808 results about "Carbon dioxide sensor" patented technology

A system for monitoring and modifying the quality and temperature of air within a conditioned space includes a blower unit, a damper unit for selectively admitting outside air into the conditioned space, a temperature moderating unit and a control unit. The control unit includes a thermostat and conventional temperature control apparatus for selectively activating the temperature moderating unit to maintain the desired temperature in the conditioned space. The control unit also incorporates CO2 concentration measuring and control apparatus which includes a small CO2 sensor. The CO2 sensor includes a cathode, an anode and a solid electrolyte disposed intermediate and electrically in contact with each of the cathode and the anode to effect a primary electrical cell. A heater and a heater thermostat serve to maintain the temperature of the cell at about 250° C. The cathode and anode materials and the chemical composition of the electrolyte are further selected such that the voltage generated across the heated cell varies in accordance with the CO2 concentration. CO2 concentration modifying apparatus is responsive to sensing a first predetermined CO2 concentration for turning on the blower unit and to sensing a second, higher, predetermined CO2 concentration for actuating the damper unit to admit outside air.

A capnograph which performs an analysis of the breath waveforms measured by the carbon dioxide sensor, interprets the results of this analysis, and outputs to the operator diagnostic information about the respiratory status of the patient, or about the adequacy of the breathing support provided to the patient. The instrument compares a number of parameters characteristic of the waveforms of the patient's breath with an internal library of the values of those parameters expected from normal waveforms stored in its memory. These parameters may either relate to specific features of the waveform in the time domain, or may characterize spectral components of the waveform in the frequency domain. The capnographic waveform analysis may be combined with further non-invasive measurements in order to provide an indication of the deviation of the value of EtCO2 from PaCO2.

A system and method of providing bi-level CPAP therapy is provided that incorporates an infrared carbon-dioxide sensor to determine whether a patient is inhaling or exhaling. Patient exhalation causes the infrared light to be absorbed, while patient inhalation reduces the presence of carbon-dioxide causes little or no absorption of carbon-dioxide. The level of carbon-dioxide in an associated patient breathing interface is monitored for thresholds that trigger higher CPAP pressure upon inhalation and lower CPAP pressure upon exhalation.

Embodiments of nanoelectronic sensors are described, including sensors for detecting analytes such as anesthesia gases, CO2 and the like in human breath. An integrated monitor system and disposable sensor unit is described which permits a number of different anesthetic agents to be identified and monitored, as well as concurrent monitoring of other breath species, such as CO2. The sensor unit may be configured to be compact, light weight, and inexpensive. Wireless embodiments provide such enhancements as remote monitoring. A simulator system for modeling the contents and conditions of human inhalation and exhalation with a selected mixture of a treatment agent is also described, particularly suited to the testing of sensors to be used in airway sampling.

A fuel control system for a gas turbine engine that includes a primary fuel circuit, a fuel tuning circuit, a plurality of combustors connected to the fuel tuning circuit, oxygen and carbon dioxide sensors in the exhaust stream and a feedback control loop operatively connected to the fuel tuning circuit and to the oxygen and carbon monoxide sensors which serve to control the precise amount of fuel and air being fed to each one of the plurality of combustors in the engine. A parallel array of control valves in a tuning fuel circuit connect to corresponding ones of the plurality of combustors in the gas turbine engine. The fuel control system thereby “fine tunes” the amount of fuel and air being fed to each combustor using data regarding the detected oxygen and carbon monoxide concentrations in the exhaust gas as provided through a feedback control loop.

An emergency life support system including a patient ventilator for mechanical breathing assistance; a capnograph to monitor CO2 for ventilation effectiveness; a pulse oximeter for measuring blood stream oxygen saturation; a carbon dioxide sensor; an electrocardiograph (ECG) to monitor cardiac performance; an infusion pump; and alarms and a data recorder. The preferred embodiment uses an oxygen generator to deliver oxygen, to generate electric power to run the ventilation system, and to warm IV fluids and resuscitated air. The generator has electronically controlled valves and a modified valve system that offers the ability to select the oxygen concentration in the air delivered to the patient.

