192 results about "Oxygen Measurement" patented technology

A photoelectrochemical assay apparatus for determining chemical oxygen demand (COD) of a water sample which consists of a) a measuring cell for holding a sample to be analysed b) a titanium dioxide nanoparticle photoelectric working electrode and a counter electrode disposed in said cell, c) a UV light source adapted to illuminate the photoelectric working electrode d) control means to control the illumination of the working electrode e) potential measuring means to measure the electrical potential at the working and counter electrodes f) analysis means to derive a measure of oxygen demand from the measurements made by the potential measuring means. The method of determining chemical oxygen demand of a water sample, comprises the steps of a) applying a constant potential bias to a photoelectrochemical cell, containing a supporting electrolyte solution; b) illuminating the working electrode with a UV light source and recording the background photocurrent produced at the working electrode from the supporting electrolyte solution; c) adding a water sample, to be analysed, to the photoelectrochemical cell; d) illuminating the working electrode with a UV light source and recording the total photocurrent produced; e) determining the chemical oxygen demand of the water sample according to the type of degradation conditions employed. The determination may be under exhaustive degradation conditions, in which all organics present in the water sample are oxidised or under non-exhaustive degradation conditions, in which the organics present in the water sample are partially oxidised.

The multi-aperture system of the present invention provides a retinal oximetry apparatus for determining the level of oxygen saturation in retinal vessels using a lenslet array comprising at least seven lenses for the simultaneous measurement of reflected light with at least three wavelengths and at least four polarization states. The multi-aperture system of the present invention further provides an apparatus for determining the level of oxygen saturation in retinal vessels using a lenslet array comprising at least ten lenses for the simultaneous measurement of reflected light with at least three wavelengths for oxygen measurement, at least three wavelengths for melanin content, and at least four polarization states. Methods of operating the same are also provided.

An apparatus for measuring physiologic tissues perfusion information including: a first device producing a first output indicative of blood flow of a patient; a second device producing a second output indicative of oxygen content of the blood; and a processor combining said first and said second outputs to produce a third output indicative of tissue perefusion.

An apparatus for measuring physiologic tissues perfusion information including: a first device producing a first output indicative of blood flow of a patient; a second device producing a second output indicative of oxygen content of the blood; and a processor combining said first and said second outputs to produce a third output indicative of tissue perefusion.

The present invention discloses a method and apparatus for eliminating interference in pulse oxygen measurement. The method comprises the steps of: collecting a first wavelength light and a second wavelength light transmitting through the object to be measured and converting collected optic signals into electric signals to form a plethysmogram; processing the plethysmogram so as to normalize it, in order to decompose the normalized plethysmogram into a combination of an ideal plethysmogram and noise, and expand the ideal plethysmogram by using functions that can make up a complete orthonormal system; eliminating the noise in the plethysmogram through differential operation; and restoring the plethysmogram free of noise through integral operation for calculating oxygen saturation. The apparatus comprises a collecting module, a processing module, a noise eliminating module, and a restoring module. The method and apparatus suitable for the measurement of oxygen saturation under weak perfusion and movement conditions.

The invention relates to a pharmaceutical wastewater advanced treatment system. The pharmaceutical wastewater advanced treatment system comprises a wastewater regulating tank, a coagulative precipitation tank, an ozone oxidation floatation tank, a packed-type anoxic / anaerobic reaction tank, an aerobiotic contact oxidation tank, a secondary sedimentation tank, an electrolytic tank, a countercurrent type biological aerated filter and a clear water tank, wherein the coagulative precipitation tank comprises a stirring mixing zone and a precipitation zone, the ozone oxidation floatation tank comprises a mixing zone and a separation zone, the packed-type anoxic / anaerobic reaction tank is divided into a facultative anaerobic section, an anoxic section and an anaerobic section by baffle plates, the aerobiotic contact oxidation tank is provided with a water inlet pipe and a water distribution triangle pyramid, an aeration regulation control system is arranged at the lower part of the water distribution triangle pyramid and comprises an aeration tray, an air blower and a dissolved oxygen measurement regulation control device, the electrolytic tank is divided into a left compartment and a right compartment which are respectively a positive electrode compartment and a negative electrode compartment, the bottoms of the positive electrode compartment and the negative electrode compartment are communicated, the middle upper parts of the positive electrode compartment and the negative electrode compartment are separated by baffles, and the positive electrode compartment and the negative electrode compartment are respectively provided with a positive electrode plate and a negative electrode plate, and the countercurrent type biological aerated filter comprises a downstream zone, an upstream zone and a sludge zone.

