170 results about "Ph measurement" patented technology

A method of evaluating gastroparesis comprising the steps of providing an ingestible capsule having a pH sensor and a pressure sensor, having a subject ingest the capsule, recording pH measurements from the pH sensor as a function of time as the capsule moves through at least a portion of the gastrointestinal tract of the subject, recording pressure measurements from the pressure sensor as a function of time as the capsule moves through at least a portion of the gastrointestinal tract of the subject, determining the capsule's location at a first position in the gastrointestinal tract, deriving a pressure pattern as a function of time and the pressure measurements, providing a reference pressure pattern, and analyzing the subject's pressure pattern relative to the reference pressure pattern to evaluate the subject with respect to gastroparesis. The location may be the junction between the stomach and the small bowel of the subject. The pressure pattern may be the number of contractions relative to a baseline over a given time interval or area under the curve of pressure measurements over a given time interval.

The present invention relates to devices, methods, and kits for quickly and easily measuring and monitoring the pH of aquatic environments, such as lakes, streams, drinking waters, fisheries, aquariums, pools, hot-tubs, and spas. The current invention includes devices that are reusable and capable of monitoring the pH in a reversible fashion, thereby allowing continuous pH sensing without a need for the user to physically perform pH tests. Operation of the invention involves placing the device into the aquatic environment and optically detecting a color change in the membrane, for example, by looking at the device, when a pH measurement is desired. In addition, the device is both inexpensive and reusable, allowing the user to monitor the pH of various aquatic environment at minimal costs.

A buoyant water conditioner has a pH measurement system with a pH sensor, a pH measurement circuit, a display for displaying measured pH values, and a processor. After immersing the sensor in water of known pH value, the processor performs a calibration routine in response to the operation of a calibration switch. If the calibration succeeds, the sensor is immersed in water of unknown pH value, and the processor performs a pH measurement routine when a start switch is operated. Both routines include a delay period during which no pH values are displayed. If the calibration is not successful, the calibration routine is repeated until it succeeds. The calibration and start switches are mounted on an upper surface of the water conditioner housing. The system is powered by a solar cell battery or a chemical battery.

A method of determining the location of an ingested capsule comprising the steps of providing an ingestible capsule having a pH sensor and a pressure sensor, having a subject ingest the capsule, recording pH measurements from the pH sensor as a function of time as the capsule moves through at least a portion of the gastrointestinal tract of the subject, recording pressure measurements from the pressure sensor as a function of time as the capsule moves through at least a portion of the gastrointestinal tract of the subject, deriving a pressure pattern as a function of time and the pressure measurements, providing a reference pH, analyzing the pH variations for the subject relative to the reference pH to determine the capsule's location at a first position, providing a reference pressure pattern, and analyzing the pressure pattern variations for the subject relative to the pressure pattern reference to determine the capsule's location at a second position. The pressure pattern may be frequency of contractions relative to a baseline over a given time interval or motility index. The method may further comprise the steps of analyzing the pressure pattern variations for the subject relative to the pressure pattern reference in determining the capsule's location at the first position and / or analyzing the pH variations for the subject relative to the pH reference in determining the capsule's location at the second position.

A sensor probe for in-situ measurement of pH in a human tissue (e.g., cardiovascular) environment comprises a hollow needle having a tip and a back end. The tip is insertable through tissue into the tissue environment. An optic cable comprises a light conduit surrounded by a cladding. A first end of the light conduit not covered by the cladding is inserted from the back end of the needle and extends to within a predetermined distance of the tip to define a cavity within the tip. A porous dye layer is contained within the cavity adjacent to the first end of the light conduit, wherein the dye layer has a response to excitation light delivered through the light conduit that varies according to the pH of the tissue environment. An overcoat layer is deposited on the dye layer, wherein the overcoat layer is ionically permeable and substantially opaque at a light wavelength corresponding to the variable response of the dye layer.