A system and method of providing bi-level CPAP therapy is provided that incorporates an infrared carbon-dioxide sensor to determine whether a patient is inhaling or exhaling. Patient exhalation causes the infrared light to be absorbed, while patient inhalation reduces the presence of carbon-dioxide causes little or no absorption of carbon-dioxide The level of carbon-dioxide in an associated patient breathing interface is monitored for thresholds that trigger higher CPAP pressure upon inhalation and lower CPAP pressure upon exhalation.

A carbon oxide sensor having high sensitivity capable of reduction of influence of humidity is provided. A detection electrode and a counter electrode are provided on one side of an electrolyte, respectively. The detection electrode contains a metal oxide and a metal carbonate including plural components. The metal carbonate preferably contains a first component of alkali metal carbonate and a second component of at least one element selected from the group consisting of alkali earth metal carbonate, transition metal carbonate, zinc carbonate, cadmium carbonate, indium carbonate, lead carbonate and bismuth carbonate. Specifically, it is preferable to contain the first component including Li2CO3 and the second component including at least one element selected from the group consisting of BaCO3, CaCO3 and SrCO3.

The invention discloses an intelligent household control system, which includes a central control host computer and a user terminal, wherein the central control host computer is electrically connected with a camera, an infrared detector, a temperature and humidity sensor, an indoor floating sensor, an outdoor floating sensor, a carbon dioxide sensor, a brightness detector and a plurality of actuating mechanisms, wherein the user terminal in the intelligent household control system is communicated with the central control host computer through a home gateway, the home gateway serving as the core part of the intelligent household control system is integrated into an independent control software, and the user can achieve the real-time monitoring image through the camera by adopting the user terminal and utilizing the wired / wireless Internet network or the wireless mobile network as the information medium, so as to know the operation states of the appliances at any time to remotely control the appliances in the system and automatically manage all the things in the house.

A chemical vapor sensor is provided that passively measures a suspect chemical species of interest with high sensitivity and chemical specificity, for use with safety systems. A vapor concentrator amplifies a suspect chemical vapor concentration to a detectible level, for use with an infrared detector. Compensation is provided for environmental variations that may influence the passive measurement of the chemical vapor sensor. Environmental variations may include extrinsic vapors in the surrounding air, or air currents that divert the sample vapor as it drifts from the suspect vapor source to a sampling intake. In an example, ethanol vapor is measured and carbon dioxide tracer measurements are used to calculate an ethanol vapor measurement that is adjusted for environmental variations. In an aspect, a time artifact filter sets the output of the carbon dioxide sensor to match the time dependence of the ethanol sensor, to calculate blood alcohol concentration.

Improved carbon dioxide sensors are disclosed which are less sensitive to the moisture content of the environment and which are substantially insensitive to oxygen levels under normal working conditions. The CO2 sensor comprises a pH indicator and long-lived reference luminophore and a porous sol-gel matrix. Combined CO2 and O2sensors are also described. Further disclose are methods of printing sensor onto substrates.

The invention discloses a big data analysis based intelligent greenhouse control system and method. The system includes an air temperature and humidity sensor, a light intensity sensor, a carbon dioxide sensor, a soil temperature and humidity sensor, an equipment driving module, a CC2530, a ZigBee / WiFi gateway, a cloud server and a network camera; the air temperature and humidity sensor, the light intensity sensor, the carbon dioxide sensor and the soil temperature and humidity sensor are used for collecting the environment information of a greenhouse; the equipment driving module is used for adjusting the environment parameters of the greenhouse; the network camera is used for collecting the growth pictures of crops in the greenhouse; the CC2530 sends a control instruction to the equipment driving module; the equipment driving module transmits the control instruction to a ventilating fan, a sprinkling irrigation facility and a light supplementary lamp / light shading curtain, so that the environment parameters in the greenhouse can be adjusted; and the cloud server determines the growth demands of the crops according to the collected crop growth pictures, an information processing decision system and a convolutional neural network model. Through the growth environment demands of the planted crops analyzed based on big data and equipment that can automatically control and adjust the environment parameters according to the growth environment demands of the crops, manpower costs can be greatly saved, and the output of the crops can be enhanced.

