224 results about "Hydrogen sensor" patented technology

The invention relates to an optical fiber hydrogen sensor based on a silver film-nanowire hole array structure and a preparation method thereof in the field of photochemical sensors. The optical fiber hydrogen sensor comprises a multimode optical fiber, and a sensing area is formed on the multimode optical fiber; the sensing area is formed by stripping a coating layer with a preset length from the multimode optical fiber, thinning the optical fiber in the area, plating a silver film on the surface of the thinned optical fiber, and adsorbing a nanowire hole array structure which is sequentially and vertically arranged on the surface of the silver film in a liquid level self-assembly manner; the nanowire hole array is of a metal-medium-metal (MIM) structure, a gold-palladium nanowire array is arranged at the bottom, an intermediate medium layer is made of aluminum oxide, and a silver film with a hole array in any shape is arranged at the top. When light is transmitted to a sensing area from a fiber core of the multimode optical fiber, the light and a metal silver film can excite a surface plasmon resonance (SPR) effect, meanwhile, an MIM structure formed by a gold-palladium nanowire, an aluminum oxide dielectric layer and a porous silver film serves as an optical coupling antenna through a local surface plasmon resonance (LSPR) effect at the edge of a top hole, and the optical coupling antenna is used for transmitting the light to the sensing area. Light energy is efficiently converged and excited in an extremely bound gap plasmon (Gap Plasmon) in an aluminum oxide dielectric layer, so that far-unconventional electromagnetic field enhancement is generated in a sensing core area, and the sensitivity of the sensor is greatly improved.

The invention belongs to the technical field of hydrogen detection sensing, and particularly relates to an optical fiber hydrogen sensor for detecting hydrogen in water. The optical fiber hydrogen sensor consists of a demodulator and a hydrogen-sensitive optical fiber, wherein the hydrogen-sensitive optical fiber consists of an optical fiber, a WO3 / Pt layer and an ePTFE hydrophobic breathable film from inside to outside, wherein the WO3 / Pt layer is coated outside the optical fiber, and the ePTFE hydrophobic breathable film is coated outside the WO3 / Pt layer. The optical fiber hydrogen sensor is small in size, and the defect that a traditional hydrogen sensor is not suitable for a narrow space in a small chamber of a water electrolysis hydrogen production tank is overcome. The problems of spectrum jitter and abnormal interference caused by the fact that a traditional optical fiber hydrogen sensor is affected by water in an electrolytic bath environment are solved through the hydrophobic breathable film. The hydrogen sensor disclosed by the invention provides a real-time and stable quantitative means for solving the problem that hydrogen concentration cannot be effectively measured due to mixing of hydrogen and oxygen in a small chamber, a water outlet and an oxygen outlet of a water electrolysis hydrogen production tank.

The invention discloses an auxiliary device for hydrogen production by water electrolysis, which relates to the technical field of hydrogen production by water electrolysis and is characterized by comprising a base frame, a water inlet pretreatment unit, an electrolysis unit, a gas-liquid separation and gas monitoring module and an intelligent operation regulation and control unit. The inlet water pretreatment unit is used for deeply purifying a water source through a multi-stage filtering device to produce deionized water meeting the electrolysis requirement; the electrolysis unit electrolyzes the purified water into a gas-liquid mixture of hydrogen, oxygen and water vapor; the gas-liquid separation and gas monitoring module adopts a vertical separation structure and a secondary separation system, and is combined with a hydrogen side oxygen sensor and an oxygen side hydrogen sensor to realize efficient gas-liquid separation and real-time gas purity monitoring; the intelligent operation regulation and control unit dynamically regulates electrolysis parameters and gas pipeline states based on monitoring data, and automatic closed-loop control is achieved. The device has the advantages of thorough water purification, high gas purity, safe and reliable operation, intelligent control and the like.

