327 results about "Ion sensor" patented technology

An ion sening circuit comprises a bridge sensing circuit and a differential amplifying circuit. The bridge sensing circuit detects the ion concentration of the solution in the operation mode of constant voltage and constant current. The differential amplifying circuit compares the output of the bridge sensing circuit and a floating reference voltage, thereby the delivered voltage to the bridge sensing circuit, such that the opeation mode of constant voltage and constant current is formed accordingly. The main features of the disclosed circuit are that it grounds the reference electrode and floats the source terminal. The drawbacks of not being manufactured with intergrated circuits by CMOS technology and low benefits when applied to sensor arrays are avoided by the disclosed circuit.

A U-shape and/or nozzle-U-loop fermentor has a U-part consisting of an essentially vertical downstream part (2), an essentially vertical upstream part (4), a U-shape bend part (3) which connects the lower ends of the downstream and upstream parts, an inline pump (12) placed in the U-part for circulation of fermentation liquid in the fermentor, a top part (5) which is placed above the upper end of the downstream part, gas supply members (7, 8, 9, 10) which are provided in the U-part with appending static-mechanical mixing members (13, 14, 15, 16, 17) for the comminution of the gases introduced into the fermentation liquid, and supply numbers for water and nutrient salts (18) and (19), respectively, and in connection with the supply members (7, 8, 9, 10, 18, 19) or in by-pass arrangements in connection therewith one (or more) ion sensor(s) or analyser(s) (20, 21, 22, 23) for sensing the concentration of at least one of the ion species phosphate, ammonium, nitrate and hydrogen ion, oxygen sensor(s) for sensing the oxygen concentration, and at least one thermo phial for sensing the temperature, said sensor(s), analyser(s) and phial(s) delivering signals to a data processing system (PC), wherein the signals received are processed and the dosage of feed gases, water, minerals and pH adjustment means via the supply members (7, 8, 9, 10, 18, 19) are calculated and optimised from pre-programmed amounts relative to the results measured.

Devices and methods for measuring a target ion concentration uses an electrode pair. The pair includes a working electrode and a reference electrode. The working and reference electrodes are ion-selective electrodes (ISEs). The reference ISE can include a sodium ISE. The ISE pair interacts with body fluids where a target ion concentration changes more than sodium ion concentration over time. Some ISE membranes of a pair vary essentially only in the ionophore. An ISE pair can determine the ratio of a target ion concentration to sodium ion concentration in vivo. Periodic measurement of sodium concentration in drawn blood can be used to calibrate an ISE pair and provide target ion concentration as an output. Or, a potassium/sodium ISE pair beneficially monitors potassium concentration changes over time in heart- or kidney-failure patients. Then, manual or automatic titration of a diuretic material can be implemented to maintain a desired potassium concentration.

The invention discloses a full-solid potassium ion sensor, which comprises a substrate, a potassium ion selective electrode and an external reference electrode, wherein the potassium ion selective electrode and the external reference electrode are positioned in parallel on the substrate; both the potassium ion selective electrode and the external reference electrode comprise a reaction electrode,a contact electrode and a conductive lead for connecting the two electrodes; the reaction electrode is provided with an electrolyte layer; the electrolyte layer of the potassium ion selective electrode is provided with a potassium ion sensitive film; the electrolyte layer of the external reference electrode is provided with a reference film; and an insulating layer encircles the potassium ion sensitive film and the reference film and is provided with an opening for exposing the potassium ion sensitive film and the reference film, wherein the opening is used as a reaction area contacting solution to be detected during practical detection. The traditional potassium ion selective electrode and the traditional external reference electrode are integrated on the substrate, so the potassium ion sensor realizes microminiaturization and has the advantages of convenience for carrying, simple operation and rapid response. The invention also provides a preparation method for the full-solid potassium ion sensor. The preparation method simplifies the manufacturing flow, reduces the manufacturing cost and is suitable for mass production.

The ion sensors using TFT or MOSFET are low in the measurement sensitivity so that it is difficult to detect an extremely small amount of sensing-target substance. A TFT ion sensor includes both a gate electrode (a silicon substrate) and a reference electrode, in which the electrostatic capacitance of a gate insulating film (a thermal oxide film) is set to be larger than the electrostatic capacitance of an ion sensitive insulating film. Therefore, it is possible to detect the concentration of ions, hormones, and the like in a sensing-target substance from the shift in the threshold voltage of the gate-source voltage to source-drain current property.

An apparatus and methods of rendering an active implantable medical device (AIMD) fault tolerant when such an AIMD couples to a chronically implantable physiologic sensor (IPS) adapted to be operatively deployed into contact with body fluid and/or tissue. An exemplary AIMD for implementing the teaching of this disclosure includes implantable cardioverter-defibrillator (ICDs) incorporating implantable pulse generator (IPG) circuitry and/or therapeutic substance delivery devices. Certain aspects involve sensors such as blood-based sensors (e.g., a saturated oxygen sensor, a pH sensor, a potassium-ion sensor, a calcium-ion sensor, a lactate sensor, a metabolite sensor, a glucose sensor). Various mechanical sensors can be used according to the disclosure and in some forms, more than one sensor couples to an AIMD.