The invention discloses a dissolved oxygen intelligent transducer, comprising: a dissolved oxygen probe, a temperature electrical conductivity probe, an inciting signal source, a signal conditioning module, a transducer electronic data sheet (TEDS) memory, a microcontroller, a power module and a bus interface module. The dissolved oxygen intelligent transducer integrates the dissolved oxygen probe, the temperature electrical conductivity probe, the TEDS memory, the microcontroller and the bus interface module. The dissolved oxygen probe is used for collecting the dissolved oxygen signal of a water effluent body and the temperature electrical conductivity probe is used for collecting the temperature signal and the electrical conductivity signal, the microcontroller is used for calculating the dissolved oxygen content, the electrical conductivity, the temperature and the practical salinity according to the TEDS parameter memorized in the TEDS memory and the processed dissolved oxygen signal, the temperature signal and the electrical conductivity signal, and output the same by the bus interface module, thus realizing the temperature compensation and salinity compensation for the dissolved oxygen measurement and the online detection of the water body dissolved oxygen.

The invention particularly discloses a dual-pump flow-equalizing flue sampling device and a sampling method. The dual-pump flow-equalizing flue sampling device comprises a flue mixing tank, wherein a flue sampling gun and a flue lead-out pipe are arranged on the flue mixing tank and communicated with the flue mixing tank; the outlet end of the flue lead-out pipe is connected with a pump I, and a branch connected with a flue analyzer is also led out from the flue lead-out pipe; one end, communicated with the flue mixing tank, of the flue sampling gun is provided with a throttling device, and a filter is also arranged on the flue lead-out pipe. With the adoption of the dual-pump flow-equalizing flue sampling device and the sampling method, the flue flow of each measurement hole in a single sampling gun is equalized, and the accuracy of flue oxygen measurement is improved.

A system and method for measuring and controlling oxygen in a culture vessel utilizes a non-invasive oxygen sensor and an agitator. A controller controls the agitator based on feedback supplied by the oxygen sensor. The agitator is used to increase oxygen transport into the liquid phase thereby raising the level of oxygen in the culture medium. The agitator driven equilibration results in precise control of the culture medium oxygen.

The invention provides a plate oxygen sensor. The plate oxygen sensor comprises a heating body and an oxygen measurement body on the upper part of the heating body; the heating body comprises a heater substrate, two insulating layers above the heater substrate and a heating electrode clamped between the two insulating layers; the oxygen measurement body comprises a reference gas substrate, an oxygen measurement layer and a porous protective layer in turn from bottom to top; and the area of the insulating layers is smaller than that of the heater substrate, the area of the insulating layers is smaller than that of the reference gas substrate, and the edge of the heater substrate is contacted with that of the reference gas substrate. The invention also provides a preparation method for the plate oxygen sensor, which comprises superposition, hot pressing and sintering of the heating body and the oxygen measurement body. By reducing the size of the insulating layers, the reference gas substrate is combined with the heater substrate more closely, and the separation probability caused by co-firing is reduced, so that the plate oxygen sensor has good sealing property and high thermal shock resistance.

Oxygen levels in biological tissue or systems can be measured by the phosphorescence quenching method using phosphorescent porphyrin probes, also referred to as a dendritic oxygen probes, with controllable quenching parameters and defined biodistributions. Provided are a “next generation” of oxygen sensors with substantially improved phosphorescence emission for better imaging capabilities, ease of use, increasing the quantum efficiency (phosphorescence intensity) and extending their range of applicability including constructing a class of oxygen sensors for making measurements in organic media. In addition, provided are methods for synthesizing new porphyrin constructs in which the porphyrin is made less flexible and more planar, changing with decrease internal quenching, and thereby increasing the phosphorescence emission used for oxygen sensing. Additional methods are provided for structurally modifying the dendrimer used to encapsulate the porphyrin phosphor to provide internal quenching of singlet oxygen molecules formed during oxygen measurements.

The invention relates to an inert rendering method for preventing and / or extinguishing fires in enclosed spaces, wherein an oxygen-inhibiting gas is introduced into the target area in order to adjust a first basic level of inertion with a reduced oxygen content in comparison with natural conditions, and wherein an oxygen-inhibiting gas is further introduced in a gradual or sudden manner (in the case of a fire) into the target area in order to adjust one or more levels of inertion with a similarly reduced oxygen content. The invention also relates to a device for carrying out the method, comprising an oxygen-measuring device in the target area and a source of an oxygen-inhibiting gas. The aim of the invention is to provide an inert rendering method and device for carrying out said method enabling the storage of extinguishing gas needed to extinguish a fire in a simple, economical manner without having to resort to premises which are normally specially provided therefor.

