502 results about "Gaseous detection device" patented technology

A gas-detecting element comprising an oxygen-ion-conductive solid electrolyte substrate, a sensing electrode fixed onto said solid electrolyte substrate and active with a detection object gas and oxygen, and a reference electrode fixed onto said solid electrolyte substrate and active with at least oxygen, for detecting potential difference between the sensing electrode and the reference electrode to determine the concentration of the detection object gas, the sensing electrode and/or the reference electrode being covered by an electrode-coating layer made of an oxygen-ion-conductive solid electrolyte, and the electrode-coating layer having a portion bonded to the solid electrolyte substrate directly or via an electrode underlayer made of an oxygen-ion-conductive solid electrolyte.

The presence of a serviceable electrochemical gas sensor (1) in gas detecting apparatus is determined on the basis of the noise in the output of a sensor amplifier. A microcomputer (22) calculates mean, rms or variance values for the noise in the output of the amplifier (20) for successive periods. Each of these values is compared with the threshold and if it falls below the threshold, counter is incremented. When the counter reaches a target value, it is determined fault condition as arisen and an alarm (23) is operated.

A gas detector capable of accurately measuring particular components (odors or the like) contained in an ambient gas to be measured, being compact, and capable of being easily formed to be portable, or producing low noise and capable of being small-sized. Having zero gas cylinder (9) as a supplying unit of a zero gas and component parts disposed within its enclosure (2) and using syringe (3) as a gas intake/exhaust unit, it alternately introduces a test gas, i.e., an ambient gas taken in from outside enclosure (2) through piping (12a), and the zero gas supplied from zero gas cylinder (9) into sensor unit (7) and measures the test gas, while having operation of each unit controlled by data processor (11). Thus, accurate measurement of the test gas is achieved by relatively comparing results of measurement on the gases at each measurement. In addition, gas detector (1) can be moved to a spot where measurement is to be made to have the test gas there measured. Further, by use of a cylinder mechanism producing low noise, the detector can quantify gas intake/exhaust and can be made small in size.

A gas detection apparatus A comprises a signal processing circuit 20, a Wheatstone bridge circuit 21, integrating circuits 22 and 23, a differential amplification circuit 24, a direct current power supply circuit 25, a heater voltage application circuit 26. The Wheatstone bridge circuit 21 is configured of parallel combination of series circuits: one composed of a catalytic combustion type gas sensor 1 and a load resistor R1, and the other composed of a resistor R2, a variable resistor VR1 and a resistor R3. The heater voltage application circuit 26 is configured to generate a pulsed heater voltage by switching a direct current voltage of the direct current power supply circuit 25 through a transistor TR1 for applying the pulsed heater voltage to the Wheatstone bridge circuit 21. The integrating circuit 22 integrates a voltage at a connection point between the gas sensor 1 and the load resistor R1. The integrating circuit 23 integrates a voltage at a connection point between the variable resistor VR1 and the resistor R3. The differential amplification circuit 24 is configured to amplify a differential voltage between the output voltages of the integrating circuits 22 and 23. The signal processing circuit 20 is configured to determine a concentration of a flammable gas from an output voltage of the differential amplification circuit 24.

Methods and apparatus for providing a tunable absorption-emission band in a wavelength selective device are disclosed. A device for selectively absorbing incident electromagnetic radiation includes an electrically conductive surface layer including an arrangement of multiple surface elements. The surface layer is disposed at a nonzero height above a continuous electrically conductive layer. An electrically isolating intermediate layer defines a first surface that is in communication with the electrically conductive surface layer. The continuous electrically conductive backing layer is provided in communication with a second surface of the electrically isolating intermediate layer. When combined with an infrared source, the wavelength selective device emits infrared radiation in at least one narrow band determined by a resonance of the device. In some embodiments, the device includes a control feature that allows the resonance to be selectively modified. The device has broad applications including gas detection devices and infrared imaging.

