439 results about "Hydrogen sensor" patented technology

The invention provides a flexible palladium film hydrogen sensor and a preparation method thereof, the flexible palladium film hydrogen sensor is sequentially provided with a flexible substrate, a hydrogen sensitive sensing layer and a contact connection layer from bottom to top, and the contact connection layer is connected with a resistance measurement unit; and the hydrogen-sensitive sensing layer is a palladium or palladium alloy film with a conical micro-nano structure. The palladium or palladium alloy thin film with the conical micro-nano structure provides a hydrogen sensor conical surface micro-nano structure with a high specific surface area for the flexible palladium thin film hydrogen sensor, and the process that hydrogen is adsorbed, dissolved and diffused into the palladium or palladium alloy thin film is accelerated, so that the response speed of the sensor is increased; according to the hydrogen sensor, the flexible substrate is adopted, so that the hydrogen sensor can be conveniently arranged in various narrow spaces, and the applicability of the hydrogen sensor in various scenes is improved.

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 discloses a fire extinguishing system and method for accurate positioning of thermal runaway of a container type energy storage power station. The fire extinguishing system is composed of an energy storage power station, battery packs distributed in an array mode and a fire extinguishing system body. Each battery pack is provided with a ventilation safety valve and a fire extinguishing device, a hydrogen sensor array covering the whole area is arranged on the plane of the energy storage power station, the ventilation safety valves guide out hydrogen generated in the initial stage of thermal runaway, and the sensor array monitors the concentration of the whole area in real time. The industrial personal computer receives sensor data, constructs a gas concentration distribution diagram by combining pre-stored battery pack space distribution information, and displays a thermal runaway area on the display screen in real time. The positioning program analyzes a hydrogen concentration field based on gas diffusion characteristics, and after the position of a fault battery pack is accurately recognized, the industrial personal computer immediately triggers the fire extinguishing device in the corresponding pack to implement fixed-point fire extinguishing, so that an early fire extinguishing closed loop is formed. According to the system, through multi-sensor data fusion and gas distribution mapping technologies, rapid positioning and accurate suppression of a thermal runaway source are achieved, and the safety protection level of an energy storage power station is effectively improved.

The invention discloses a lithium precipitation rapid quantitative detection method and system, a storage medium and a program product, and relates to the field of equipment specially suitable for material research and analys.The method comprises the steps that after ethyl alcohol of a preset volume is dropwise added to the surface of a to-be-detected pole piece, real-time concentration data of hydrogen is collected; determining a time-varying curve of the hydrogen concentration; determining the reaction activity of metal lithium on the surface of the to-be-detected pole piece based on the curve; compensating and correcting the real-time concentration data of the hydrogen according to the reaction activity; and converting the corrected hydrogen concentration data into a lithium quality detection result. The hydrogen generation container is the closed reaction bottle, the needle connected with the hydrogen sensor is inserted into the reaction bottle, the hydrogen concentration can be rapidly detected, the hydrogen concentration in different reaction bottles can be rapidly detected by inserting different reaction bottles, and the detection process is in a closed environment. The method is used for improving the precision of quantitative detection of precipitated lithium, so that the frequency of electrode replacement and calibration is reduced, and the continuity and reliability of detection data in the production process are improved.