The design and manufacture method of an oxygen concentration sensor made with silicon micromachining (a.k.a. MEMS, Micro Electro Mechanical Systems) process for applications of oxygen measurement with fast response time and low power consumption is disclosed in the present invention. The said silicon oxygen concentration sensor operates with an yttrium stabilized zirconia oxide amperometric cell supported on a membrane made of silicon nitride with a heat isolation cavity underneath or a silicon nitride membrane with silicon plug for mechanical strength enforcement.

The present invention provides for a method and device for monitoring an ambient humidity sensor in a combustion engine, where the monitoring of the ambient humidity sensor is made by comparing the ambient humidity measured by said humidity sensor and an ambient humidity determined from an oxygen measurement of at least another sensor in the engine system, such as a NOX, or Lambda and / or an oxygen sensor. Said comparison is made using an offset of the oxygen signal reading of said at least another sensor, in a fuel cut condition where the drift or offset of said another sensor is related to the variation of the ambient humidity.

The invention relates to a trace dissolved oxygen tester on-line calibrating device and a calibration method thereof. The method is based on the Faraday's law of electrolysis, and the device comprises a fiber filter, a flow control system, a Faraday electrolysis device, dissolved oxygen measurement equipment and a control device. The trace dissolved oxygen tester on-line calibrating device and the calibration method thereof are reliable in design theory, simple and convenient in method and great in operability. According to the trace dissolved oxygen tester on-line calibrating device and the calibration method thereof, field sample water is used, the process of preparing ultra-pure water is omitted, and the process of taking out an oxygen electrode is avoided through on-line calibration. Water electrolysis efficiency is measured on line, so that electrolysis efficiency variation caused by water sample variation and instability of an electrode can be tracked, and the calibration result can be more accurate and reliable. Calculation of electrolysis efficiency of the field sample water is applied to a high precision gauge pressure sensor, and accuracy of electrolysis efficiency calculation is guaranteed.

The present invention relates to system for calibration of gas sensors and more particularly, the present invention relates to a system for characterization and calibration of bosch zirconium oxide based modified lambda sensors used in oil fired boiler stack gas oxygen measurement.

A system includes a controller that has a processor configured to receive a first signal from a first oxygen sensor indicative of a first oxygen measurement, wherein the first oxygen sensor is disposed upstream of a catalytic converter system; and to receive a second signal from a second oxygen sensor indicative of a second oxygen measurement, wherein the second oxygen sensor is disposed downstream of the catalytic converter system; and to execute a catalyst estimator system, wherein the catalyst estimator system is configured to derive an oxygen storage estimate based on the first signal, the second signal, and a catalytic converter model. The processor is configured to derive a system oxygen storage setpoint for the catalytic converter system based on the catalytic converter model and the oxygen storage estimate.

The invention relates to a device for the determination of flow parameters of a fluid, in particular, the temperature and flow speed and changes therein, in a fluid flow for monitoring, a method for operating such a device, a determination method itself and a fire recognition or oxygen measuring device provided with such a device. The aim of the invention is the recognition of a slow or sudden blockage, crack or break in a pipe system (13) of an aspirative fire recognition device by means of a measurement technique, whereby an air flow sensor (1), operated with a constant excess temperature, is combined with a regulation algorithm, running in a microprocessor (4), for monitoring the fluid flow or the flow resistance in the pipe system (13). The required resistance of the air flow sensor (1) can thus be calculated according to an exact sensor calibration curve and a precise control loop (3) formed. The measured values recorded by the air flow sensor (1) are thus extremely reliable, such that changes in condition for the flow parameters provide information about the state of the pipe system (13) or the intake system.