The invention discloses an optical fiber twinning controllable vernier hydrogen sensor and a detection method, and belongs to the technical field of optical fiber sensing, the optical fiber twinning controllable vernier hydrogen sensor comprises a single-mode optical fiber, a femtosecond laser direct writing grating, a Fabry-Perot interferometer and a Pd / WO3 hydrogen sensitive film; the single-mode optical fiber comprises an optical fiber core and an optical fiber cladding, the femtosecond laser direct writing grating is prepared in the optical fiber core, the Fabry-Perot interferometer is composed of a reflecting surface 1 and a reflecting surface 2 which are relatively parallel to each other, the Pd / WO3 hydrogen sensitive film is coated on the inner side of the reflecting surface 2, and the femtosecond laser direct writing grating and the Fabry-Perot interferometer are arranged in series; the optical path of the Fabry-Perot interferometer is modulated through the interaction of the Pd / WO3 hydrogen sensitive film and hydrogen, interference spectrum wavelength drift is triggered, temperature compensation is achieved in combination with the temperature response of the femtosecond laser direct writing grating, and hydrogen concentration sensing is completed. The method is suitable for hydrogen leakage detection in industrial environments, energy equipment and other scenes.

The invention discloses a high-sensitivity double Fabry-Perot interference hydrogen sensor resistant to temperature and humidity interference, and belongs to the technical field of optical fiber sensing. A modular integrated design is adopted, and the core comprises double Fabry-Perot interferometers which are connected in series and are respectively a temperature compensation unit FPI-1 and a hydrogen sensing unit FPI-2, and a matched software controllable vernier processing module; the FPI-1 realizes temperature real-time compensation by filling PDMS in an open microcavity, and the FPI-2 adopts a PDMS / Pd-WO3 composite material as a hydrogen sensitive layer, and has wide humidity range anti-interference capability through structural optimization; the weak hydrogen signal is amplified through Fourier transform filtering, sine function fitting, twin interference spectrum construction and vernier effect. According to the invention, precise detection of ultra-trace hydrogen in a complex temperature and humidity environment is realized, and the temperature and humidity interference resistance is high.

The invention belongs to the field of hydrogen sensors, and particularly relates to an MEMS hydrogen sensor based on a high-entropy alloy and a preparation method of the MEMS hydrogen sensor. The hydrogen sensor comprises an insulating substrate, an interdigital electrode and a hydrogen sensitive layer, the hydrogen sensitive layer is formed by compounding high-entropy alloy nanoparticles composed of at least five transition metal elements and a semiconductor metal oxide substrate, and the high-entropy alloy nanoparticles are uniformly dispersed on the surface of the semiconductor metal oxide substrate to form a heterojunction; the atomic percent of each transition metal element in the high-entropy alloy nanoparticles is 5%-35%; the semiconductor metal oxide substrate is of a SnO2 or ZnO nano structure, and the specific surface area is larger than or equal to 50 m < 2 > / g. The preparation method is the preparation method of the hydrogen sensor. The hydrogen sensor provided by the invention has an ultralow hydrogen detection limit, the response speed is within a second level, the consumption of noble metal is greatly reduced, and the activity attenuation in a high-temperature environment is small.

The invention discloses a hydrogen concentration measurement method based on a multi-mode sensor, and relates to the technical field of gas detection and industrial process safety monitoring. Hydrogen sensors based on different physical principles are introduced in the same measurement link, and environmental variables such as temperature, humidity, pressure and the like and sensor output are collected together; a multi-dimensional feature is formed after normalization and time alignment, and then fusion is performed by using a weight adaptive to the change of an environment, so that instantaneous errors generated by a single sensor due to temperature drift, wet drift or pressure fluctuation are shared or suppressed, and the stability and repeatability of a fusion result are improved; furthermore, a cross sensitivity compensation module arranged before fusion identifies response differences between hydrogen and interference components such as carbon monoxide and methane by using a machine learning model obtained by training under a multi-gas mixing working condition, and the probability of false signals and false alarms caused by coexisting gas is reduced on the premise that a special detection channel is not added.