A gas detection apparatus including a gas sensor element and a gas-sensor control circuit. The gas sensor element includes at least one sensor cell including a solid electrolyte member and a pair of electrodes, and external connection terminals electrically connected to the electrodes. The gas-sensor control circuit includes control terminals electrically connected to respective external connection terminals of the gas sensor element, an inspection current supply circuit for supplying an inspection current to an inspected terminal, which is a control terminal to be inspected for presence or absence of a short circuit to a predetermined potential, an inspection potential measurement circuit for measuring the potential of the inspected terminal, and an uninspected terminal impedance increasing circuit for increasing the impedance of the gas-sensor control circuit as viewed from an uninspected terminal, which is a control terminal other than the inspected terminal.

A multi-gas sensor device for the detection of dissolved hydrocarbon gases in oil-filled electrical equipment. The device comprising a semiconductor substrate, one or more catalytic metal gate-electrodes deposited on the surface of the semiconductor substrate operable for sensing various gases, and an ohmic contact deposited on the surface of the semiconductor substrate. The semiconductor substrate comprises one of GaN, SiC, AlN, InN, AlGaN, InGaN and AlInGaN. A method for sensing gas in an oil-filled reservoir of electrical equipment, comprising providing a sensor device, immersing the sensor device in the oil-filled reservoir, allowing the gases emitted from the oil to interact with the one or more catalytic metal gate-electrodes, altering the gas as it contacts the catalytic metal gate-electrodes and altering the sensitivity of the sensor.

A gas detecting apparatus and a method for detecting gas leaks are disclosed. The gas detecting apparatus includes an infrared (IR) detector configured to monitor a presence of one or more gases in a field-of-interest (FOI), wherein the IR detector generates IR light distribution information within the FOI to be analyzed to identify the presence of one or more gases for a gas leak detection; and a visible light projector configured to project a visible frame image that frames an outer edge of the FOI during the gas leak detection. The method for detecting gas leaks includes generating an infrared (IR) light distribution information within a field-of-interest (FOI) to be analyzed to identify the presence of one or more gases for a gas leak detection; and projecting with a visible light a visible frame image that frames an outer edge of the FOI during the gas leak detection.

The invention discloses a multi-variety and small-batch fruit and vegetable modified atmosphere packaging device and a multi-variety and small-batch fruit and vegetable modified atmosphere packaging technology. The modified atmosphere packaging device comprises an air compressor, a nitrogen making machine and a humidity control device which are connected in series, wherein the humidity control device is connected with a plurality of small air conditioning cabinets which are arranged in parallel; gas production detection holes, refrigerant inlets and refrigerant outlets of the plurality of small air conditioning cabinets are respectively connected with a gas detection device and a refrigerating unit; cable output holes of a temperature and humidity sensor are respectively connected with the input end of a control system; the control system is connected with the gas detection device, the air compressor, the nitrogen making machine and the humidity control device. The modified atmosphere packaging technology comprises the steps of confirming the air conditioning parameters of the small air conditioning cabinets; controlling the fresh-keeping temperature; controlling the nitrogen and the humidity of the air conditioning cabinets as well as the gas detection; detecting the gas content and the humidity in the air conditioning cabinets regularly. The device and the technology have the beneficial effects that the plurality of small air conditioning cabinets can be respectively used for carrying out preservation on the different fruits and vegetables in a classifying way, and the control system is used for respectively controlling the air conditioning parameters of the small air conditioning cabinets to be within the best range all the time, so that the aim of keeping the fruits and vegetables to be fresh for a long time can be achieved.

A gas detecting method includes heating a gas detector, formed of a gas sensing layer and an adsorption layer, for an oxygen adsorption period t₀ at an oxygen adsorption temperature T₀; heating the gas detector for a target gas adsorption period t₁ at a target gas adsorption temperature T₁ at which a target gas is adsorbed to the adsorption layer, heating the gas detector for a target gas desorption period t₂ at a target gas desorption temperature T₂ at which the target gas adsorbed to the adsorption layer is desorbed to move to the gas sensing layer; and calculating a gas concentration of the target gas from a sensor resistance of the gas sensing layer. A gas detecting device includes the gas detector and a drive processing unit configured to carry out the method.