The invention relates to a refuse leachate treatment system. The refuse leachate treatment system comprises a waste water regulating pond, a coagulating sedimentation pond, a packing-type anoxia anaerobic reaction pond, an electrolytic pond, an aerobic contact oxidation pond and a sand filter pond; the coagulating sedimentation pond comprises a mixing stirring area and a sedimentation area, the bottom of the mixing stirring area is provided with a waste water inlet pipe, the middle-upper part of the mixing stirring area is provided with a liquid charging system for charging a coagulating agent, and the middle part of the stirring area is provided with a stirring apparatus; the packing-type anoxia anaerobic reaction pond comprises an anoxic section, an anoxia section and an anaerobic section; the electrolytic pond is provided with a water inlet pipe and a water outlet pipe, the electrolytic pond is of a structure of two chambers in the left-right direction, i.e. a positive electrode chamber and a negative electrode chamber; the middle-lower part in the aerobic contact oxidation pond is provided with a water inlet pipe, the lower part of the water inlet pipe is provided with a water distribution triangular cone, the lower part of the water distribution triangular cone is provided with an aeration control system, and the aeration control system comprises an aeration disc, an air blower and a dissolved oxygen measurement control apparatus.

Methods and system are described for multi-parametric, non-invasive, and real-time assessment of blood perfusion and oxygenation in the fetal brain during labor and delivery of a fetus through a vaginal birth canal of a maternal pelvis, and include positioning a probe device in the maternal pelvis during active labor, transmitting and receiving a plurality of ultrasound (US) and photoacoustic (PA) signals between the probe device and fetal brain, displaying in real-time on an US machine communicatively coupled to the probe device one or more images of venous and arterial blood flow of respective blood vessels in the fetal brain, measuring oxygen saturation of the respective venous and arterial blood vessels based on data from the one or more images, and estimating the oxygen measurement in the fetal brain during active labor based on the measured oxygen saturation.

A device for determining flow parameters, particularly the temperature and flow speed and changes therein, in a fluid flow for monitoring and a fire recognition or oxygen measuring device provided with such a device are provided. A slow or sudden blockage, crack or break in a pipe system of an aspirative fire recognition device is recognized by a measurement technique, whereby an air flow sensor, operated with a constant excess temperature, is combined with a regulation algorithm, running in a microprocessor, for monitoring pipe system fluid flow or flow resistance. The required resistance of the air flow sensor can thus be calculated by an exact sensor calibration curve and a precise control loop formed. The measured values recorded by the air flow sensor are extremely reliable, such that changes in condition for the flow parameters provide information about the state of the pipe system or the intake system.

The invention provides a small-size oxygen measuring device based on a porous material gas cell, belongs to the field of oxygen measurement, and aims at solving the problems that miniaturization of a single device and integration of a multi-component and multi-point measuring system are difficult to carry out as a large-volume gas cell is adopted by an existing oxygen measuring instrument based on tunable diode laser absorption spectroscopy. According to the small-size oxygen measuring device, an output end of a signal acquisition controller is connected with an input end of a diode laser, output light of the diode laser enters an optical fiber by an optical fiber coupler, light output by the optical fiber is output by a beam collimator and enters to the porous material gas cell and then enters a detector by laser beams in the porous material gas cell, an electric signal output end of the detector is connected with an input end of amplifier, an output end of the amplifier is connected with an input end of a power divider, and the two output ends of the power divider are both connected with an input end of the signal acquisition controller by a phase lock. The small-size oxygen measuring device is used for measuring the concentration of oxygen.

The invention discloses a device and a method for automatically controlling blood occlusion of the carotid artery. The device is formed by an installation base plate, a slide support, an air pressure blocking module, an air pressure control module and n wireless blood oxygen measurement modules. The air pressure control module is installed in an air pressure control module guide groove of the slide support which is arranged in a slide support guide groove of the base plate. The air pressure blocking module is positioned below the air pressure control module and connected with the air pressure control module into a whole. The wireless blood oxygen measurement modules are used for calculating blood oxygen values. A single-chip microcomputer in the air pressure control module receives the blood oxygen values measured by the wireless blood oxygen measurement modules through wireless communication circuits, collects pressure of pressure sensors and automatically controls pressurization and pressure reduction of air pressure of the air pressure blocking module. The air pressure control module and single-chip microcomputers in the blood oxygen measurement modules control air pressure and blood oxygen measurement according to program control processes. By means of the method adopting wireless communication, structural design is simplified, redundant wire connection is eliminated, and the device is scientific, reliable, practical and good in effect.

A device for enriching air with oxygen in an aircraft, and a method for operating the device provides product gas enrichment with oxygen with minimum requirements. An oxygen measurement apparatus analyzing the product gas flow as well as a throughput sensor are provided in combination with a change-over device. A flow connection to an outlet channel is created in a first switch position, and a flow connection to a consumer conduit exists in a second switch position. A device for producing a change-over signal from the first switch position to the second switch position is provided if the determined oxygen output as a product of the product gas flow and the oxygen concentration has reached or exceeded a predefined threshold value.

