915 results about "Gaseous detection device" patented technology

The invention discloses a light-induced thermoelastic spectrum trace gas detection device and method based on an echo wall mode microcavity. The device comprises a first signal generator, a lock-in amplifier, a laser device control unit, a first laser device, a laser beam collimation unit, a gas chamber, a focusing lens, a tuning fork, an echo wall mode microcavity, a coupling medium, a second laser device, a second signal generator, a photoelectric detector and a computer, the emergent laser is focused to the interdigital root of the tuning fork through the focusing lens; laser output by the second laser device is transmitted by the coupling medium and coupled into the echo wall mode microcavity in an evanescent wave form, the echo wall mode microcavity deforms, the resonant wavelength of the echo wall mode microcavity in the transmitted spectrum moves, and the concentration of the gas to be detected in the gas chamber is inverted according to the displacement of the resonant wavelength. The problems that a quartz tuning fork is large in thermal noise and weak current signals are easily interfered by an electromagnetic field are solved.

The invention relates to the technical field of dehumidification heat pumps, and particularly discloses a dehumidification heat pump unit with a chlorine and carbon dioxide detection function, which comprises a case, and an air inlet device, a fresh air device, an exhaust device, a heat exchange device and an air supply device which are arranged in the case, and further comprises a PLC (Programmable Logic Controller) control system and an integrated gas detection device electrically matched with the PLC control system; the integrated gas detection device is used in cooperation with the air inlet device and the heat exchange device, the integrated gas detection device comprises a chlorine gas detection module and a carbon dioxide detection module, and the heat exchange device comprises a compressor, an evaporator and a condenser; the PLC control system is electrically connected with the integrated gas detection device, the compressor, the fresh air device and the exhaust device and used for receiving chlorine and carbon dioxide concentration signals detected by the chlorine detection module and the carbon dioxide detection module. The fresh air device is regulated to increase the fresh air introduction amount and start the exhaust device to accelerate exhaust of waste gas in the swimming pool.

The invention relates to cable pyrolysis test equipment in the technical field of cable pyrolysis. The cable pyrolysis test equipment comprises a contact gas detection device, a non-contact gas detection device, a cooler, a gas collection bottle, a gas collection sleeve and a high-pressure bottle, the gas collection bottle comprises a bottle body part and two bottle neck parts, the bottle body part is made of a transparent heat-resistant material capable of expanding along with internal pressure, outer ports of the two bottle neck parts are respectively provided with a gas inlet and a gas outlet, and the non-contact gas detection device performs gas detection corresponding to the bottle body part; the gas collection sleeve comprises a heat transfer sleeve section, two heat insulation sleeve sections and two transition sleeve sections, the outer end walls of the two transition sleeve sections are sleeved with sealing hoops in a clamped mode, the end walls of the two transition sleeve sections are provided with a gas inlet pipe and a gas outlet pipe respectively, the gas inlet pipe is correspondingly communicated with a bottle opening of the high-pressure bottle, and the gas outlet pipe is correspondingly communicated with a gas inlet of the gas collection bottle; gas discharged from an exhaust port of the gas collecting bottle enters a cooler to be cooled and then is guided into a contact type gas detection device; according to the test equipment, characteristic gas can be more completely collected, and the detection diversity and accuracy are improved.

The invention belongs to the technical field of gas detection, and particularly relates to a multi-component gas detection device and a detection method.The multi-component gas detection device is characterized in that according to components of detected gas, a laser driver drives a laser array to emit light with different modulation frequencies and multiple wavelengths, the light is changed into parallel light after passing through an optical fiber array and a micro-lens array, and the parallel light is transmitted to a gas detector; after gas to be detected is absorbed and reflected by a diffuse reflection surface, reflected light passes through a lens and a dichroscope to be converged, light with long wavelength and light with short wavelength respectively enter photoelectric detectors with corresponding wave bands, the photoelectric detectors convert optical signals into electric signals and filter the electric signals, and the filtered signals to be detected are transmitted into a digital lock-in amplifier to be processed in parallel. And demodulating second harmonics and first harmonics of different gases, and calculating the concentration of each to-be-detected gas through a calculation unit. According to the invention, simultaneous detection of multi-component gas concentration can be realized.

