606 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 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 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 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 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 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 provides a control method of semiconductor equipment and the semiconductor equipment. The control method of the semiconductor equipment comprises a purging step executed in a gas switching interval of two process gases in a gas transmission pipeline, and the purging step comprises the following steps: a control module controls a purging gas control piece to enable the gas transmission pipeline to introduce and discharge purging gas so as to carry out initial purging operation; the gas detection device detects gas concentration information in the gas conveying pipeline and sends the gas concentration information to the control module, and the control module judges whether to carry out delayed purging operation or not according to the gas concentration information until the gas concentration in the gas conveying pipeline does not exceed a preset gas concentration threshold value; and the control module obtains the initial purging parameters of the initial purging operation of the (N + 1) th cycle according to the purging parameters of the initial purging operation of the Nth cycle and the purging parameters of the delayed purging operation of the Nth cycle. According to the invention, real-time self-adaptive adjustment of the initial purging operation of each cycle is realized, and cross contamination of process gas is effectively reduced or avoided.

To provide a gas detection device, a gas detection system, and a gas detection method capable of detecting gas leaks with high accuracy.SOLUTION: A gas detection device (1) includes a light source (11) that emits light in accordance with a drive signal, a light signal detection unit that detects a signal on the basis of the emitted light and outputs a first detection signal, a sound wave detection unit that detects sound waves generated by a leak of the gas to be detected and outputs a second detection signal, a gas cell (40) having a hole (43) through which gas passes and introducing gas from the hole into a gas detection space, and a control unit (50) that switches and executes multiple operating modes. The multiple operation modes include a first mode that outputs a drive signal and performs a concentration calculation of the gas to be detected in the gas on the basis of the first detection signal and a second mode that determines the leakage or possibility of leakage of the gas to be detected on the basis of the second detection signal.SELECTED DRAWING: Figure 1

According to one embodiment, a gas detection device includes a driver section, an element section, a sensor, and a detector. The driver section includes a first driver and a second driver. The element section includes a first laser and a second laser. The first laser is configured to be driven by the first driver to emit a first beam. A first wavelength of the first beam is configured to change at a first frequency. The second laser is configured to be driven by the second driver to emit a second beam. A second wavelength of the second beam is configured to change at a second frequency. The second frequency is different from the first frequency. The second wavelength is different from the first wavelength. The sensor is configured to detect a received beam based on the first beam and the second beam.

The invention discloses a gas detection device for a greenhouse, and belongs to the technical field of gas detection sample, the gas detection device comprises an outer support ring, a plurality of floating body mechanisms are arranged in the outer support ring along the axis in a surrounding manner, the inner side of each floating body mechanism is connected with an inner support ring, the top of each inner support ring is connected with a static box, and the top of each static box is provided with a sample box; a sampling machine main body is mounted in the static box. According to the device, through the designed multiple air inlets, when the static box floats on the top of the water body, the gas environment in the static box can be reset by controlling opening of the air inlets, it is convenient to wait for regeneration of the greenhouse gas in the water body and sample the greenhouse gas in the water body after the gas environment of the static box is reset, and the accuracy of interval sampling of the greenhouse gas in the water body is improved; and the sampling precision is prevented from being influenced by non-emission of gas in a traditional static box.

The invention provides a gas detection method and a gas detection device.The method comprises the steps that gas spectral data are obtained, the gas spectral data are obtained by detecting mixed gas in a gas cell through a quantum cascade laser, and the mixed gas comprises gas to be detected; according to global index information of the gas spectrum data, obtaining a plurality of local index information, the global index information representing coordinate curves of a plurality of signals in different coordinate system quadrants in the gas spectrum data; on the basis of a Hilbert space mapping method, quadrant overturning and rotation processing is carried out on a coordinate system quadrant of the at least one piece of local index information, and initial global coordinates are obtained; calculating a new initial global coordinate by taking the initial global coordinate as new global index information, and determining the new initial global coordinate corresponding to the target order of the Hilbert curve as target spectral data; and inputting the target spectral data into the gas concentration detection model, and outputting gas concentration information of the to-be-detected gas.