The invention discloses a narrow-band Internet of Things based multifunctional health measurement system and method and aims to better meet multifunctional measurement requirements of users and achieve convenience in measurement. The system comprises an intelligent mobile terminal, a cloud server and an offline measurement module. The offline measurement module comprises a narrow-band Internet of Things NB-IoT information transceiving unit, a CPU (central processing unit) and a measurement service module. The measurement service module comprises at least one of a body temperature measurement unit, an electrocardiography measurement unit, a heart rate and blood oxygen measurement unit, a height measurement unit, a weight measurement unit, a body composition measurement unit, a display unit and an audio play unit. The intelligent mobile terminal is used for communication with the cloud server. The cloud server is used for communication with the intelligent mobile terminal and the NB-IoT information transceiving unit and sends control instructions to each unit of the measurement service module through the NB-IoT information transceiving unit.

The present invention discloses a method and apparatus for eliminating interference in pulse oxygen measurement. The method comprises the steps of: collecting a first wavelength light and a second wavelength light transmitting through the object to be measured and converting collected optic signals into electric signals to form a plethysmogram; processing the plethysmogram so as to normalize it, in order to decompose the normalized plethysmogram into a combination of an ideal plethysmogram and noise, and expand the ideal plethysmogram by using functions that can make up a complete orthonormal system; eliminating the noise in the plethysmogram through differential operation; and restoring the plethysmogram free of noise through integral operation for calculating oxygen saturation. The apparatus comprises a collecting module, a processing module, a noise eliminating module, and a restoring module. The method and apparatus suitable for the measurement of oxygen saturation under weak perfusion and movement conditions.

The invention relates to the technical field of medical electronics and in particular relates to a medical wristband with a self-compensation function and capable of offsetting blood oxygen measurement interference due to movements of a user when the user wears the wristband. Movement compensation is realized via gravitational acceleration, and interference factors produced during the daily use ofthe wristband can be eliminated; accurate and reliable blood oxygen saturation measurement can be achieved; a boss, mounted on the bottom of a wristband body, is keen to skin, so a temperature sensor, a photosensitive sensor and a light source projection window can be well applied to the wrist skin, and position of the wristband during the movement of the user can be positioned; and relative displacement between the temperature sensor and the photosensitive sensor and the wrist skin can be prevented, so measurement error during the movement can be reduced or eliminated.

A dissolved oxygen measurement system, and a method for calibrating a dissolved oxygen analyzer are provided. The method includes directing a pressurized cleaning fluid, having a known oxygen content, upon a sensing surface of a dissolved oxygen sensor disposed in a fluid. Then, the analyzer waits until the dissolved oxygen sensor response to the pressurized cleaning fluid is relatively stable, and stores a calibration value relative to the dissolved oxygen sensor response to the pressurized cleaning fluid. A dissolved oxygen measurement system is also provided. The system includes a dissolved oxygen sensor disposed in a fluid and a first source of a first compressed cleaning fluid that has a first dissolved oxygen content. A first valve is operably coupled to the first source and configured to selectively direct the first compressed cleaning fluid against a sensing surface of the dissolved oxygen sensor. A dissolved oxygen analyzer is coupled to the dissolved oxygen sensor and to the first valve and is configured to obtain a first calibration value related to the first dissolved oxygen content while the first valve directs the first cleaning fluid against the sensing surface.

The invention relates to a calibration method, a calibration system and a readable storage medium of a reflective oximeter and belongs to the technical field of blood oxygen measurement. A first bloodoxygen saturation detection value of a certain detection part of a detection object is monitored through a reference oximeter, when the first blood oxygen saturation detection value is smaller than or equal to a preset threshold value, the number of points to be fitted of the blood oxygen saturation in the detection object reaches the required number, and at the moment, the reflection oximeter which is synchronously obtained can be used for obtaining different blood oxygen saturation from dialysis according to the second blood oxygen saturation detection data of the detection part detected bythe emission oximeter, the second blood oxygen saturation detection data correspond to the second blood oxygen saturation detection data, the blood oxygen saturation of the reflection oximeter whichis larger than a preset threshold value is corrected and calibrated by using the corresponding relation, personal data can be calibrated, the blood oxygen saturation detection error caused by the individual difference of equipment of the reflection oximeter, the difference of physiological tissues of a human body and other factors is reduced, and the accuracy of the reflection oximeter in detecting the blood oxygen saturation is improved.