The utility model discloses an extraction type gas detection device. The extraction type gas detection device comprises a detection box, a gas detector, a gas extraction pump, a filtering device, a compressed air supply device, a calibration device and a control device, according to the utility model, the motor rotates to drive the turntable to rotate, the turntable shifts the indexing plate through the shifting rod and the indexing groove, and the indexing plate rotates each time to enable the first air inlet hole in the lower wall of the rotating cylinder to be communicated with the eight groups of exhaust pipes in sequence, so that the aim of switching the eight groups of exhaust pipes for air intake is fulfilled; the gas detector is used for detecting the concentration of gas entering the detection box, the motor continuously rotates to keep the device continuously running for 24 hours, and the on-site gas concentration is monitored in real time.

The invention provides a gas detection device based on barrier modulation. The gas detection device comprises a substrate; the detection assembly is arranged on the substrate, and the detection assembly comprises a sensor which comprises a base arranged on the heating module; the two electrodes are arranged on the substrate at intervals; the sensitive layer is arranged on the substrate and located between the two electrodes, and a Schottky barrier is formed between the two electrodes and the sensitive layer; the heating module is suitable for heating the sensitive layer; when the power supply module works in a first operation mode, sensitive gas in the volatile organic compound is enriched on the sensitive layer in a physical adsorption mode, when the power supply module works in a second operation mode, the height of the Schottky barrier is reduced, and the heating module heats the sensitive layer to a target temperature. Enabling the sensitive gas to be subjected to oxidation-reduction reaction on the sensitive layer to generate electrons and generate a detection signal; and the signal processing assembly is arranged on the substrate and is suitable for receiving the detection signal and obtaining the concentration of the sensitive gas according to the detection signal.

The invention relates to the technical field of microenvironment gas monitoring, in particular to a gas monitoring and early warning method for cultural relics in a corrosive microenvironment, which comprises the following steps: arranging a gas detection device in a cultural relic preservation area, the method comprises the following steps: covering a space in which a cultural relic is located to obtain gas related data in the space, and setting a data interval conforming to a storage standard on the basis; and the data transmission module is used for transmitting the screened gas related data acquired by the gas detection device to the data processing and analyzing unit. In the invention, through the four steps of arranging the gas detection device, transmitting data, analyzing and processing the data and starting the early warning module, the problem that the traditional cultural relic gas monitoring method mostly adopts a simple sensor to be combined with manual regular data checking is solved; as the gas concentration change cannot be comprehensively mastered in real time and an intelligent analysis, judgment and early warning mechanism is lacked, the corrosion risk of the cultural relics is difficult to control.

A gas detection device for detection of one or more gas analytes in an environment includes a housing including an inlet via which gas to be sampled from the environment enters the housing, a control system within the housing comprising a processor system and a memory system in communicative connection with the processor system, and one or more gas sensors within the housing in fluid connection with the inlet and in communicative connection with the control system. Each of the one or more gas sensors is independently responsive to one of the one or more gas analytes. The control system is configured to control flow rate of gas from the environment through an accessory device assembly including one or more accessory devices in fluid connection with the inlet on the basis of data for the accessory device assembly in fluid connection with the inlet.

The utility model relates to a high-voltage cable buffer layer ablation characteristic gas detection device which comprises a gas acquisition unit, a gas detection unit, a data processing unit and an alarm unit, the gas collection unit comprises a circulating pump, a vacuum pump, a sampling gas cylinder, a pressure sensor and a plurality of valves, the gas detection unit comprises two detection modules, the gas inlet pipe is connected with a first electromagnetic valve, then is connected with the sampling gas cylinder and is connected with the circulating pump through a second electromagnetic valve, and the circulating pump is connected with the two detection modules through an electromagnetic three-way switching valve. An outlet of the sampling gas cylinder is connected with a third electromagnetic valve, then connected with an inlet of a vacuum pump, connected with a fourth electromagnetic valve and then connected with two detection modules at the same time; the first detection module is composed of a gas concentration sensor, a temperature sensor and a humidity sensor, and the second detection module is a gas sensor array. The device can perform field detection on gas generated in the ablation process of the buffer layer of the high-voltage cable, so that potential faults of the cable can be found and early warned in time.

The present invention relates to the field of ring network box technology, and discloses an intelligent primary and secondary fusion ring network box, comprising an outer box and multiple inner boxes arranged in the outer box, the outer box's top cover, box side walls, box bottom tray and box back wall are all hollow structures, multiple exhaust fans are arranged on the inner plate of the box top cover, each exhaust fan is located above the corresponding inner box top air outlet, the cavity in the box top cover is divided into multiple separate upper ventilation cavities by multiple upper partition plates, each exhaust fan is connected upward to a different ventilation cavity, the cavity in the box back wall is divided into multiple separate rear ventilation cavities by a rear partition plate, the rear ventilation cavity in each box back wall is connected to the corresponding upper ventilation cavity in the box top cover to form a separate ventilation cavity, and a gas detection device is respectively arranged in each ventilation cavity. It has a block-type ventilation and heat dissipation system and a block-type detection system, has good waterproof, moisture-proof, anti-collision and anti-leakage effects, and optimizes the wiring layout.