The invention discloses a gas detection device and a detection method, and relates to the technical field of gas detection. The gas detection device comprises a microcontroller, a gas sensor which is used for detecting gas density and is connected with the microcontroller through an A/D sensor, a 9-axis attitude sensor which is used for acquiring and identifying information of human body attitudes and is connected with the microcontroller, a wireless communication module which is used for data communication and transmission and is connected with the microcontroller, and an intrinsic safety power source which is connected with the microcontroller and is used for supplying power supply to the gas detection device, wherein the microcontroller is used for acquiring the information of human body attitudes and then determining information of dangerous attitudes, an alarm signal is generated according to the information of dangerous attitudes, and data is transmitted through the wireless communication module, so that early alarm is realized in time. The gas detection device can be used for acquiring and identifying attitudes of a user and transferring early alarm signals in time, so that timely rescue is favored.

A method and a mobile terminal for gas detection warning are disclosed to solve the problem that people cannot detect gas by themselves due to the lack of a portable gas detecting apparatus. The mobile terminal is portable and typically includes a central control unit, a gas detection unit, a warning unit and a user interface unit. The apparatus performs a warning operation by using a warning policy corresponding to the detected air concentration by setting warning policies corresponding to a kind of gas in different concentration ranges respectively.

The invention aims at providing a gas detection device. The gas detection device particularly comprises an optical filter, a non-refrigeration infrared detector and an infrared lens, wherein a transmission wave section of the optical filter comprises an infrared absorption peak value wavelength containing corresponding a to-be-detected gas; the non-refrigeration infrared detector is used for acquiring and outputting infrared imaging information passing through the optical filter; the infrared lens is used for converging infrared rays of an object to the non-refrigeration infrared detector. Compared with the prior art, the gas detection device has the advantage that by combining the optical filter with the non-refrigeration infrared detector, the gas detection is achieved; compared with a gas detection device which utilizes infrared detectors such as a refrigeration infrared detector as a detector in the prior art, the gas detection device has the main beneficial technical effects that the refrigeration is omitted, the gas detection device is low in power consumption, small in size, rapid to start, convenient to carry, light, long in service life and low in cost, and the miniaturization is achieved; furthermore, a light path is simple and is easy to realize, and the production cost of equipment is further lowered and the like.

The invention proposes a method for etalon suppression in a gas detection device by determining an etalon fringe period during a calibration step without gas in dependency of the DC drive current. A measuring signal which is a function of the gas absorption and substantially independent of an intensity modulation of an initial light signal at an initial frequency (f) is generated by determining a first pre-measuring signal when the laser source is operated at the center of the gas absorption peak, a second pre-measuring signal when the laser source is operated with a DC drive current below the gas absorption peak of the gas to be detected, and a third pre-measuring signal when the laser source is operated with a DC drive current above said gas absorption peak, with a difference between said DC drive currents which corresponds to the etalon fringe period determined in a calibration step before. The final measuring signal is determined as the difference between the first pre-measuring signal and the arithmetic mean of the second pre-measuring signal and the third pre-measuring signal. This etalon fringe suppression allows to implement a substantial simplification of a reference channel in a gas detector, which does not require separate lock-in channels which analyse the detector signal either on the modulation frequency (f), or on twice the modulation frequency (2f).

A gas detection chamber in which a gas sensing element is provided to detect a component of a gas allowed into the gas detection chamber is heated by a heater, and an output of the heater is regulated by a heater regulator. The heater regulator is adapted to cause the heater to continue to heat the gas detection chamber (preferably but not necessarily, the output of the heater is caused to lower) when an anomaly detection device detects an anomaly of the gas sensing element.

The invention specifically relates to a safe disposal and resourceful utilization system for an energetic material and an implementation method for the system, belonging to the technical field of treatment of energetic materials. The system comprises a batching tank, a reaction tank, a material supplementing tank, an overflow recovery tank, a gas recovery tank, a compressor unit, a heating unit, a refrigerating unit, a gas detection device, a gas condensation device, a supersonic generator, a stirring device driven by a motor, a temperature test automatic control device, a pressure testing device, a pH value test automatic control device and an ion concentration detection device. The system is used for treatment of an energetic material to prepare a fertilizer which can be utilized by mankind through hydrolysis and conversion; in the process of preparation of a fertilizer, lead in a lead-containing energetic material is removed to reduce lead content in the fertilizer, so the content of lead absorbed by a crop from soil is reduced, thereby further alleviating harm to a human body caused by lead included in food.