The invention provides a hydrogen sensor with an ultrafast hydrogen response speed and a preparation method thereof, the hydrogen sensor comprises a silicon oxide substrate and a double-interdigital electrode structure, the double-interdigital electrode structure comprises a titanium electrode layer, a tungsten enhancement layer and a palladium sensitive layer; an interdigital electrode pattern is arranged on the silicon oxide substrate, the titanium electrode layer covers the interdigital electrode pattern, the tungsten enhancement layer covers a pin area and a bridge arm resistance area of a titanium electrode, the palladium sensitive layer covers the titanium electrode layer and corresponds to the position of the interdigital electrode pattern, and the titanium electrode layer is directly arranged on the silicon oxide substrate. The structure is simple, the titanium electrode serves as the bottom electrode, the sensitivity and mechanical stability of the sensor are improved, the tungsten enhancement layers are arranged in the titanium electrode pin area and the bridge arm resistor area, and the overall conductivity and mechanical strength are 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 provides a metal film hydrogen sensor and a preparation method thereof. The sensor comprises a substrate structure, a measuring electrode and a hydrogen sensitive laminated structure which are sequentially arranged from bottom to top, the hydrogen sensitive laminated structure can be combined with hydrogen to change the resistance value of the hydrogen sensitive laminated structure, the hydrogen sensitive laminated structure at least comprises a hydrogen storage layer and a hydrogen adsorption diffusion layer, the hydrogen adsorption diffusion layer is arranged above the hydrogen storage layer, and the hydrogen adsorption diffusion layer is used for adsorbing the hydrogen and enabling the hydrogen to be diffused in the hydrogen adsorption diffusion layer; the measuring electrode is electrically connected with the hydrogen sensitive laminated structure. Compared with a traditional palladium alloy film, the hydrogen storage layer can remarkably improve the hydrogen storage capacity of the sensor, so that the resistance type hydrogen sensor has a wider dynamic response range, through structural design, three functions of the sensing unit are achieved through the two metal film layers respectively, and the application range of the resistance type hydrogen sensor is widened. Therefore, each layer of metal film is optimized, and the overall performance of the hydrogen sensor is improved.

A method is disclosed for managing and safeguarding a battery environment. The method includes continuous monitoring of individual battery voltages in a battery room and automatic isolation of defective batteries, employing a controller-solenoid switch mechanism responsive to voltage abnormalities. The methodology accounts for the state of battery charging, invoking fan activation when charging occurs or hydrogen levels rise. Also disclosed is a system for managing a battery system in a battery room and isolating defective batteries. Enhanced system features include hydrogen sensors strategically placed throughout, including the ceiling, with outcome-driven fan operation and comprehensive notification mechanisms to inform on-site personnel of gas release locations, maintaining a secure and efficient battery room environment.

The invention discloses a hydrogen sensor calibration and calibration model training method and device, and belongs to the field of hydrogen concentration detection.The method comprises the steps that a plurality of electric signal data output by a hydrogen sensor and first hydrogen concentration data of the space where the hydrogen sensor is located when the hydrogen sensor outputs the electric signal data are collected; extracting feature data in the electric signal data; predicting corrected second hydrogen concentration data corresponding to the electric signal data according to the feature data; predicting a plurality of interference signals corresponding to the electric signal data according to the feature data; wherein each interference signal corresponds to one interference factor; according to the first hydrogen concentration data and the second hydrogen concentration data, prediction error loss is obtained, confrontation loss is obtained according to the interference signals, and finally parameters of the hydrogen sensor calibration model are optimized in combination with a preset weight parameter combination. Therefore, by implementing the application, the problem of low detection precision of the hydrogen sensor under a plurality of interference factors can be solved.

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 relates to the technical field of hydrogen detection, in particular to a hydrogen detection and measured value correction method based on a hydrogen sensor, and the method comprises the following steps: analyzing the change trend of voltage data in an active unit at each moment and in a preset duration before the moment, and the correlation of the voltage data between the active unit and a reference unit; determining hydrogen purity responsivity; the hydrogen compensation confidence coefficient is determined by analyzing the change trend of the hydrogen purity responsivity at each moment and all moments in a previous preset time period and the average distribution and dispersion degree of the hydrogen purity responsivity, so that the hydrogen concentration at each moment is corrected. According to the invention, the influence of cross interference of other combustible gases except hydrogen and baseline drift of the hydrogen sensor on hydrogen detection and concentration measurement is solved, and the long-term stability of hydrogen concentration monitoring and the accuracy and reliability of a measurement result are improved.

The invention discloses an energy storage power station explosion venting plate with an integrated active ignition device, the energy storage power station explosion venting plate comprises an energy storage power station box body and the integrated ignition device, the exterior of the integrated ignition device is provided with thermal insulation cotton, the center of the thermal insulation cotton is provided with a square groove, and the integrated ignition device is embedded in the square groove of the thermal insulation cotton. The heat preservation cotton is sleeved with a heat preservation cotton cover, and an opening matched with the integrated ignition device in shape is formed in the center of the bottom of the heat preservation cotton cover. The integrated ignition device has the advantage of being compact in structure, the controller, the hydrogen sensor and the standby battery are integrated into the integrated ignition device and installed in the explosion venting plate, extra space of the energy storage power station is not occupied, and therefore the installation space of the explosion venting plate of the energy storage power station is reduced; when the integrated ignition device breaks down and cannot be actively started to release pressure, the explosion venting plate still has the passive explosion venting function.