The invention discloses a hydrogen sensor based on a fiber bragg grating. An optical fiber core part of a sensing optical fiber is a circular cross section and is divided into two half parts, a first Bragg grating and a second Bragg grating with different grating periods are respectively engraved, an optical fiber cladding is D-shaped, and a hydrogen-sensitive coating is arranged on a flat peripheral surface. The inner diameter of the capillary tube is 0.8-1.2 mm, the outer diameter of the capillary tube is 4-6mm, the side wall of the capillary tube is provided with a hydrogen inlet / outlet through hole, and the sensing optical fiber is fixed on the inner wall of the capillary tube and is The sensor inner shell is provided with a first hydrogen inlet and a first hydrogen outlet, and a filter screen is arranged at the inlet and forms a hydrogen inlet and outlet channel together with the sensor outer shell. The sensor utilizes the hydrogen-sensitive coating to adsorb hydrogen and expand, so that the optical fiber core part is strained, and the central wavelength of reflected light of the Bragg grating shifts to detect the hydrogen concentration. The sensor has the advantages of strong electromagnetic interference resistance, high sensitivity, good stability, fast response and the like, and can be widely applied to concentration monitoring of hydrogen related production, storage, transportation and other scenes.

The invention discloses a surface plasmon resonance (SPR) hydrogen sensor based on an Ag / PDMS / Pt-WO3 multilayer structure. The SPR hydrogen sensor is characterized by comprising a halogen lamp light source, two sections of multimode optical fibers, a spectrometer and an SPR hydrogen sensing head, wherein the SPR hydrogen sensing head is composed of a different-core structure formed by multimode-single-mode-multimode optical fibers, a silver film, PDMS (polydimethylsiloxane) and Pt-WO3 (platinum-tungsten trioxide). The SPR hydrogen sensor based on the Ag / PDMS / Pt-WO3 multi-layer structure, which is simple to prepare, high in sensitivity and capable of being repeatedly used for a long time, is provided aiming at the defects that an existing optical fiber SPR hydrogen sensor is low in sensitivity and complex in device manufacturing, and PdH is changed from an alpha phase to a beta phase when Pd is used as a hydrogen sensitive material, so that the use of the device is influenced, and the like. When the hydrogen concentration is increased, the Pt-WO3 reacts with the hydrogen to generate heat, so that the refractive index of the PDMS film is changed, the SPR resonance spectrum is moved, and the hydrogen concentration is obtained by observing the offset of the PDMS film. The high refractive index sensitivity of SPR is brought into full play by utilizing the high refractive index change of PDMS, so that high-precision detection of hydrogen leakage is realized.

The invention discloses a surface acoustic wave hydrogen sensor based on a platinum and graphene composite film and a manufacturing method thereof, and belongs to the technical field of gas sensors, the surface acoustic wave hydrogen sensor comprises a piezo-electric crystal, the piezo-electric crystal is oppositely provided with a first interdigital transducer and a second interdigital transducer, a graphene film is deposited on the piezoelectric crystal and located on a sound propagation path between the first interdigital transducer and the second interdigital transducer, a platinum catalyst layer film is deposited on the surface of the graphene film, and the first interdigital transducer and the second interdigital transducer are connected with an external circuit through metal pins. The external circuit comprises a signal generator, a frequency meter and a data acquisition system, the signal generator generates an excitation signal and transmits the excitation signal to the first interdigital transducer through the metal pin, and a detection signal generated by the interdigital transducers is received by the data acquisition system and then is detected and compared through the frequency meter. The problems that an existing pure graphene hydrogen sensor is low in sensitivity, poor in selectivity and slow in response time can be solved.

The invention discloses a lithium battery energy storage power station fire protection monitoring and early warning method based on PACK-level two-fluid fire protection, belongs to the technical field of energy storage battery safety, and realizes comprehensive efficiency improvement through multi-level cooperative operation. According to the monitoring level, a cluster-level hydrogen sensor is used for capturing a thermal runaway early signal, complementary monitoring is formed in cooperation with a cabin-level multi-type sensor, accurate positioning and early warning of a fault pack are achieved while sensor configuration is simplified, and therefore invalid monitoring and potential safety hazards are reduced. A pack-level double-fluid system is innovatively adopted in the fire-fighting level, the synergistic effect of gas and water is combined, the fire extinguishing efficiency and equipment protection are both considered, and the limitation of a traditional single fire extinguishing mode is avoided; and meanwhile, a cluster-level and cabin-level grading fire-fighting mechanism is constructed, corresponding equipment is started according to early warning level differentiation, and excessive consumption of a fire extinguishing agent and scrapping loss of normal batteries are reduced. In addition, through dynamic monitoring and closed-loop control in the fire fighting process, it is ensured that fire extinguishing treatment is thorough and not excessive.

