. The gas drying device comprises a concentrated sulfuric acid drying cylinder and a magnesium perchlorate drying tube which are serially connected, wherein the concentrated sulfuric acid drying cylinder comprises a cylinder body, a gas inlet pipe and a gas outlet; concentrated sulfuric acid is contained in the cylinder body; the magnesium perchlorate drying tube comprises a tube body, an ingress pipe, an eduction pipe and a tube plug, magnesium perchlorate is contained in the tube body, the lower part of the cylinder body is cylindrical, and the upper part of the cylinder body is spherical. The gas drying device is mainly used for micro-coulometry measurement of total chloride content in petrochemical products, and is capable of effectively removing water in a sample gas by drying the sample gas for two times; the detection sensitivity, accuracy and repeatability of the total chlorine measurement are remarkably improved, and the effective detection of a low-chlorine sample can be realized.
Owner:江苏东华分析仪器有限公司
Method of detecting content of organic chlorine in crude oil containing free water
ActiveCN107796861AWill not affect the determinationEfficient removalDewatering/demulsification with electric/magnetic meansMaterial electrochemical variablesRefluxHigh density
The invention discloses a method of detecting the content of organic chlorine in crude oil containing free water. The detection method comprises the following steps: primarily separating oil and water, measuring the viscosity at a temperature of 60 DEG C; when the viscosity is less than 300 mPa.s, carrying out dehydration in an enclosed space at a temperature of 60 DEG C, measuring the organic chlorine content of crude oil by a micro-coulometry method; when the viscosity is greater than 300 mPa.s, adding No.120 solvent oil into crude oil, removing water by a distillation and reflux mode; reading the volume of separated water; adding distilled No.120 solvent oil into crude oil again, putting crude oil in a distillation instrument, measuring the organic chlorine content of the crude oil by amicro-coulometry method; recording related data, and substituting the data into a formula to carry out calculation. Crude oil containing free water is divided into low density and low viscosity crudeoil and high density and high viscosity crude oil based on the viscosity and density; different dehydration and measuring modes are adopted to solve the difficulty in measuring the content of organicchlorine in crude oil containing free water; when the standard content of organic chlorine is more than 3 [mu]g / g, the detection credibility is high, and the relative error is within 10%.
Owner:CHINA PETROLEUM & CHEM CORP +1
Preparation method of water content standard material
InactiveCN102252885BGood uniformity between bottlesStable moisture contentPreparing sample for investigationXylyleneBottle
The invention relates to a preparation method of a water content standard material. The method comprises the steps of: weighing the mass of a dried glass volumetric flask, adding propylene carbonate, 1-butanol and xylene in proportion, and weighing the mass of the mixed solution; measuring water in the mixed solution, and calculating the mass of water needing to be added according to a preparation target value; adding deionized water into the volumetric flask and mixing the solution well; shifting part of the mixed solution into an ampoule bottle, adjusting the humidity of a constant temperature and humidity chamber, monitoring water content variations over time under different humidity conditions; recording the humidity within the constant temperature and humidity chamber when the solution water content varies minimally; under a humidity condition with stable solution water content, charging ampoule bottles with the mixed solution separately, and sealing the ampoule bottles; taking the mean of the results measured by Coulometry and volumetric methods as the water content of a standard material; and evaluating the water uncertainty. The water content standard material prepared by the method of the invention is beneficial for improving the accuracy of a Karl Fischer water titrator measuring result.
Owner:NAT INST OF METROLOGY CHINA
Method for constructing electrochemical nucleic acid sensor recognition element through insertion method
PendingCN113125539AMaintain hybrid activityIncrease hybridization rateMaterial analysis by electric/magnetic meansHybridization reactionBiology
The invention belongs to the technical field of biosensor construction and particularly discloses a method for constructing an electrochemical nucleic acid sensor recognition element through an insertion method. The insertion method specifically comprises the following steps of inserting a sulfhydrylated capture probe into a diluent sulfydryl layer to construct an electrochemical nucleic acid sensor recognition element. Compared with an existing backfilling method, the electrochemical nucleic acid sensor recognition element prepared by adopting the insertion method can improve uniformity of the recognition element and maintain hybridization activity of the probe so that the electrochemical nucleic acid sensor recognition element has better analysis performance; meanwhile, thermodynamic and kinetic parameters of a hybridization reaction process between the capture probe and target nucleic acid in a solution are analyzed in combination with a timing coulometry, and the insertion method disclosed by the invention is more beneficial to understanding a mechanism of an interface hybridization reaction on a molecular level.