There is provided a microchip-based differential-type carbon dioxide gas sensor for detecting dissolved carbon dioxide levels. It functions with at least one working electrode composed of an unbuffered hydrogel membrane containing a certain amount of sodium bicarbonate and a pH-sensitive gas-permeable membrane; and a reference electrode composed of a buffered hydrogel membrane and a pH-sensitive gas-permeable membrane. The unbuffered hydrogel membrane contains carbonic anhydrase, which reduces the time period for the hydration of carbon dioxide, thereby allowing the quick measurement of the level of carbon dioxide. In addition to being significantly improved in stabilization, sensing, and recovering time periods, the differential-type carbon dioxide gas sensor can be fabricated in small sizes and quickly measure levels of carbon dioxide dissolved in sample solution.

The invention discloses a greenhouse environment intelligent control and management system based on information acquisition. The system comprises various types of sensors arranged in a greenhouse, a memory, a display, a sound and light alarm apparatus and a communication device. The various types of sensors include air temperature sensors, air humidity sensors, illuminance sensors, carbon dioxide sensors, soil moisture sensors and soil temperature sensors, a sub-control single-chip microcomputer is arranged for each type of sensors, all the sub-control single-chip microcomputers are connected with a master control single-chip microcomputer, window shades and / or lighting devices are arranged on the top and the side faces of the greenhouse, an indoor air circulating device, an outdoor air circulating device, a spray irrigation device, a heating device and a cooling device are arranged in the greenhouse, and the window shades are driven by motors. Through the system, various types of environmental data of the greenhouse can be monitored, and environmental parameters of the greenhouse can be automatically adjusted accurately and rapidly according to information acquired by all the sensors.

The present invention relates to indoor air quality control equipment by utilizing ventilation system and its method. Its control equipment includes ventilation system and air purifier. Said ventilation system can be used for sucking outdoor air and discharging indoor air to implement indoor ventilation, and the air purifier can utilize filter system to raise indoor air quality. Its control method utilizes the devices of carbon dioxide sensor, dust sensor and gas sensor, etc. and adopts the measures of detecting carbon dioxide concentration and detecting indoor air pollution extent, etc. Besides, it also provides the concrete steps of said control method.

The invention relates to a fresh air machine and a control method of the fresh air machine. Layout of channels in a cabinet is reasonably arranged, an indoor and outdoor air opening and closing plate is controlled to be opened and closed through a first stepping motor, a fresh air bypass channel is controlled to be opened and closed through a second stepping motor, the suitable ventilation channel is selected according to data fed back by a sensing mechanism, and the fresh air machine operates without a heat exchanger on the condition of small difference between indoor temperature and outdoor temperature; a dust removal and sterilization mechanism, an air purification mechanism and a negative ion generator are arranged in the cabinet, bacteria and viruses can be efficiently killed, peculiar smell can be removed, and air entering a room can be purified. According to the control method, a circuit control panel is adopted for controlling an indoor temperature sensor and an outdoor temperature sensor in real time to detect indoor temperature values and outdoor temperature values to obtain the difference value between the indoor temperature and the outdoor temperature, a carbon dioxide sensor is controlled to detect the concentration value of carbon dioxide in the room, three intelligent control operation modes of the fresh air machine are provided, and while the service life of the heat exchanger serving as a key component is prolonged, the requirement for selecting the different air purification modes of a user is met. The fresh air machine is good in purification effect and fresh air effect.