The present invention relates to a diagnostic system for hydrogen gas facilities based on optical sensors, and more specifically, to a diagnostic system for hydrogen gas facilities based on optical sensors that integrates a line-type optical vibration and temperature sensor laid along an extended path of a hydrogen gas facility with a point-type optical hydrogen sensor installed at a key location, and applies Edge-AI technology to monitor various abnormal signs such as excavation, impact, and hydrogen leakage in real time, and precisely diagnose and predict potential risks.

The invention provides a hydrogen sensor as well as a preparation method and application thereof, and particularly relates to the technical field of sensors. The hydrogen sensor comprises a ceramic substrate electrode and a gas-sensitive layer, the gas-sensitive layer is arranged on the surface of the ceramic substrate electrode, the gas-sensitive layer comprises a composite material formed by doping a semiconductor material with precious metal, the surface of the composite material is coated with a hydrophobic membrane, and the surface of the hydrophobic membrane is coated with a metal layer. The hydrophobic membrane is formed by chemical coupling reaction of hydrophobic silane and hydroxyl groups. According to the hydrogen sensor, by adopting the specific semiconductor sensing material and the hydrophobic membrane, the adaptability and the stability of the hydrogen sensor in a high-temperature alkali liquor corrosion environment are greatly improved, the hydrogen sensor can reliably work for a long time in a severe environment, the replacement frequency of the sensor is reduced, and the use cost is reduced.

The invention relates to a modularized electric power inspection unmanned aerial vehicle capable of rapidly replacing a hydrogen bottle, the modularized electric power inspection unmanned aerial vehicle comprises an unmanned aerial vehicle assembly and a gas detection assembly, the unmanned aerial vehicle assembly comprises a vehicle body, a connecting rod, a containing box body, a middle box, a supporting frame, a mounting cylinder, a vent hole, a motor and a hydrogen sensor, and integration of unmanned aerial vehicle flight and hydrogen detection functions is achieved. Through the remote sampling function of the gas detection assembly, the unmanned aerial vehicle can complete detection operation without approaching a high-voltage power grid in a short distance, the probability of collision with the power grid can be remarkably reduced, risks of electric shock and power grid short circuit are avoided fundamentally, and the safety of the unmanned aerial vehicle and stable operation of a power plant are guaranteed.

An apparatus and method for controlling a fuel electrode exhaust valve of a fuel cell system are disclosed, wherein the apparatus includes a hydrogen sensor configured to measure a concentration of hydrogen released by opening the fuel electrode exhaust valve, a first pressure sensor configured to measure an inlet pressure of the fuel electrode exhaust valve, a second pressure sensor configured to measure an outlet pressure of the fuel electrode exhaust valve, and a controller configured to control an opening area of the fuel electrode exhaust valve to a maximum value when exhausting condensate, and to control the opening area of the fuel electrode exhaust valve based on a difference between the inlet pressure and the outlet pressure of the fuel electrode exhaust valve when purging hydrogen.

This hydrogen-powered electric vehicle comprises an electric drive unit for driving at least one drive wheel of the vehicle, at least one electrical energy storage battery, at least one fuel cell module, a hydrogen tank for the fuel cell, and a hydrogen circuit connected to the tank, including components through which hydrogen circulates. It includes a set of hollow guide conduits (12, 13), each having a first end (14) opening at a component of the hydrogen circuit and a second accessible end. Figure for the abbreviation: Fig 2

The invention discloses a Pd / WO3-x-based ppb-level dual-signal hydrogen sensor and a manufacturing method thereof, and belongs to the technical field of sensor preparation. The sensor sequentially comprises a single-pass anodic aluminum oxide substrate, an anoxic tungsten oxide (WO3-x) hydrogen sensitive layer, a thin Pd color-changing catalyst layer, a thick Pd resistance catalyst layer and an electrode layer from bottom to top, and the electrode layer is any one of Ag, Au, Cu and Al. The hydrogen sensor provided by the invention has the advantages of high sensitivity, ppb-level detection lower limit, low processing difficulty and mutual verification of resistance-chromatic aberration double signals, and provides a new thought for the design of a sensor substrate.