The utility model relates to the technical field of gas detection devices, and discloses a gas detection device for environment detection, which comprises a handheld gas detection device, the outer side of the handheld gas detection device is provided with a gas detection head, and the outer side of the handheld gas detection device is provided with an operation button; the device is provided with a stable protection device, so that the purpose of ensuring the stability of a shielding structure of a transparent protection cover on a display screen on the outer side of the handheld gas detection device is achieved, the situation that the display screen of the handheld gas detection device is scratched and abraded is avoided, the service life of equipment is prolonged, and gas detection is facilitated; the device is provided with a positioning device, a reset spring in a mounting shell provides elastic force to push a metal moving pad, and a positioning rod is movably inserted into a corresponding sliding block to complete locking, so that the purpose that the metal moving pad is simply and conveniently locked after moving is achieved, and it is ensured that a sliding plate is stable and does not loosen after being moved.

The invention discloses an MEMS (Micro Electro Mechanical System) chip, a preparation method of the MEMS chip, a micro electro mechanical system gas sensor and a gas detection device. The MEMS chip comprises a first pole plate and a second pole plate, a cavity is formed between the first pole plate and the second pole plate, a dielectric substance in the cavity is gas, the first pole plate is provided with a first vent hole, the cavity is communicated with the outside through the first vent hole, and the second pole plate is provided with a second vent hole. The mechanical resonant frequency of the first polar plate is far greater than the frequency of sending voltage excitation to the MEMS chip by an ASIC (Application Specific Integrated Circuit) chip, or both the mechanical resonant frequency of the first polar plate and the frequency of sending voltage excitation to the MEMS chip by the ASIC chip are 60 kHz to 100 kHz; the first pole plate and the second pole plate form a variable capacitor, and the dielectric substance of the variable capacitor is gas, so that the sensitivity of the MEMS gas sensor using the MEMS chip can be improved.

The invention relates to the technical field of photoacoustic spectrometry, in particular to a gas detection device and method based on a 3D printing Helmholtz photoacoustic cell, and is suitable for the fields with load requirements such as unmanned aerial vehicle-mounted gas monitoring platforms. In order to overcome the problems of large volume, heavy weight, complex structure and low integration level of a photoacoustic gas sensor in the prior art, the lightweight Helmholtz photoacoustic cell structure manufactured based on 3D printing comprises a sound wave generation cavity, a small-diameter connecting pipe and a detection cavity which are integrally formed, an optical reflection unit is integrated in the sound wave generation cavity, and the optical reflection unit is integrated in the detection cavity. Two concave reflectors are arranged to reflect incident light beams for 160 times, a laser, an optical fiber collimator, a pre-amplifier, a lock-in amplification circuit board, a notebook computer and a current temperature control module are arranged outside, and the concentration of gas to be detected is obtained through analysis and processing of the notebook computer.

The invention relates to the technical field of optical fiber detection, and particularly provides a detection system and a detection method for a hollow-core optical fiber, and a related product. The detection system for the hollow-core optical fiber comprises a gas storage device which is communicated with a first end of a to-be-detected hollow-core optical fiber and is used for storing gas which is conveyed into an anti-resonant cavity of the to-be-detected hollow-core optical fiber and has constant gas pressure; and the gas detection device is communicated with the second end of the to-be-detected hollow-core optical fiber and is used for detecting gas output by the anti-resonant cavity of the to-be-detected hollow-core optical fiber to obtain a detection result. According to the method, the quality of the hollow-core optical fiber can be effectively detected, the reliability of the hollow-core optical fiber put into use is ensured, and unnecessary waste of hollow-core optical fiber resources is avoided.