The invention discloses a control method of a vehicle-mounted air conditioner and the vehicle-mounted air conditioner. The method includes the steps that a compartment is divided into a plurality of areas, a temperature sensor, a carbon dioxide sensor and a fan are installed in each area, and an external temperature sensor is installed in the position, away from a heat source, of the exterior of the compartment; after a vehicle is started, the air conditioner is started and the operating mode is determined according to the vehicle exterior environmental temperature detected by the external temperature sensor; the air speed gears of the fans in the corresponding areas are adjusted according to the carbon dioxide concentrations, detected by the carbon dioxide sensors, of all the areas; the set temperature is adjusted according to the current operating mode and the air speed gears of the fans in all the areas; and when the temperature sensor detects that the temperatures of multiple areas reach the set temperature, the air conditioner starts the shutdown mode, and the fans are kept at the current air speed gear. According to the control method of the vehicle-mounted air conditioner and the vehicle-mounted air conditioner, interior temperature and exterior temperature of the compartment are identified through the sensors, and the operating modes of the air conditioner are selected automatically; the number of passengers of different areas is judged based on the carbon dioxide concentrations in the vehicle, the air outlet volume is adjusted according to the areas, the requirements of passengers for cooling and heating are met anytime, and accordingly the comfort is improved.

An airway management device is provided that may adjust the inflation level of a cuff associated with an endotracheal tube. The cuff inflation may be adjusted in response to an increase in carbon dioxide levels above the cuff, which may indicate a poor seal of the cuff against the tracheal walls, as well in response to a measured intracuff pressure. By using information about the seal quality of the cuff together with information about the cuff pressure, the inflation of the cuff can be adjusted to minimize cuff inflation pressure while maintaining a high quality tracheal seal.

An IR sensor (1), especially a CO2 sensor, is described, having a filter arrangement (6), downstream of which there is arranged a detector arrangement (7), and an evaluating device (8) which is connected to the detector arrangement (7), the filter arrangement (6) having a first filter (9) and a second filter (10), which are configured as bandpass filters and each have a passband and of which the first filter (9) allows passage of a predetermined IR band and the second filter (10) does not, and the detector arrangement having two detectors (14, 15), each of which is associated with a filter (9, 10). The objective is to simplify the use of such an IR sensor. For that purpose, the passband of one filter (10) is arranged within the passband of the other filter (9) and the evaluating device (8) forms the difference of the signals (S1, S2) of the detectors (14, 15) and normalises it to the signal (S1) of a detector (14).

The invention discloses an in-car retention early warning adjusting system and method. The in-car retention early warning adjusting system comprises a detecting part, a control treatment part and an executing part. The in-car retention early warning adjusting system is characterized in that the detecting part is installed at a roof lamp and comprises a temperature sensor, a carbon dioxide sensor, a radar wave sensor and a sound sensor; an exploring port of the radar wave sensor is perpendicular to the ground, the exploring angle is adjusted to be in the mode that within a radar wave detecting range, radar waves do not transmit out of car windows while the radar waves cover seats; the sound sensor is internally provided with a capacitive electret microphone sensitive to sound, and the control treatment part comprises a single chip microcomputer, signal filter magnifying modules and an adjusting button; the single chip microcomputer is connected with the sensors of the detecting part one by one through the signal filter magnifying modules, and after signals detected by the sensors of the detecting part and signals input by the adjusting button are processed, grading control is conducted on the executing part. The in-car retention early warning adjusting system has the characteristics that the structure is simple, in-car retention organisms can be effectively stored, and the in-car environment comfort is intelligently adjusted and controlled.

A fire detector and method for generating an alarm signal in response to a fire uses an NDIR CO2 sensor to generate a detector signal based upon a 15μ absorption band of CO2 and generates an alarm signal when a signal processor receives the detector signal and a preselected criterion is met that is indicative of the onset of a fire based upon an analysis of the detector signal using a detection algorithm that relies upon a trending pattern of the detector signal such as recognizing a substantial drop in the detector signal strength. The NDIR CO2 sensor can also generate a reference detector signal based upon a 9.0μ neutral band with a FWHM=0.5μ while the signal processor utilizes a detection algorithm that is based upon a synchronized output signal representative of CO2 concentration to generate an alarm signal when a preselected criterion indicative of the onset of a fire is met.