The present application relates to hydrogen sensing material and functional film technical field, disclose a kind of TiVZrMnFeNi high-entropy alloy hydrogen sensitive film, the high-entropy alloy hydrogen sensitive film each element includes by atomic percentage:Ti 12~18 at.%, V 22~28 at.%, Zr 12~18 at.%, Mn 12~18 at.%, Fe 12~18 at.%, Ni 12~18 at.%.The present application also discloses a kind of preparation method of the TiVZrMnFeNi high-entropy alloy hydrogen sensitive film and based on the hydrogen sensor of the TiVZrMnFeNi high-entropy alloy hydrogen sensitive film.The present application uses TiVZrMnFeNi high-entropy alloy as hydrogen sensitive layer material, with hydrogen storage capacity and resistance response characteristics, can produce stable, repeatable resistance rise response to hydrogen at 90°C condition, realizes hydrogen sensitive function.

The invention relates to a hydrogen leakage dynamic monitoring and early warning method and system for a hydrogen production and hydrogenation all-in-one machine. The system comprises a measuring unit, a synchronous data acquisition module, an analog signal processing module, a central processing module, an alarm control module and a power supply module, the measuring unit comprises a hydrogen sensor, a temperature sensor, a pressure sensor, a flow sensor, an oxygen concentration sensor and a humidity sensor; the synchronous data acquisition module is connected with the measurement unit and is used for receiving original data of each sensor in real time and synchronously transmitting the original data; the central processing module is connected with the analog signal processing module, is internally provided with component transport equation analysis logic and is used for multi-parameter data fusion analysis and hydrogen escape risk identification; the alarm control module is connected with the central processing module and is used for triggering diversified early warning responses; and the power supply module adopts a 24V power supply, is internally provided with a power supply conversion sub-module and is used for providing stable power supply for each module.

The invention discloses a palladium alloy film hydrogen sensor and a hydrogen detection system and method.The sensor comprises a substrate, the substrate is provided with a first surface and a second surface which are opposite, the first surface is provided with a first hydrogen-sensitive film responding to the hydrogen concentration within a first detection range, and the second surface is provided with a second hydrogen-sensitive film responding to the hydrogen concentration within a second detection range; a second hydrogen-sensitive film which responds to the hydrogen concentration in a second detection range is arranged on the second surface, and the material components and / or microstructures of the first hydrogen-sensitive film and the second hydrogen-sensitive film are different; a temperature measuring element for measuring temperature and a heating element for heating are also arranged on the substrate; wherein the lower limit value of the first detection range is larger than the lower limit value of the second detection range and smaller than or equal to the upper limit value of the second detection range, and the upper limit value of the first detection range is larger than the upper limit value of the second detection range. According to the invention, the problems of complex design, large size, high power consumption, high cost and large error of an existing dual-sensing system are solved through integrated double-sided design of high and low measuring ranges and shared temperature compensation.

The invention discloses a small and compact fuel cell hybrid power system which comprises a solid hydrogen storage system, a fuel cell system, a cell module, a driving system, an SOC monitoring module and an electric pile temperature sensor, wherein the electric pile temperature sensor is used for detecting the temperature of the fuel cell system; the cooling module is used for cooling the fuel cell system; the hydrogen sensor is used for detecting the sealing performance of the solid hydrogen storage system; the pressure sensor is used for detecting the pressure of the solid hydrogen storage system; the main control system is used for controlling the fuel cell system to charge the lithium battery based on the charge state of the battery module transmitted by the SOC monitoring module; and the control module is used for controlling the cooling module to cool the fuel cell system on the basis of the temperature of the electric pile transmitted by the electric pile temperature sensor so as to ensure that the fuel cell system always works in the optimal temperature interval, and calculating the driving mileage of the vehicle according to the pressure of the solid hydrogen storage system transmitted by the pressure sensor.