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 relates to the technical field of gas sensors, in particular to a sensing material based on nanoparticle loading, a preparation method of the sensing material and a gas sensor, and the sensing material comprises a substrate material and transition metal nanoparticles and / or precious metal alloy nanoparticles loaded on the surface of the substrate material; the substrate material comprises one or more of defect oxide, MOF, sulfide, carbide, MXene and phosphide. The semiconductor characteristic of the substrate material is combined with the hydrogen dissociation capability of the transition metal nanoparticles and / or the noble metal alloy nanoparticles, so that the adsorption and dissociation efficiency of hydrogen can be improved; by loading the nanoparticles on the substrate material, the interface hydrogen overflow process is regulated and controlled, the energy barrier of hydrogen overflow is reduced, and the sensitivity and response speed of the hydrogen sensor are further improved. By optimizing the interface structure between the nanoparticles and the substrate material, the process of interface hydrogen overflow is improved, and the hydrogen sensing performance is improved.

The utility model discloses a hydrogen leakage detection system. The problem that safe, stable and economical operation of the hydrogen refueling station is affected due to the fact that hydrogen leakage cannot be comprehensively detected in time in an existing hydrogen refueling station is solved. The system comprises diffusion pipelines correspondingly connected between a diffusion tower and hydrogen adding / discharging equipment, hydrogen sensors and one-way valves which are respectively connected in the diffusion pipelines, hydrogen detectors which are respectively used for detecting the hydrogen concentration at the hydrogen adding / discharging equipment, and combustible gas alarm controllers which are correspondingly in communication connection with the hydrogen detectors, the PLC is in corresponding communication connection with the combustible gas alarm controller and the hydrogen sensor, the audible and visual alarm is electrically connected with the PLC, and the emergency cut-off valve is used for controlling on and off of a hydrogen channel of the hydrogen adding / discharging equipment and is electrically connected with the PLC. The system can timely and effectively monitor hydrogen leakage at each device and the diffusion pipeline in the hydrogen refueling station, and is safe and efficient.

This invention proposes a tapered fiber optic hydrogen sensor and its fabrication method, belonging to the field of hydrogen sensors. The sensor includes a tapered section in the middle of an optical fiber; a sensing element tightly fitted around the tapered section; a light source inputting an optical signal into the optical fiber; a spectrometer measuring the position of characteristic peaks in the optical fiber's spectrum; and a three-layer thin-film structure comprising the sensing element from the inside out: an excitation layer that excites the optical fiber surface to generate a plasmon resonance effect; a reaction layer made of a gas-sensitive material that reacts with hydrogen; and a catalytic layer that catalyzes the reaction between the gas-sensitive material and hydrogen. This invention employs a tapering method to fabricate the fiber optic sensor, significantly improving its sensitivity. Using tungsten oxide and gold co-sputtering material as the gas-sensitive material greatly improves the response and recovery times compared to using only tungsten oxide.

The utility model relates to a waterproof and breathable hydrogen sensor device, which comprises a shell, a waterproof and breathable film for water resistance and breathability, an air pressure buffer cover for gas shunting, a PCB (printed circuit board) loaded with a hydrogen chip and a bottom cover. According to the hydrogen sensor device, the thin waterproof breathable film is adhered to the inner wall of the air inlet grille of the shell, so that ventilation can be kept, water molecules can be prevented from entering the cavity in the shell, and the waterproof and breathable functions of the hydrogen sensor device are realized. And the waterproof breathable film on the inner wall of the air inlet grille is pressed and attached through the air pressure buffer cover, so that the situation that water molecules enter the inner cavity of the shell due to untight attachment of the waterproof breathable film and the inner wall of the air inlet grille is avoided, and the situation that the waterproof breathable film falls off due to impact of high-pressure air is avoided. And the air pressure buffer cover can be used for carrying out shunting treatment on the high-speed flowing gas, so that the flow speed of the high-speed flowing gas is reduced, the high-speed flowing gas is slightly diffused into the inner cavity of the shell, and the interference on the hydrogen chip is reduced.