The invention discloses a harmful gas detection device. The harmful gas detection device comprises a handheld mechanism, a detection mechanism arranged on the handheld mechanism and an external connection mechanism arranged on the detection mechanism, the detection mechanism comprises a connecting cylinder arranged on the handheld mechanism, a detector body arranged in the connecting cylinder and abutting assemblies arranged at the two ends of the connecting cylinder. The external connection mechanism comprises a wheel body and an external connection sleeve which are arranged on the connecting cylinder, and a rotating assembly arranged on the external connection sleeve. The detection mechanism can be placed at a front position of a worker through the arrangement of the handheld mechanism; the arrangement of the detection mechanism can guide air at different positions on a forward road into the detector main body in the moving process, so that the detection effect is improved, the arrangement of the wheel bodies can effectively improve more loading capacity, the increase of the loading capacity can better improve the storage amount of batteries of the device, and the detection efficiency is improved. And the operation time of the device is prolonged.

The gas detection device comprises a shell, a detection assembly, a blocking part and a shell part, and the blocking part and the shell part are both located in the shell; the shell is provided with a first communicating hole, the blocking part is provided with a diffusion cavity, the first communicating hole is communicated with external gas of the gas detection device, and the first communicating hole is communicated with gas of the diffusion cavity; the shell part is provided with a second communication hole and a detection cavity, the detection assembly is at least partially located in the detection cavity, and the second communication hole is communicated with the detection cavity; the diffusion cavity is provided with an air inlet and a bottom opening; in the height direction of the gas detection device, the gas inlet is closer to the first communication hole relative to the bottom opening, the flow area of the gas inlet is larger than that of the bottom opening, and at least part of the second communication hole is located in the bottom opening. The response speed of the gas detection device can be increased.

The utility model discloses a human body exhaled VOC gas detection device relates to VOC gas detection technical field, including gas detector and detection probe, the detection probe is provided the top end of gas detector, the top end of gas detector is provided with the protection subassembly outside the detection probe, and the protection subassembly is provided with the detection probe. The protection assembly comprises a transparent box and a plastic joint, and the transparent box and the plastic joint are welded with each other; the detection probe disclosed by the utility model can be in full contact with gas in the transparent box for detection, so that the gas in the transparent box is prevented from being influenced by the gas outside the transparent box, the transparent box does not need to be held for a long time, and keys of the gas detector are convenient to operate; when the detection probe pushes the limiting sleeve to move, external gas entering the sliding plate can be reduced, the gas concentration in the transparent box can be increased, and VOC trace gas in the transparent box can be detected more easily.

The invention provides an anti-explosion valve, a gas detection device, an energy storage system, an energy storage power station and a control method, and relates to the technical field of energy storage safety. The explosion-proof valve comprises an explosion-proof valve shell used for packaging an explosion-proof valve assembly, a pressure color-changing sensor and a pressure transmitter; the anti-explosion valve assembly comprises an anti-explosion valve top cover and an anti-explosion valve pressure sensing stroke mechanism, and the anti-explosion valve pressure sensing stroke mechanism is fixedly connected with the anti-explosion valve top cover so that the anti-explosion valve pressure sensing stroke mechanism can operate and eject the anti-explosion valve top cover open when being stressed. The pressure color changing sensor is electrically connected with the pressure transmitter, and the pressure color changing sensor is used for collecting air pressure change data, converting air pressure change into voltage change data to generate color change information and transmitting the pressure change data to the pressure transmitter; and the pressure transmitter is used for converting the pressure change data into electric signal change data, processing the electric signal change data and sending the processed electric signal change data to the upper computer. According to the anti-explosion valve, the fire-fighting monitoring problem of the high-protection liquid cooling unit box is solved.

The present invention discloses a high-precision gas detection device, which relates to the field of gas detection technology, including a box and a protective component, an air inlet pipe is arranged on one side of the box, and an exhaust pipe is fixed on the other side of the box, the protective component is arranged inside the box, the protective component includes a motor, a double gear shaft, a driving gear, a fan blade shaft, a support sleeve, a synchronous gear, a synchronous shaft, a filter plate, a baffle frame and a brush plate, the motor is fixed at the lower end of the inner part of the box, and the top of the motor is connected with a double gear shaft. When the present invention detects gas, it only needs to start the motor so that it drives the fan blade shaft to rotate through the double gear shaft and the driving gear, so that negative pressure can be formed inside the exhaust pipe, so that suction can be generated at the air inlet pipe, so that the gas to be detected can be drawn into the box, and at this time, the dust particle impurities in the gas can be filtered out by the filter plate, so as to avoid dust interfering with the detection accuracy of the gas detection device.