The invention discloses a lead ion specific detection sensor and a preparation method and a using method thereof. The sensor comprises a three-electrode system, wherein a glassy carbon electrode for depositing graphite, chitosan and Au nanoparticles is used as a working electrode of the system, a platinum sheet is used as a counter electrode, and a calomel electrode is used as a reference electrode. When in detection, in the three-electrode system in which the glassy carbon electrode for depositing graphite, chitosan and Au nanoparticles is used as the working electrode, the platinum sheet is used as the counter electrode and the calomel electrode is used as the reference electrode, an electrochemical workstation is used for performing constant-potential lead ion pre-enrichment; and after the enrichment is finished, the lead ion is detected by a differential pulse working mode. Through the detection sensor, simple and quick specific detection on the lead ion is realized; the lead ion with concentration as low as 0.01ug/L can be detected by the method; meanwhile, the lead ion sensor is simple to prepare, has stable performance and can be repeatedly used; and the sample detection time is short, and the operation is convenient.

The present discloses an ion sensor and its readout circuit. The sensor includes potentiometric, amperometric ion sensors or dual mode electrochemical sensor. The dual mode electrochemical sensors can be measured by the same measurement circuit system. The dual mode sensors are extended gate ion sensitive field effect transistors and amperometric biosensors. The measurement circuit system is adaptable to the different mode sensors.

The invention provides a monitoring system for monitoring durability deterioration evolution of a reinforced concrete structure. The monitoring system comprises a temperature sensor for measuring the internal temperature of concrete, a humidity sensor for measuring the internal humidity of the concrete, a pH sensor for measuring the pH value of the interior of the concrete, a chloride ion sensor for measuring the chloride ion concentration in the concrete, an oxygen sensor for measuring the oxygen concentration in the concrete, noble electrodes, a steel bar electrode, a solid-state reference electrode, an RFID device for radio frequency monitoring, and a stainless steel tank for storing the sensors and the electrodes. The monitoring system can predict the corrosion state of steel bars and predict the service life of the reinforced concrete structure more accurately, and can position the sensors more easily.

A method for forming atomic-scale contacts and atomic-scale gaps between two electrodes is disclosed. The method provides for applying a voltage between two electrodes in a circuit with a resistor. The applied voltage etches metal ions off one electrode and deposits the metal ions onto the second electrode. The metal ions are deposited on the sharpest point of the second electrode, causing the second electrode to grow towards the first electrode until an atomic-scale contact is formed. By increasing the magnitude of the resistor, the etching and deposition process will terminate prior to contact, forming an atomic-scale gap. The atomic-scale contacts and gaps formed according to this method are useful as a variety of nanosensors including chemical sensors, biosensors, hydrogen ion sensors, heavy metal ion sensors, magnetoresistive sensors, and molecular switches.

A gasket embedding an ion sensor 5 used for sealing a cylinder head to a cylinder block of an engine which is intervened under pressure between the cylinder head and the cylinder block, the gasket having a detection function of the condition in a combustion chamber. The gasket comprises a metal sheet in which a bore seal is formed at a ring-like bead structure and of an insulation seal layer coating at least the upper surface and the lower surface of the metal sheet so as to include the bead structure. An ionic current detection electrode is formed so as to project into the combustion chamber from the insulation seal layer and further a lug projecting outside from the periphery of the insulation seal layer is served as an ionic current introduction electrode of the sensor.

A method for the quantitative determination of an ion in a fluid which comprises subjecting the fluid to voltammetry using a sensing electrode which comprises an electrically conducting support having a surface which is coated with a support matrix, the support matrix containing an electroactive species capable of being oxidised or reduced to form a charged species, and an ionophore.

Provided is a rotatable disc-shaped microfluidic device which can electrochemically detect electrolytes comprised in a specimen. The microfluidic device including: a specimen chamber which accommodates a specimen; a detection chamber which receives the specimen from the specimen chamber; and an ion sensor which is formed in the detection chamber to electrochemically detect electrolytes in the specimen and includes an indicator electrode, a standard electrode and an ion selective film formed on a portion of the indicator electrode. The standard specimen is accommodated in the detection chamber, and a standard potential is measured. Then, the specimen is accommodated in the detection chamber, and a measurement potential is obtained to detect the concentration of the electrolytes comprised in the specimen.