The invention relates to the field of hydrogen sensors, in particular to a palladium-based multilayer film hydrogen sensor based on an abnormal Hall effect as well as a preparation method and application of the palladium-based multilayer film hydrogen sensor. The palladium-based multilayer film hydrogen sensor based on the abnormal Hall effect comprises a substrate, a film structure with a Hall rod pattern and an electrode layer which are sequentially arranged from bottom to top, the thin film structure with the Hall rod pattern sequentially comprises a Pd single-layer thin film and a (Co / Pd) X multi-layer thin film from bottom to top, wherein X represents the cycle number of the (Co / Pd) X multi-layer thin film; x is an integer from 1 to 10; in each period of the (Co / Pd) X multilayer film, an arrangement mode that the Co layer is arranged on the lower portion and the Pd layer is arranged on the upper portion is adopted. The palladium-based multilayer film hydrogen sensor based on the abnormal Hall effect has the advantages of being obvious in hydrogen detection current signal, high in environmental gas interference resistance and controllable in hydrogen detection concentration.

The invention discloses a high-purity hydrogen production safety monitoring method based on an intelligent sensing technology, and the method comprises the following steps: obtaining a plurality of hydrogen concentration data and environment data based on a detector disposed in a high-purity hydrogen production area; obtaining interference gas components and concentration in the high-purity hydrogen production area, and determining a plurality of interference factors based on interference degrees of the interference gas components and concentration on the plurality of hydrogen sensors; determining a plurality of environmental compensation factors based on the influence degree of the environmental data on the plurality of hydrogen sensors; fusing the plurality of hydrogen concentration data based on the plurality of interference factors and the plurality of environment compensation factors to obtain a target hydrogen concentration value; if the target hydrogen concentration value exceeds the early warning threshold value, an early warning signal and an early warning instruction are sent to a control terminal. According to the invention, the error of a single sensor is reduced, the influence of environmental data on the hydrogen concentration can be considered and corrected, and the accuracy of hydrogen concentration detection is improved.

The invention provides an oil-filled sleeve monitoring sensor. The oil-filled sleeve monitoring sensor comprises an aluminum alloy shell, a Teflon hollowed-out shell and a stainless steel shell arranged between the aluminum alloy shell and the Teflon hollowed-out shell. A pressure sensor, a hydrogen sensor, a UHF (Ultra High Frequency) sensor and a PCB (Printed Circuit Board) are arranged in the Teflon hollow shell; and the PCB is respectively connected with the pressure sensor, the hydrogen sensor and the UHF sensor. The sensors mounted on the circuit board are integrated together in a welding manner, so that the use space of the sensors is reduced, the sensors are more miniaturized and integrated, the future maintenance is greatly facilitated, and meanwhile, the shell for protecting the circuit board for mounting the sensors adopts a Teflon hollow structure, so that the sensor is corrosion-resistant, high-temperature-resistant and high-temperature-resistant, and the service life of the sensor is prolonged. And electromagnetic shielding of a metal material to the electromagnetic wave sensor can be avoided.

The invention belongs to the technical field of sensors, and relates to a low-power-consumption thin-film resistance type hydrogen sensor and a preparation method thereof. The hydrogen sensor comprises a nano array hydrogen sensor, a resistor and a storage capacitor, the branch where the nano array hydrogen sensor is located is connected in parallel with the branch where the storage capacitor is located; a branch where the nano array hydrogen sensor is located is provided with a resistor in series; and a branch where the nano array hydrogen sensor is located and a branch where the storage capacitor is located are powered by a power supply. When the nano-array hydrogen sensor is excited by hydrogen, the nano-array hydrogen sensor is subjected to electrochemical reaction to become a conductor, and a storage capacitor is used as a power supply, so that low-power-consumption work of the nano-array hydrogen sensor is realized; by controlling the working voltage within the set range, it can be ensured that the capacitor can rapidly reach a stable state in each charging and discharging process, so that the response speed and efficiency of the whole circuit are improved, and the resistance value obtained through bridge measurement is more accurate and stable.