The invention discloses a light tracking based oil shale pyrolysis gas detection device and method. The device comprises a gas sealing structure, a material putting mechanism and two mirror groups; each mirror group comprises two mutually vertical mirrors, a terahertz entrance window and a terahertz exit window, wherein the two mirrors are in linkage by an axis of rotation; terahertz wave enters from the entrance windows and exits from the exit windows after being reflected by the two mirror groups. The detection method is characterized in that a terahertz light path is constructed in an environment with set temperature and pressure and lies in that in the primary measuring range, the terahertz wave passes through the gas from the forward and backward directions respectively at two different moments and then is emitted in the space of a gas reactant. The device and the method have the advantages that the terahertz wave is introduced into pyrolysis tracking to detect the spectral information of the gas in the sealing structure; the dynamical characteristics of oil shale structure change are represented by utilizing the strength and phase change of a terahertz time-domain signal.

The invention relates to the field of foundation pit construction equipment, in particular to an integrated deep foundation pit operation intelligent machine. The problems of high equipment carrying difficulty and low safety performance are solved. The integrated deep foundation pit operation intelligent machine comprises a plurality of pithead supports, an installation frame is arranged on the pithead supports, an electric hoist is installed on the pithead supports through the installation frame, a control instrument box and a fan are further installed on the pithead supports, and the controlinstrument box is in circuit connection with the electric hoist, the fan and a gas detection device. The device integrates multiple functions of rapid and stable material lifting, real-time gas detection, intelligent air supply, automatic sound-light alarm, emergency lifting of constructors, differential mechanism hanging points and rope ladder hanging points, the life safety of the constructorsis guaranteed, the safety and reliability of construction machines and tools are improved, and the construction efficiency is improved.

The invention discloses a hydrogen fluoride gas detection device in internal GIS device comprising a detection system and a central processing system. The detection system comprises a sampling device and an F ion measurer. The sampling device comprises a gas inlet pipe, a sample inlet valve, a flow-meter, a fluorine ion absorber, and an absorption liquid feeding device. The fluorine ion absorber comprises a housing, a pressure sensor, and a gas inlet port and a liquid outlet port arranged on the bottom of the housing. The gas inlet pipe is connected with the gas inlet port of the housing. The sample inlet valve and the flow-meter are respectively arranged on the gas inlet pipe. A liquid outlet end of the absorption liquid feeding device communicates with a fluorine ion absorption chamber at the top of the housing. The F ion measurer comprises a water tank and a fluorine ion selection electrode. The liquid outlet port of fluorine ion absorption chamber extends into the water tank. The fluorine ion selection electrode is connected with the central processing system. The invention also discloses a method for quantitatively detecting hydrogen fluoride gas in internal GIS device by using the device. The device has high detection sensitivity upon hydrogen fluoride inside a GIS device, and has low sampling amount, such that GIS device normal operation is not influenced.

The invention relates to a pulse diagnosis device, a gas detection device, a pulse simulation device and a TCM diagnosis and treatment system, wherein the TCM diagnosis and treatment system includes a user side system, a doctor side system and a cloud server; the user side system includes a fiber grating pulse diagnosis device, a fiber optic gas detection device and a first Communication module, the first communication module is respectively connected with the output of the fiber grating pulse diagnosis device and the output of the fiber optic gas detection device; the doctor side system includes a fiber grating pulse diagnosis device, a pulse simulation device, an intelligent terminal and a second communication module, the second communication module Connected to the output of the pulse simulation device; the user-side system obtains the user's pulse signal and gas information, and sends it to the cloud server through the first communication module, and the cloud server sends the user's pulse signal and gas information to the doctor side through the second communication module The intelligent terminal of the system realizes remote TCM diagnosis and treatment.