Owner:CHONGQING MEDICAL UNIVERSITY
Isolated low-noise micro-current amplifier
InactiveCN103376287AImprove analysis accuracyNo loss of sensitivityMaterial electrochemical variablesLow noiseElectronic switch
The invention discloses an isolated low-noise micro-current amplifier which is an amplifier circuit for amplifying micro-current of a reference measurement signal in a micro-coulometry analyzer. The isolated low-noise micro-current amplifier comprises an indicating electrode pair consisting of a reference electrode (12) and a measuring electrode (13) which are inserted into electrolyte, and an electronic switch A, and the isolated low-noise micro-current amplifier is characterized in that an energy amplifier (16) is arranged among the reference electrode (12), the measuring electrode (13) and the electronic switch A, and is used for amplifying a voltage signal for reflecting the concentration change of the electrolyte; the energy amplifier (16) mainly comprises a group of symmetrical positive and negative power supplies (22, 23) and a high input impedance operational amplifier (24); the output end of the electronic switch A outputs the voltage signal amplified by the energy amplifier (16). Therefore, the analysis precision of the micro-coulometry analyzer can be greatly improved, the 0.1ppm sample content can be detected under general analyzing and operating conditions, and the sample content greatly exceeds the detection lower limit of 0.2ppm specified in the industrial standard.
Owner:朱宝华
A Partial Coulometric Method for Determination of Biodegradable Organic Matter in Water
ActiveCN110530956BEasy to findGood linear correlationMaterial electrochemical variablesLinear correlationPollution
The invention belongs to the technical field of water environment chemical analysis, and in particular relates to a local coulometric method for measuring biochemically degradable organic matter in water bodies. The present invention finds a unique way to select the fastest point of voltage drop as the cut-off point of voltage collection. The cut-off point is easy to find and can greatly shorten the measurement time and improve the work efficiency. Moreover, the local Coulomb method of the cut-off point selection method is used. Oxygen BOM Q1 The linear correlation between the value and the concentration of GGA standard solution for cultivating electrogenic microorganisms is better, which provides a more scientific, reasonable and accurate test method for the determination of biodegradable organic matter in water by microbial fuel cells, and provides a new method for scientific control of water environmental pollution. The idea and direction of this paper have great promotion value and broad application prospects.
Owner:CHONGQING INST OF GREEN & INTELLIGENT TECH CHINESE ACADEMY OF SCI
Device for detecting moisture content in gaseous substances
PendingCN111855785ASimple structureLow priceMaterial electrochemical variablesData controlElectric power equipment
The invention discloses a device for detecting the moisture content in gaseous substances, relates to the technical field of maintenance and detection auxiliary equipment of power equipment, and aimsto solve the problem that a device for detecting the moisture content in gas based on Karl Fischer coulometry is not accurate enough. The device comprises a sample injection device, a detection deviceand a data control and calculation system which are connected in sequence. The sample injection device comprises a gas inlet, a pressure reducing valve, a gas flow controller and a gas-liquid contactdevice which are sequentially connected through pipelines. The gas-liquid contact device comprises a gas inlet pipeline and a gas outlet which is formed in the tail end of the gas inlet pipeline andarranged in an electrolytic tank, the lower end of the gas outlet is closed, and a plurality of micro holes are formed around the gas outlet. According to the invention, the accuracy of detecting themoisture content in gas by Karl Fischer coulometry can be improved.
Owner:STATE GRID CORP OF CHINA +1
PCB through hole tin layer thickness device and electrochemical timing coulometry testing method thereof
ActiveCN112577409AEasy to operateShort measurement timeElectrical/magnetic thickness measurementsMaterial electrochemical variablesEngineeringStructural engineering
The invention discloses a PCB through hole tin layer thickness device. The device comprises a solution, a solution tank, a to-be-measured PCB, an auxiliary electrode, an electrochemical workstation, areference electrode and a pressure-sensitive adhesive tape; the solution tank is arranged below the to-be-measured PCB; a hose is fixed to one side of a top cover of the solution tank; one end of thehose is located in the solution; the other end of the hose is connected with an inlet of a booster pump; a through hole is formed in the to-be-measured PCB; the pressure-sensitive adhesive tape is symmetrically arranged at the two ends of the through hole in the to-be-measured PCB; O-shaped rings are fixed to the sides, away from the to-be-measured PCB, of the pressure-sensitive adhesive tape; and the O-shaped rings at the upper end of the to-be-measured PCB are connected with the hose. The average tin thickness in the through hole with any hole diameter is measured by adopting a pressure-sensitive adhesive tape mask method and an electrochemical timing coulometry method; the method is suitable for quickly and accurately measuring the average tin thickness in through holes with all hole diameters of PCBs, is simple in operation, and small in measurement data error.