Tin tetrachloride pentahydrate, zinc nitrate hexahydrate and dimethylimidazole are used as raw materials, methanol is used as a solvent, and the tin-zinc bimetallic oxide, which is named Sn-Zn-O for short, is obtained through stirring, centrifugal drying and calcining; the material is an n-type semiconductor, and the chemical composition of the material is SnO2 and ZnO. The microstructure of Sn-Zn-O is a nano microsphere, and the particle size range of the Sn-Zn-O is 100-250 nm. The invention relates to a preparation method of a hydrogen sensor based on Sn-Zn-O, namely when the Sn-Zn-O is used as the hydrogen sensor, the optimal working temperature is 180 DEG C, the response value is 112 when the hydrogen concentration is 1000 ppm, the response time is 1.29 s, and the recovery time is 147 s. When the hydrogen concentration range is 0.1-2000ppm, the hydrogen sensor has different responses to hydrogen with different concentrations, and the lowest hydrogen concentration is detected to be 0.1 ppm.

This hydrogen-powered electric vehicle comprises an electric powertrain for driving at least one drive wheel of the vehicle, at least one electrical energy storage battery, at least one fuel cell module, a hydrogen tank (15) for the fuel cell, and a hydrogen circuit (16) connected to the tank. The hydrogen circuit includes a high-pressure section (20) corresponding to the pressure of the tank, which includes components through which the hydrogen circulates. It comprises a non-hydrogen-tight housing (30) equipped with a hydrogen sensor (31) in which said components of the hydrogen circuit are placed. (See Figure 4 for abbreviations.)

The invention relates to the technical field of hydrogen leakage monitoring, and discloses a hydrogen leakage alarm which comprises a central controller, a control panel, an alarm system, a monitoring and recording unit, a linkage control unit, a maintenance and self-inspection unit, a sensor module and a communication module. The control panel is used for providing an operable interface for a user, the alarm system is used for giving an alarm, the monitoring and recording unit is used for monitoring the running state of the system in real time, and the linkage control unit is used for triggering other equipment or systems when hydrogen leakage is detected. By arranging the multiple hydrogen sensors, the hydrogen concentration of each point position is uniformly detected, the obtained monitoring data is more accurate, the device has more reference value for the subsequent overhaul treatment process, the structure is compact, and false alarm and missing alarm caused by the influence of other gases in the air when a single hydrogen sensor is used for detecting hydrogen are avoided.

The invention discloses a preparation process of a palladium nano-film hydrogen sensor, and belongs to the field of sensor preparation. The preparation process of the palladium nano-film hydrogen sensor comprises the following steps: step 1, pre-treating an aluminum sheet, and flattening to remove a surface oxide layer; 2, carrying out primary oxidation and secondary oxidation; thirdly, the aluminum oxide layer is subjected to chambering operation, and an aluminum-based negative mold is obtained; step 4, carrying out polymerization and demolding; 5, coating the PMMA nano-column array sample through electron beam evaporation equipment to form a palladium alloy nano-film; step 6, preparing and arranging a microelectrode; 7, completing electrical connection and packaging between the microelectrode and an external circuit; the response value and the response speed of the prepared palladium nano-film hydrogen sensor are remarkably improved, and the situation that the sensor is rapidly aged and breaks down due to embrittlement, cracking or stripping caused by substrate limitation and strong lattice stress is avoided.

The invention relates to a subway tunnel hydrogen energy vehicle high-pressure hydrogen leakage monitoring and hydrogen discharging method. The method comprises the steps that hydrogen sensors are arranged on a subway tunnel ceiling at preset intervals; the hydrogen concentration measured by each hydrogen sensor is obtained, and the hydrogen sensor with the hydrogen concentration larger than or equal to a first preset threshold value is marked as a target hydrogen sensor; determining a tunnel where the target hydrogen sensor is located, marking the tunnel as a leakage tunnel, and determining a tunnel type of the leakage tunnel; hydrogen storage pressure of a high-pressure hydrogen storage tank of the hydrogen energy vehicle is obtained, and corresponding ventilation information is obtained in a preset database according to the tunnel type and the hydrogen storage pressure; and based on the obtained ventilation information, the leakage tunnel is controlled to conduct ventilation in the obtained ventilation mode, and the ventilation wind speed is controlled to be the basic wind speed till the hydrogen concentration is reduced to be below a preset safety threshold value. Hydrogen is effectively prevented from being accumulated on the tunnel vault to form explosive mixed cloud, the explosion risk is greatly reduced, and operation safety of the underground space is guaranteed.