A system, method and apparatus for determining a physiological condition within a mammal based on pH and / or temperature measurements. In one aspect, the invention is directed to a method of calibrating an apparatus for taking in vivo pH measurements comprising: a) providing a probe having an elongated housing extending along a longitudinal axis, a well formed in a top edge of the elongate housing for holding fluids, a pH sensor located on a floor of the well, the well located at a distal portion of the elongated housing; b) positioning the distal portion of the elongated housing on a base of a removable cap, the removable cap having a lid in an open position; c) supplying a liquid buffered to a known pH to the well and in contact with the pH sensor; d) moving the lid of the removable cap to a closed position so that the distal portion of the elongated housing is enclosed in a cavity of the removable cap, the cavity being substantially free of visible light; and e) calibrating the pH sensor to the known pH.

A vestibular electronic orthodontic appliance expediter constituted of a lingual sub-member and a buccal sub-member, the lingual sub-member arranged to fit a lingual contour of a gum of a patient, the buccal sub-member arranged to fit a buccal contour of a gum of the patient; a control circuitry; a power supply; a plurality of lingual electrodes, each associated with a particular tooth socket; and a plurality of buccal electrodes, each associated with a particular tooth socket. Either a first or a second type current is generated between lingual and buccal electrodes responsive to the control circuitry. Biochemical molecules involved in bone remodeling, augmented by the electric currents, may be applied to the expediter as a layer of gel containing those molecules on the expediter surface facing the gum tissue. Temperature control enhances the gel effects. pH measurement, as indicators of the cellular response to the combined treatment is further provided.

A method of measuring pH of aqueous liquid with little or no buffer present uses an electrochemical pH sensor which comprises a plurality of electrodes with a redox active organic compound attached to an electrode and having at least one functional group convertible electrochemically between reduced and oxidized forms with transfer of at least one proton between the compound and surrounding aqueous phase, wherein the compound has at least one substituent group which promotes hydrogen bonding at a said functional group and thereby increases the reaction rate of proton transfer. The substituent group may form an internal hydrogen bond with a redox-convertible group or may enhance polarity to promote electrostatic interaction with water molecules and reduce activation energy. Such an electrochemical sensor may be used for pH measurement in computer controlled equipment for processing an aqueous liquid.

The invention discloses an automatic three-spot calibration and temperature compensation method for a pH measurer. The method comprises the following steps of: preparing a composite glass electrode as a measuring electrode, using 0.05mol / L potassium hydrogen phthalate solution with the pH1 of 4.01 and the solution of 0.025mol / L monopotassium phosphate and 0.025mol / L disodium hydrogen phosphate with the pH2 of 9.18 to calibrate two spots, calculating a coefficient K by using a nemst equation, and calculating a constant E0 by using the solution of 0.025mol / L monopotassium phosphate and 0.025mol / L disodium hydrogen phosphate with the pH3 of 6.86; and saving the pH1, the pH2 and the pH3 of three types of standard buffer solution, corresponding electrodynamic force E1,E2 and E3, K and E0 in a storage module, reading the K and the E0 during measurement each time, and measuring a temperature value T', and calculating the pH value of the solution by using a formula. The method has the advantages that: the electrodynamic force E0 is eliminated, different pH measuring electrodes can be adapted, and the functions of automatically compensating the temperature in real time and the like are achieved.

The invention provides a metal-metal oxide pH electrode and a preparation method thereof. The method comprises the following steps of: using a chemically stable metal filament is used as a basal body, removing the original oxide film on the surface of the metal filament by mechanical polishing and chemical cleaning, and forming a IrOx (x=1 to 3) active oxide film sensitive to hydrogen ion on the treated metal filament surface with the thermal decomposition method. Comparing with glass pH electrode and conventional metal-metal oxide pH electrode, the inventive metal-metal oxide pH electrode has the advantages of simples preparation method, low cost, easiness for batch production, high mechanical strength, low fracture liability, small volume, high sensitivity of pH measurement, and rapid response speed, wide response range; and is suitable for pH measurement of low-temperature solution with wide pH range, particularly solution below zero degree (such as anti-freezing fluid and refrigerating fluid).