Owner:GUANGZHOU TERMBRAY ELECTRONICS TECH CO LTD
Method for testing trace moisture in dimethyl sulfoxide
ActiveCN102901764BShortened test resultsThe test result is accuratePreparing sample for investigationMaterial electrochemical variablesHydroxylamineAqueous ethanol
The invention provides a method for testing trace moisture in dimethyl sulfoxide. Prepared ethanol water is divided into two parts; a first part of the ethanol water is used for preparing a uniform transparent mixed system of dimethyl sulfoxide, hydroxylamine hydrochloride, the ethanol water and a Karl Fischer's reagent; and a second part of the ethanol water is used for comparison of moisture content with the uniform transparent mixed system of dimethyl sulfoxide, hydroxylamine hydrochloride, the ethanol water and the Karl Fischer's reagent. In the system where dimethyl sulfoxide and the Karl Fischer's reagent coexist, dimethyl sulfoxide has the capability of oxidizing I<-> ions and is reduced to be dimethyl thioether. According to the invention, since hydroxylamine hydrochloride in the Karl Fischer's reagent containing dimethyl sulfoxide is pre-oxidized by dimethyl sulfoxide, it is guaranteed that the I<-> ions are completely converted into I2 through an electrode, testing results are real, reliable and stable, and deficiency in testing of trace moisture in a dimethyl sulfoxide solution by using Karl Fischer coulometry is overcome.
Owner:XIAN KANGBEN MATERIAL
System for detecting and proactively balanced charging lithium ion battery pack
InactiveCN108123512AAchieving complete online balanceAchieve closed-loop evaluationCharge equalisation circuitElectrical testingElectrical batteryClosed loop
The invention relates to a lithium ion battery, in particular to a system for detecting and proactively balanced charging a lithium ion battery pack. The system comprises a series battery pack, a charging power supply, a battery voltage detection module, an energy overflow module, a master control module, a charging energy limiting control module, a switching module, a V-I conversion module, an I-V conversion module, an analog-to-digital converter, a controller, and a precision voltage reference device, wherein the series battery pack includes a plurality of batteries connected in series. Thesystem realizes online completely balance of the individual batteries in the battery pack, achieves coincidence of the same-capacity batteries with different charge and discharge curves, solves the inaccurate measurement caused by poor unit battery voltage detection accuracy in the battery pack and the disconnection of a series connection point detection line. By using a method for assessing the SOC of the overall battery pack by an individual battery coulometry and by integrating Kalman filter, the coulometry and the electromotive force method are combined to achieve the closed-loop evaluation of the SOC of the lithium ion battery, and the problem of inaccurate numerical value of the battery pack capacity evaluation is solved.
Owner:NINGBO FENGZHILI INFORMATION TECH CO LTD
A method for analyzing and detecting tritium produced by liquid lead-lithium alloy neutron irradiation
InactiveCN104849337BSmall amount of sampleHigh measurement accuracyPreparing sample for investigationMaterial electrochemical variablesNeutron irradiationIsotope
The invention relates to an analysis and detection method for the amount of tritium produced by liquid lead-lithium alloy neutron irradiation, including sampling, sample dissolution, separation and purification of lead and lithium, transformation of lithium-containing solution medium system, coulomb analysis, mass spectrometry analysis and data processing. step. The invention has the advantages of simple sample pretreatment procedure, high analysis result precision and the like. Since tritium is not directly measured, it is not necessary to extract and release tritium from the liquid lead-lithium alloy, which avoids the problem that tritium is closely combined with the liquid lead-lithium alloy and difficult to release. The main measurement value of the present invention is the isotope abundance ratio of lithium, and the diffusion, dissolution and retention of lithium atoms in the system space will not affect the measurement results of the tritium production of the liquid lead-lithium alloy, so the present invention overcomes the traditional direct measurement method that cannot be measured Problems with tritium entrapment and permeation in liquid lead-lithium alloy cladding systems for fusion reactors.
Owner:HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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