The invention provides a molybdenum disulfide-based hydrogen sensitive material and a preparation method thereof, and a flexible room-temperature hydrogen sensor and a preparation method and application thereof, and relates to the technical field of gas sensors. The molybdenum disulfide-based hydrogen sensitive material provided by the invention comprises a MoS2 two-dimensional nanosheet and Pd loaded on the MoS2 two-dimensional nanosheet. According to the invention, the MoS2 two-dimensional nanosheet has good conductivity at room temperature, and the loading of Pd can effectively enhance the hydrogen adsorption capacity and electron conduction efficiency of the MoS2 material; and due to the special scale effect of the two-dimensional nanosheet, the stress accumulation in the bending process of the flexible sensitive film can be effectively relieved, and the mechanical property of the flexible sensor is improved. The molybdenum disulfide-based hydrogen sensitive material is combined with a flexible substrate to construct a flexible hydrogen sensor based on Pd-MoS2, and the flexible hydrogen sensor shows excellent hydrogen sensitive characteristics at room temperature, namely high sensitivity, high selectivity and high stability.

A gas sampling device and method including a cylindrical chamber comprising a closed top and a closed bottom, an opening in the top and air vents in the wall of the chamber proximate to the closed bottom, a fan in the opening for drawing atmospheric air into the chamber and creating positive pressure in the chamber to expel air through the air vents, a set of sensors in the chamber, the sensors comprising a methane sensor, a hydrogen sensor, a liquified petroleum gas sensor, a temperature sensor, a pressure sensor, and a humidity sensor, and a controller and a power source operably connected to the sensors and the fan for controlling the fan and sensors for the collection of sensor data.

The utility model relates to the technical field of detection module, especially for the multimode detection module for vehicle lithium battery, including multispectral imager, two multispectral imager respectively are established in the top both sides of metal frame, the inside of metal frame is equipped with a plurality of battery group, the inside of battery group is equipped with a plurality of electric core, the top of electric core is pasted with fiber bragg grating sensor, the top of battery group is equipped with three NTC film thermocouple. The support rod in the device is obliquely installed on both sides of the metal frame, which can optimize the viewing angle of the two multispectral imagers, so that the battery group can be fully covered to eliminate dead angles. The hydrogen sensor is embedded in the contact side of the battery group, which can capture combustible gas leakage in real time to speed up the early warning. The design of the protective shell can provide physical protection for the electric core and ensure the surface of the NTC film thermocouple to measure temperature. The three NTC film thermocouples are distributed on the top front, middle and back of the protective shell, which can monitor the temperature gradient and accurately locate the overheating.

The application belongs to the field of gas sensing, and relates to a hydrogen sensor, and particularly provides an elastomer tensile type hydrogen sensor and a preparation method thereof, so as to solve the problems of limited detection range, mutual restriction between detection range and process complexity, and stability to be improved of the existing Pd-based nanogap type hydrogen sensor. The application comprises: a flexible substrate, a Pd-based hydrogen sensitive film arranged on the front and back surfaces of the flexible substrate, and a PEI-rGO multilayer composite strain sensitive film, the flexible substrate is used as a signal conversion medium between the hydrogen sensitive film and the strain sensitive film on the front and back surfaces of the flexible substrate, the lattice expansion strain of the hydrogen sensitive film after absorbing hydrogen is converted into an electrical signal output of the strain sensitive film, and environmental hydrogen concentration detection is realized. The hydrogen sensor can work continuously in a wide expansion range of the hydrogen sensitive film without relying on the switching of the nanogap, the wide detection range and the low process complexity can be considered, and the stability of the device is significantly improved.