Innovative oral health monitoring technologies, which may be embodied in various apparatuses, systems, and methods, provide enhanced patient sample pH testing and other health data. The technologies may involve an oral health monitoring apparatus, which may include a mouthpiece housing, a pH sensor, and a wireless communication interface. The mouthpiece housing may be fitted to a mouth of a patient and may, by way of the pH sensor, capture saliva pH measurements. The technologies may involve wirelessly transmitting the measurements to a server for health condition correlation analyses, visual report generation, and subsequent display on a user device.

A wireless pH measurement system is disclosed, the wireless pH measurement system includes a portable module and a receiver end. The portable module comprises a signal detecting and processing portion and a wireless transmission portion. The signal detecting and processing portion comprises a sensor unit for detecting a pH signal, amplifying, filtering noise, analog / digital conversion and numerical processing to generate a pH measurement signal. The wireless transmission portion receives the pH measurement signal via a transmission interface and transmits by a Bluetooth module. The receiver end includes a Bluetooth receiver for receiving the pH measurement signal. The receiver end processes the pH measurement signal by programs, displays, analyzes and stores the pH measurement signal and transmits warning signal when an abnormal pH measurement signal is received.

The invention discloses a pH value measurement and control device based on a CAN bus gateway and a measurement and control method thereof. A remote monitoring computer visits the embedded type Web server of an embedded type CAN bus gateway by IE browser; the embedded type CAN bus gateway visits the pH measurement and control device by a CAN bus and requests real time data detected by the pH measurement and control device; the requested data are returned and sent to the CAN bus gateway by the CAN bus and are transmitted to the IE browser of the remote monitoring computer so as to display through a Ethernet by the web page of the Web server of the embedded type CAN bus gateway; at the same time, the remote monitoring computer displays page by IE browser and sends a control instruction to the pH measurement and control device through an Ethernet communication port, the embedded type CAN bus gateway and the CAN bus in regular turn so as to control the action of an electromagnetic valve and adjust the pH value of a detecting object. A production field infranet and an enterprise information network are interconnected by the method, which can effectively improve production efficiency, intellectualized monitoring level and the network management level of the enterprise.

A system of measuring pH of a solution having a calibration device to counteract time-drift effect. The calibration device of the system adjusts a compensation voltage to zero a measuring voltage of a first sensor and only respond to time-drift voltage of the first sensor. The calibration device has a differential operation amplifier receiving measuring voltages from the first sensor and a second sensor of the system to eliminate the time-drift voltages of the first and second sensors, thereby achieving calibration of the time-drift effects.

The invention discloses a multi-parameter water quality detection and rating system and a water quality rating method thereof. The system includes a data analysis module and several data acquisition modules; the data acquisition module includes an acquisition control unit, a solution temperature measurement unit, a solution pH measurement unit, a solution The turbidity measurement unit, the solution conductivity measurement unit, the power supply unit and the first communication unit; the data analysis module includes a data analysis control unit, a second communication unit, a display unit and a storage unit; the acquisition control unit is used to collect the collected solution temperature , pH, turbidity, and conductivity are sent to the second communication unit through the first communication unit; the data analysis unit is used to store the solution temperature, pH, turbidity, and conductivity received by the second communication unit into the storage unit for analysis. The water quality level of the solution, and the display unit is controlled to display the solution temperature, pH, turbidity, conductivity and water quality level. The invention has low cost, multiple parameters and high cost performance.

A pH measurement system using a glass pH sensor includes a power supply applying a voltage to the glass pH sensor through a resistor; a detector detecting the output voltage of the glass pH sensor; and a calculator calculating the pH of a solution based on the detected output voltage. The resistor provides a resistance of at least ten times less than the equivalent internal resistance of the glass pH sensor. The pH measurement system can improve the response rate by reducing the time constant depending on the dynamic characteristics of the glass pH sensor, and it is possible to diagnose whether the pH measurement system is defective or not by calculating the equivalent internal resistance and the supply voltage of the glass pH sensor.