The invention discloses a flow compensation method and device for a palladium alloy film hydrogen sensor and a transmitter. The method comprises the steps that the response time tau, the actually-measured resistance change value delta Rmeas and the concentration measurement value Cmeas of the palladium alloy film hydrogen sensor for currently detecting to-be-detected gas are obtained; determining a current flow estimated value Qest of the to-be-detected gas according to the tau in combination with a pre-established flow-response time relation model; determining the ratio k of the delta Rmeas to the theoretical resistance change value delta Rturn corresponding to the concentration true value Cturn of the gas to be detected according to the Qest in combination with a pre-established flow-resistance change ratio relation model; and correcting the Cmeas according to the k, so as to obtain the Cturn. Therefore, the influence of the flow change of the to-be-measured gas on the concentration measurement value of the palladium alloy hydrogen sensor can be corrected based on the response time.

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 high-stability MEMS hydrogen sensor and a preparation method thereof. The high-stability MEMS hydrogen sensor is a semiconductor resistance type hydrogen sensor based on a metal oxide gas sensitive coating and sequentially comprises a silicon nitride supporting layer, a Pt / Ti heating electrode, a sensing electrode, a silicon nitride isolating layer and a metal oxide gas sensitive film from bottom to top. The metal oxides are high-purity antimony doped tin dioxide, tetraamino palladium nitrate and tetraammineplatinum nitrate. The preparation method comprises the following steps: mixing high-purity antimony-doped tin dioxide powder, tetraamino palladium nitrate powder and tetraammineplatinum nitrate powder, preparing gas-sensitive slurry from a mixed solution of terpilenol, diethylene glycol butyl ether acetate, ethyl cellulose, dibutyl phthalate and dioctyl phthalate, dispensing the gas-sensitive slurry on a central interdigital electrode area of an MEMS chip, and performing vacuum drying to obtain the gas-sensitive MEMS chip. And performing vacuum standing and slow heating to obtain the sensor. The sensor is low in detection lower limit and stable in resolution ratio after high-humidity aging.

The invention is applicable to the technical field of robots, and provides a clustered pipeline defect detecting and repairing robot which comprises a rack, the rack is provided with a walking mechanism used for moving in a pipeline, a connecting structure used for carrying out cluster connection on a plurality of machines and a repairing mechanism used for repairing a damaged part of the pipeline, and the rack is provided with a single chip microcomputer. The walking mechanisms, the connecting structures and the repairing mechanisms are all controlled by a single-chip microcomputer, the walking mechanisms are distributed along the circumference of the rack and symmetrically installed on the rack, and the connecting structures are symmetrically installed at the two ends of the rack. The point type laser hydrogen sulfide sensor is arranged below the camera; the triaxial angular velocity and high-precision positioning sensor is positioned on the lower top surface of the body bin; the lithium ion battery is fixed on the inner wall of the body bin and supplies power to the device; and a laser radar is mounted on the tail side to assist in performing recess detection in the pipeline.

A system including an engine capable of operating with fuel containing hydrogen, the system being provided with: a crankcase of the engine; an engine intake passage that sucks air into the engine; a crankcase intake passage that branches off from the engine intake passage and introduces air into the crankcase; a dilution air valve that is disposed in the crankcase intake passage and that opens and closes the crankcase intake passage; a compressor disposed upstream of a branch portion branching from the engine intake passage to the crankcase intake passage; a hydrogen sensor that detects a hydrogen concentration inside the crankcase; a crankcase exhaust passage that exhausts air inside the crankcase; and a control device that controls the opening and closing of the dilution air valve on the basis of the hydrogen concentration detected by the hydrogen sensor.

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 thermal conductivity type hydrogen sensor error compensation method based on dynamic collaborative optimization, and the method comprises the steps: taking the output voltage and temperature and humidity parameters of a conditioning circuit of a thermal conductivity type hydrogen sensor as the input, taking the hydrogen concentration as the output, constructing a neural network model based on error back propagation, and providing a dual-stage collaborative optimization strategy. Through deep exploration of a global-local dual-mode collaborative optimization mechanism and fast response capability complementation, the problem of temperature and humidity nonlinear compensation in a hydrogen complex environment is effectively solved, the method has the characteristics of high convergence speed, good network performance and the like, the purpose of accurate detection can be achieved, and the method is suitable for large-scale popularization and application. And an innovative solution is provided for environmental disturbance suppression and self-adaptive performance improvement of the gas detection equipment.