The invention discloses a long distance ice temperature live keeping transport case which comprises a control region and a storage region, wherein a control system is arranged in the control region; the storage region is used for positioning a fish box; a plurality of multifunction sensors are evenly arranged on the top and four walls of the storage region at interval; a temperature sensor, a humidity sensor, an oxygen sensor and a carbon dioxide sensor are arranged on each multifunction sensor, and each multifunction sensor is connected with the control system through the sensor module; a temperature controller, a draught fan, a humidifier, an oxygen generator, a GPS module, a communication module, a water pump and a warning device are arranged in the control region. The long distance ice temperature live keeping transport case can effectively improve freshness retaining quality of the long-distance transport aquatic product, improve transport amount and reduce the transport cost, the fresh and alive aquatic product can be transported and stored under ice temperature live keeping condition and the transparency, technicalization and integration of cold chain management can be promoted.

The invention discloses an indoor air quality intelligent control system, which comprises a fresh air unit, a circulation unit and a mixing unit, wherein the fresh air unit is provided with a first fresh air fan, an auxiliary heater, a fresh air filter and a second fresh air fan, the circulation unit is provided with a circulation air filter and a circulation fan, the mixing unit is used for realizing the mixing of outdoor fresh air and indoor circulation air, electromagnetic purification modules are respectively arranged in the fresh air filter and the circulation air filter, all modules are respectively connected onto a driving circuit, the driving circuit is connected with a main controller, and an air quality sensor, a temperature and humidity sensor, a PM2.5 sensor, a carbon dioxide sensor, a press key input circuit and an LCD (liquid crystal display) display circuit are respectively connected onto the main controller. The indoor air quality intelligent control system has the effects that the regulation and control of the outdoor fresh air and the indoor circulation air are integrated, the structure of the system is simple and novel, the arrangement is compact, the installation is convenient, the treatment on the indoor air can be realized, the air quality can be ensured according to requirements, the harm to human bodies caused by outdoor pollution can be reduced, and the energy consumption is reduced.

A carbon dioxide sensor has an arithmetic unit 12 that predicts the minimum value of carbon dioxide concentration that is regulated by the diffusion of the atmosphere by judging that a signal from a carbon dioxide concentration sensing unit 1 indicates a declining tendency and a calibration unit 13 that updates the sensitivity correction factor based on the predicted minimum value. This permits quick calibration by eliminating the need to wait until the carbon dioxide concentration in any given environment reaches the minimum value.

The invention discloses an Internet of Things greenhouse agricultural growth monitoring system and relates to an agricultural growth monitoring system. The Internet of Things greenhouse agricultural growth monitoring system comprises a plant ecology sensing system, a meteorological environment sensing system, and an equipment control system. The plant ecology sensing system and the meteorological environment sensing system transmits acquired data to a host computer. The host computer controls the start and the stop of the equipment control system. The plant ecology sensing system comprises a plant stem flow gauge, a tree radial growth monitor, a chlorophyll content measuring sensor, a leaf thickness sensor, and a fruit expansion sensor. The meteorological environment sensing system comprises an air temperature sensor, an air humidity sensor, a soil temperature sensor, a soil humidity sensor, a carbon dioxide sensor, an in-greenhouse illumination sensor, an out-greenhouse illumination sensor, an out-greenhouse rainfall sensor, and an out-greenhouse wind direction and wind speed sensor. The Internet of Things greenhouse agricultural growth monitoring system guarantees optimum plant growth environment and state, saves production cost, and reduce production energy consumption.

The invention discloses a sensor group indoor air monitoring system, and belongs to the field of air monitoring. The indoor air monitoring system comprises a central processing unit, wherein the input end of the central processing unit is electrically connected with a data acquisition unit and a body controller through serial port lines; the input end of the data acquisition unit is electrically connected with a converter; the input end of the converter is electrically connected with the output ends of a carbon monoxide sensor, a formaldehyde sensor, a carbon dioxide sensor, a nitrogen dioxide sensor, a VOC (volatile organic compound) sensor, a temperature sensor and a humidity sensor respectively; and the output end of the central processing unit is electrically connected with a controller, an alarm and a video terminal through serial port lines respectively. The indoor air monitoring system uses multiple sensors to simultaneously detect multiple air data; the air quality is precisely displayed through the video terminal, and a user is reminded of paying attention to pollutant overdischarge in time through the alarm; a mobile terminal can realize remote control and monitoring; and manual calibration can be performed through a calibrator in case of inaccurate sensor measurement, thereby ensuring that the result is more accurate.