The invention belongs to the technical field of photoanalysis and detection and particularly relates to application of 1-pyrenecarboxylic acid as a pH fluorescence probe to detection of a pH value of the solution and a pH value determination method based on the 1-pyrenecarboxylic acid fluorescence probe. The 1-pyrenecarboxylic acid is good in water solubility and capable of detecting the pH value in a water solution, thereby being a sensitive pH fluorescence probe; the 1-pyrenecarboxylic acid makes positive response to a to-be-determined solution with the pH value ranging from 2.0-6.0, thereby being applicable to pH value determination in an acid system; common metal ions have little effect on the characteristic of the 1-pyrenecarboxylic acid fluorescence probe for recognition of hydrogen ions. The application of the 1-pyrenecarboxylic acid as the pH fluorescence probe has the advantages that the shortcomings of low sensitivity, poor selectivity and proneness to being interfered by metal ions in an existing pH measurement method are overcome, and the 1-pyrenecarboxylic acid fluorescence probe is high in accuracy and sensitivity and wide in application range when used for detecting pH values of the solutions; currently, the 1-pyrenecarboxylic acid is commercialized, so that all-round popularization is facilitated.

A method for diagnosing constipation comprising the steps of providing an ingestible capsule (20) having a given density and a pH sensor (22) and a temperature sensor (24), having a subject ingest the capsule, recording pH measurements from the pH sensor as a function of time as the capsule moves through at least a portion of the gastrointestinal tract of the subject, transmitting the pH measurements to a processor (19) outside of the gastrointestinal tract of the subject, recording temperature measurements from the temperature sensor as a function of time as the capsule moves through at least a portion of the gastrointestinal tract of the subject, transmitting the temperature measurements to a processor (19) outside of the gastrointestinal tract of the subject, determining transit time of the capsule between a first location in the gastrointestinal tract of the subject and a second location in the gastrointestinal tract of the subject as a function of the pH measurements and the temperature measurements, providing a reference transit time that is a function of the density of the capsule, and comparing the determined transit time to the reference transit time to evaluate the subject for constipation.

The invention discloses an intelligent pH measurement and control system and a pH measurement and control method. The intelligent pH measurement and control system comprises a pH controller, a pH real-time data acquisition and curve recorder, an upper computer, a reaction container, an acid bottle, an alkali bottle, an acid dosing pump, an alkali dosing pump, a lower-limit relay, an upper-limit relay and a pH combined electrode arranged in the reaction container and used for detecting the pH value of a solution in the reaction container. The acid dosing pump and the alkali dosing pump are both peristaltic pumps. The alkali dosing pump is used for pumping alkali liquor in the alkali bottle into the reaction container. The acid dosing pump is used for pumping acid liquor stored in the acid bottle into the reaction container. The controller controls the alkali dosing pump to supplement the alkali liquor to the reaction container through the lower-limit relay and controls the acid dosing pump to supplement the acid liquor to the reaction container through the upper-limit relay so that the pH value in the reaction container can approach or reach a certain set pH value and be rapidly constant at the pH value. The intelligent pH measurement and control system and the pH measurement and control method are easy to implement and high in control accuracy.

The invention discloses a circulation-type automatic-cleaning pH measurement control device and method. The device comprises a pH value measurement washer, a signal matcher and a main control computer. The output end of a pH electrode is connected with the main control computer through the signal matcher; and an ultrasonic electrical signal of the main control computer is input to an ultrasonic transducer through a cable. The method comprises a cleaning step: an embedded computer periodically controls an ultrasonic signal generator to start so as to carry out cleaning on the pH electrode or controls the ultrasonic signal generator to start to carry out cleaning on the pH electrode based on voltage signals sent by the pH electrode. The problems of measurement data interruption in the cleaning process, no PID control function, unsatisfactory cleaning effect by adopting an air static pressure method, complex structure and many faults by adopting the cleaning method of a brush cooperating with cleaning fluid, damage to detected solution due to the need of adding chemical cleaning fluid in the cleaning process, and damage to the electrode due to exposure of the electrode in the air easily caused by cutoff of the detected solution and the like are solved.