The invention belongs to but is not limited to the technical field of gas concentration monitoring, and discloses a dry-type transformer fault characteristic gas detection device and method, and the device comprises a sensor module, a power supply module, and a central control module. The sensor module comprises a gas sensor and a circuit module matched with the gas sensor, and is used for collecting gas concentration data in real time by utilizing the gas sensor and transmitting the gas concentration data to the central control module; and the power supply module is composed of a power supply module, a voltage conversion module and a peripheral module and is used for providing stable power supply support for the whole system and managing communication and function integration among the components. The system is suitable for various environment monitoring requirements such as laboratories, industrial places and warehouses, the safety management level can be effectively improved, and it is ensured that the concentration change of harmful gas in the environment can be reflected in time.

The utility model provides a gas detection device based on NDIR, which comprises a PCB (printed circuit board), a bottom plate and an upper cover, the upper cover is provided with an optical cavity, the periphery of the bottom plate is embedded with the inner wall of a coaming to seal the optical cavity, the bottom plate is provided with a first through hole and a second through hole, an infrared light source on the PCB penetrates through the first through hole to extend into the optical cavity, and the infrared light source on the PCB penetrates through the second through hole to extend into the optical cavity. The dual-channel infrared sensor penetrates through the second through hole and extends into the light cavity; the dual-channel infrared sensor is provided with a first channel and a second channel, the cover plate is provided with a V-shaped reflecting plate and a light gathering plate, the light gathering plate is provided with a first reflecting surface corresponding to the first channel and a second reflecting surface corresponding to the second channel, the two sides of the light gathering plate are respectively provided with a main detection air hole, and the cover plate is provided with a plurality of auxiliary detection air holes. On the basis of an original main detection gas hole, a plurality of auxiliary detection gas holes are additionally formed in the cover plate, the gas exchange rate is increased, meanwhile, the light gathering plate is designed to be provided with double reflecting surfaces, and the increase of infrared light loss caused by the auxiliary detection gas holes is made up.

The method includes a preparation step of changing a current value or a voltage value of a power storage device; a first measurement step of obtaining a first internal resistance that is an internal resistance when a predetermined first period of time has elapsed from start of change in the current value or the voltage value in the preparation step; a second measurement step of obtaining a second internal resistance that is an internal resistance when a second period of time has elapsed from the start of change in the current value or the voltage value in the preparation step; a calculation step of calculating a resistance value difference by subtracting the first internal resistance from the second internal resistance; and a detection step of detecting generation of gas inside the power storage device based on the resistance value difference.

The invention discloses a complex stratum well cementation simulation and gas-water anti-invasion evaluation method and system, and relates to the petroleum and natural gas extraction technology, the evaluation system is provided with a simulated stratum, a buffer space, a cement sheath, a sleeve and a movable bottom plate, and two groups of hydraulic cylinders are arranged below the movable bottom plate to respectively test the shearing force of two interfaces and the compressive strength of the cement sheath; the casing pipe is provided with a pipe cavity and a cement height-returning hole, and a cement sheath is formed after cement height-returning solidification; and an acoustic logging probe and a gas detection device are arranged in the reaction kettle. The evaluation method adopts the evaluation system for evaluation. According to the evaluation system and the evaluation method, the target stratum can be simulated more accurately, the shearing force of the two interfaces and the compressive strength of the cement sheath can be tested, and the visualization mode is more convenient.

The utility model relates to a novel gas detection device. According to the technical scheme, a gas detector is installed on the left edge of the bottom of a box body, the upper gas inlet end of the gas detector communicates with the left side of a U-shaped transverse plate, a first through hole is formed in the left side of the U-shaped transverse plate, a movable plate is slidably inserted into a sliding groove of the U-shaped transverse plate, and a fixing lug is fixedly connected to the left side of the front side wall of the movable plate; a second through hole is formed in the position, corresponding to the first through hole, of the left end of the movable plate, a filter box is movably inserted into the second through hole, an air inlet pipe is arranged on the upper portion of the second through hole, an air pump is installed on the air inlet pipe, and a body of the air pump is fixedly installed on the inner wall of the front side of the box body; a filter box storage mechanism is arranged on the upper portion of the plate wall of the moving plate on the right side of the air inlet pipe, and the moving plate moves left and right through a driving mechanism installed in the box. The device has the beneficial effects that the filter box is automatically replaced, and the detection convenience is improved.