The invention provides an amino functionalized graphene / chitosan composite NH2-G/Cs for electrochemical detection of heavy metal copper ion, and belongs to the technical field of composite materials. Graphite oxide as a raw material and ammonia as a reducing agent and a nitrogen source are subjected to a hydrothermal one-step reaction to obtain amino functionalized graphene; and then the amino functionalized graphene is treated by ultrasound dispersion into an acetate buffer solution of chitosan to obtain the NH2-G/Cs. Electrochemical performance tests show that the glassy carbon electrode modified by the NH2-G/Cs composite prepared by the invention can be used to detect heavy metal copper ions, not only achieves highly selective detection of copper ions but also has the excellent performances, which a single electrode does not have, and the characteristics of high detection sensitivity and good stability. Further, the invention has the advantages of cheap and easily available raw materials, environment friendliness, simple preparation process and low cost; and the composite is an ideal choice for the electrode material of heavy metal copper ion sensors.

A compound represented by the following general formula (I) or a salt thereof:

wherein R¹, R², R³, and R⁴ independently represent 2-quinolyl group which may be substituted, 1-isoquinolyl group which may be substituted, or 3-isoquinolyl group which may be substituted; m, n, p, and q independently represent 1 or 2; and L represents a single bond, or an alkylene group having 1 to 5 carbon atoms wherein said alkylene group may contain one or more heteroatoms in the main chain, and may have one or more substituents on the main chain, which is useful as a fluorescent zinc ion sensor.

The invention provides preparation and application of a mercury ion sensor based on photonic crystal enhanced fluorescence. The mercury ion sensor is composed of photonic crystal, a nucleic acid fluorescence molecular probe and a DNA assistant probe. The photonic crystal is used as a substrate, and strong affinity between thymidine (T) of DNA and Hg<2+> is employed to allow fluorescence group ROX labeled aptamer and a complementary sequence to compose a fluorescence detection system. A photonic crystal film is formed on a glass sheet substrate by prepared PS microspheres through vertical deposition self-assembly. Gold is sprayed on the surface of the photonic crystal; and based on Au-S bonding effect, mercapto group modified fluorescence group ROX labeled aptamer undergoes self-assembly on the surface of the photonic crystal, wherein the emission wavelength of ROX accords with the forbidden band of the photonic crystal, so fluorescence enhancing effect is achieved. According to the invention, fluorescence signal intensity of a nucleic acid fluorescence molecule is improved by using the principles of enhancement of fluorescence through the photonic crystal, so sensitivity and accuracy of sensor detection are improved.

An electronic circuit for ion sensor with the body effect reduction includes a bridge-type floating source circuit provided with an input terminal, an output terminal reflecting the change in the potential dependent on ion concentration, and an ion-sensitive field effect transistor (ISFET) wherein one terminal of the ISFET is coupled with the output terminal; a current mirror for providing a current to the bridge-type circuit; a third transistor for receiving the operating current provided by the current mirror, identical to the current provided to the ISFET; a differential amplifying circuit, wherein one input terminal of the amplifying circuit is input with a reference voltage, and the other input terminal is coupled with the output of the bridge-type readout circuit; and a third amplifier to generate a differential output voltage compensated for the body effect, temperature and time drift effects.

The invention discloses a compensating circuit and method for the concentration and temperature drift of a VOC gas sensor. The circuit comprises the VOC photoion sensor and an A/D converter. The VOC photoion sensor and the A/D converter are connected through a measuring bridge. The A/D converter is connected with a temperature sensor and a single-chip microcomputer. Standard gas of different concentrations is introduced into the VOC photoion gas sensor at room temperature, corresponding output voltage values are recorded, and the changing rule of the output voltage values along with the concentrations is determined; then, high and low temperature experiments are carried out, so a curve of the output voltage values along with the temperature drift is determined; the working temperature of an instrument is measured in real time through the temperature sensor, software compensation calculation is conducted on the VOC photoion gas sensor in the two dimensions including concentration and temperature through a single-chip microcomputer program, and the problem of measurement errors caused by the gas concentration and temperature drift of the VOC photoion gas sensor is solved.

The invention provides an in-situ dynamic monitoring system for internal microenvironment parameters of concrete. The system comprises a temperature sensor, a humidity sensor, an all-solid-state chloride ion sensor, an all-solid-state pH sensor, a macro battery pack sensor and a square frame, wherein the temperature sensor is used for measuring internal temperature of the concrete; the humidity sensor is used for measuring internal humidity of the concrete; the all-solid-state chloride ion sensor is used for measuring the content of chloride ions in the concrete; the all-solid-state pH sensor is used for measuring internal pH value of the concrete; the macro battery pack sensor is used for measuring the corrosion condition of reinforcing steel bars in the concrete; the square frame is used for connecting the sensors into a whole, has a fixing function and prevents sensor locations from being changed in a mounting process or a concentrate pouring process. The monitoring system is accurate in positioning, comprehensive in testing and easy to mount, further, the system is provided with a self-powered system and adopts solar power supply, batteries are not required to be changed regularly, and the system is convenient and efficient accordingly.