The invention provides a red fluorescent silver nano-cluster probe as well as a preparation method and the application thereof. The red fluorescent silver nano-cluster probe is characterized in that captopril is adopted as a protective agent and sodium borohydride is adopted a reducing agent; and in an alkaline environment, a red fluorescent silver nano-cluster being uniform in size and high in stability is prepared. The preparation method has the advantages that the operation is simple, the cost is relatively low, the sources of raw materials are extensive, the raw materials are easy to obtain, and the repeatability is high. The prepared red fluorescent silver nano-cluster probe is high in water solubility and stability, and can be applied to pH measurement and temperature measurement in an acidic environment.

The invention provides a pH detection double compensating method for a soil matrix culture multi-parameter compound sensor. The water content theta is output by a water content sensor through a signal processing circuit, voltage E is output by a pH sensor through the signal processing circuit, and temperature T is output by a thermal resistance temperature sensor through the signal processing circuit; the water content theta is judged, if theta is smaller than 10%, the pH measurement result is incredible, the water content is increased, and measurement is carried out again until the water content theta is larger than 10%; if theta is smaller than 50% and larger than 10%, the pH measurement result is processed in a temperature and water content double compensating mode, and if theta is larger than 50%, the pH measurement result is processed in single temperature compensating mode. By means of temperature and water content compensation of the prepared pH detection soil matrix culture multi-parameter compound sensor, pH measurement adaptability and accuracy under different water content and temperature conditions are improved.

The invention relates to a method for improving degradation and aerobic composting of cow dung with earthworms and belongs to the field of agricultural techniques. The invention is characterized in that: the cow dung with a water content of 50% to 70% is collected after high-temperature fermentation stage and fed into a modified composting pond; the body of the composting pond is full of cow dung and the height of the cow dung pile is 0.4 m; 8000 to 15000 Daping No.2 earthworms are inoculated into the pond, and rice straws are coated on the surface of the pile after all the earthworms go into the pile and watered thoroughly; pile samples are collected for pH measurement during the culture process, and the range of pH suitable for earthworm growth is 6.5 to 8.5; after the inoculation is completed, the water is applied for 2 to 3 times every day to wet the rice straw coating, and the water content is controlled about 60% to about 70%; chickens are raised in chicken cages after the earthworms reproduce to a certain breeding amount; the reproduced earthworms are taken out of the pond and dried and pulverized to make fish feeds; the manures of the chickens and the manures of the earthworms are directly fed into the composting pond for composting, to increase the composting effect; and the reproduced earthworms are directly used to feed the chickens. Therefore, a complete agricultural ecological chain is formed.

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 relates to a pH value sensor based on a tilted fiber Bragg grating girdle amplification welding technology. The pH value sensor is based on the principles that the refractive index of a pH sensitive film is modulated by liquid pH value, the reflected cladding mode is regulated by the external refractive index and the Bragg reflection mode is not modulated by the external refractive index, and prepared by the girdle amplification welding technology. The pH value sensor comprises a broadband light source, a coupler, a tilted fiber Bragg grating, the pH sensitive film, and a photodiode. The cladding mode returned from the tilted fiber Bragg grating is performed with the girdle amplification welding technology, then transmitted by optical fiber core, converted into analog electric signals, and introduced into a data processing module; the strength of the cladding mode is measured to obtain the refractive index of the pH sensitive film, so as to obtain the pH value. The pH value sensor adopts the theory that the external temperature change only influences the wavelength of the reflective spectrum to drift within a small range, so that the influence to the measurement from the temperature change can be effectively avoided. At the same time, due to the characteristic that the Bragg reflection mode of the tilted fiber Bragg grating is not influenced by the external refractive index, the influence of the broadband light source fluctuation to the pH measurement result can be avoided.

A pH sensor may include a reference electrode including a p-channel field effect transistor (FET) whose gate includes a diamond surface having a hydrogen ion insensitive terminal, and a working electrode.