The utility model provides a gas detection device which mainly comprises a PWM (Pulse Width Modulation) speed regulation module, a vacuum self-priming pump, a gas chamber, a detection chamber comprising different gas sensors and signal conditioning circuits, a main control board, a stepping motor driving module, a stepping motor, an incremental encoder and the like which are fixed in a shell of the device, the parts can be physically and logically connected by adopting wires or communication protocols, the gas chamber can be respectively communicated with different detection chambers, gas to be detected can enter the different detection chambers through the gas chamber after the gas chamber is communicated, and the concentration of the gas is detected by utilizing different gas sensors and signal conditioning circuits; and a detection result is uploaded to the distributed control system, and alarm and real-time display are carried out through the sound-light alarm module and the display module. The real-time detection of different combustible and toxic gases is realized, the expansibility and universality of the gas detection device are greatly improved, the inventory occupation of power plant spare parts is reduced, and the economic benefit is improved.

The present application provides a gas detection device, which includes: a detection module for detecting gas concentration information and generating a first analog detection signal according to the detected concentration information; an analog-to-digital conversion module for converting the first analog detection signal into a first digital detection signal; a processing module for determining whether a gas leak occurs according to the first digital detection signal; the gas detection device includes a power supply voltage, which supplies power to the detection module, the analog-to-digital conversion module, and the processing module, and the power supply module is used to convert an external AC voltage into a power supply voltage, and the power supply module is also used to convert an external DC voltage into a power supply voltage. The gas detection device of the present application can be applied to scenarios of DC power supply and AC power supply.

The invention discloses a photoacoustic spectrum trace gas detection device and method based on a secondary demodulation technology. The device comprises a tunable laser, a laser collimation device, a focusing lens, a gas chamber, a quartz tuning fork resonance circuit, a first lock-in amplifier, a trigger capture circuit, a phase modulation circuit, a second lock-in amplifier and a control and signal acquisition device. In the aspect of automatic tracking of the frequency, the quartz tuning fork is integrated into an oscillator circuit, and automatic tracking of the laser modulation frequency is achieved. The oscillator circuit can automatically adjust the output according to the current resonant frequency of the quartz tuning fork, and ensures that the laser is always modulated at the optimal frequency. In the aspect of continuous phase modulation, traditional fixed phase setting is replaced, the phases of electric excitation and photoacoustic excitation are continuously modulated, and pure photoacoustic signals are separated by using two lock-in amplifiers, so that a complex phase calibration process is avoided, and the accuracy and stability of signal detection are improved.

The invention provides a battery thermal runaway test system, which comprises a battery, a gas outlet pipe, a first thermocouple, a second thermocouple, a first gas detection device, a gas mass flow meter, a voltage detection device, a pressure detection device and the like, the second end of the gas outlet pipe is communicated with an inlet of a gas mass flowmeter, a second thermocouple is arranged at an outlet of the gas mass flowmeter, and a first gas detection device is arranged at the outlet of the gas mass flowmeter. According to the invention, a plurality of parameter measuring devices are arranged on an air flow spraying path of the battery pressure release valve, so that synchronous acquisition of key parameters such as voltage, expansive force, spraying speed, gas concentration and temperature in the thermal runaway process of the battery is realized, and the problems of single traditional test parameter and asynchronous data are solved; and the multi-physical field coupling data of the whole thermal runaway process can be completely obtained.

A sensing element for detecting a target gas or gases is disclosed. The element includes a pair of interdigitated electrodes, with a gap between each electrode in the pair. A high surface area metal oxide nanomaterial decorated with a noble metal is deposited on interdigitated electrode pair to bridge the gap. The surface area of the metal oxide nanomaterial is greater than 100m2 / g and the size of the metal oxide nanomaterial is within the range of 100-200nm. The resistance across the pair of electrodes varies when the metal oxide nanomaterial binds with the target gas or gasses. From this sensing element, sensor chips and sensor modules may be constructed to detect multiple gases.

The invention relates to the technical field of hazardous chemicals, in particular to a hazardous chemical accident site non-contact gas detection device and detection system, the device comprises a controller, an infrared spectrum analyzer, a differential spectrum analyzer and a control unit; the hazardous chemical substance gas is subjected to field detection and sample collection in a non-contact manner, so that detection result deviation caused by field gas diffusion due to non-timely detection can be effectively prevented; according to the invention, the diffused gas can be subjected to multi-angle omnibearing detection, so that the detection effect is ensured; in addition, the system also comprises an infrared spectrum imaging acquisition system and a differential spectrum detection system in the infrared spectrum analyzer and the differential spectrum analyzer, an Internet of Things technology intelligent analysis system, a command center equipped data processing module, a user terminal data sending module and a user mobile terminal. Infrared spectrum image data and differential spectrum data of collected gas and an evaluation result can be transmitted to a user mobile terminal in real time.