The invention relates to the technical field of gas detection devices, in particular to a closed automatic detection device for product release gas. The closed automatic detection device comprises a machine table provided with a detection cavity; the interior of the detection cavity is slidably connected with a carrying table through a driving assembly, and the carrying table is used for opening and closing the front end of the detection cavity; wherein the upper part of the interior of the detection cavity is also provided with a fan cover, the interior of the fan cover is fixedly provided with a detection assembly and an air inducing assembly, the carrying platform which can be moved is used for placing a to-be-detected product, and the detection cavity can be closed after the carrying platform is reset, so that the gas of the internal product can be detected, and meanwhile, the detection efficiency is improved. When the carrying platform is reset, the floating door assemblies on the two sides can be further opened, at the moment, the two sides of the detection cavity are communicated with the external environment, when the air inducing assembly works, gas in the current environment can be detected, in this way, internal closed detection and current environment gas detection in the field are achieved, and the internal mode and the external mode are achieved.

The present disclosure relates to a gas detection device and a gas detection method which are capable of detecting N target gases in a gas sample. The gas sample is fed into a measuring chamber. M detectors each generate a signal which correlates to the concentration of at least one of the N target gases to be detected in the gas sample. A determiner comprises M inputs and N outputs. A signal, which depends on the signal of the associated measuring detector, is applied at each input of the determiner. Each output supplies information on the concentrations of the associated target gas. The determiner is trained by applying a learning method to a sample with a plurality of sampling elements. Each sample element contains M values for M signals from measuring detectors and N values of N target gas concentrations.

This invention relates to the field of gas detection technology, and more particularly to a gas detection device based on photoacoustic spectroscopy. The device comprises a laser emitting component, a first photoacoustic cell, an acoustic signal detection component, a signal amplification component, a phase detection component, and a visible light emitting component. The output end of the laser emitting component is aligned with the incident end of the first photoacoustic cell. The acoustic signal detection component is housed within the first photoacoustic cell, and its output end is connected to the input end of the signal amplification component. The output end of the signal amplification component is connected to the input end of the phase detection component. The output end of the phase detection component is connected to the laser emitting component. The visible light emitting component emits visible light towards the exit end of the first photoacoustic cell. The visible light passes through the first photoacoustic cell and propagates towards the laser emitting component, forming a calibration optical path. By adjusting the positions of the laser emitting component and the first photoacoustic cell according to the calibration optical path, the calibration of the detection optical path is achieved.

The utility model provides a leak detection mechanism which comprises a bottom plate, a sealing cover, a sealing cover lifting driving device, at least one layer of battery cell carrying disc, a mounting frame and a sealing cover guide column assembly, the battery cell carrying disc is arranged on the bottom plate and used for placing battery cells, and the sealing cover is arranged above the bottom plate through the sealing cover guide column assembly and used for lifting the sealing cover. The sealing cover lifting driving device is used for driving the sealing cover to seal the battery cell carrying disc on the bottom plate, at least one battery cell placing groove is formed in the battery cell carrying disc, and a gas detection device is arranged on the bottom plate and is used for detecting whether air in the sealing cover contains electrolyte molecules or not. By combining the sealing cover, the lifting driving device, the battery cell carrying disc and the gas detection technology, efficient, lossless and accurate leakage detection of the battery cell is achieved, and the high-standard requirement of the new energy industry for the quality of the battery cell is met.

A system for cleaning, zeroing, and preventing air pollution in indoor space includes several gas detection devices, a central control monitoring device, and several gas exchange and filtration devices. The gas detection devices detect and output indoor and outdoor air pollution data. The central control monitoring device receives the outdoor and indoor air pollution data to perform an intelligent computation and comparison, locate an air pollution location in the indoor space, and transmit a control command intelligently. Each of the gas exchange and filtration devices is combined with a smart switch for the control command to control the gas exchange and filtration devices to be enabled, so that the air pollution is filtered and exchanged by the gas exchange and filtration devices, thereby allowing the indoor air pollution data detected by the gas detection devices in the indoor space to be a safety detection value.

The invention discloses an ultrafast and high-sensitivity gas detection device and method based on gas nonlinear optics. The device comprises a high-power laser light source module, a light flux cell and a signal processing module. The light flux cell is of an integrated hollow structure, a high-reflectivity mirror face is arranged in the light flux cell to form a closed light path, laser enters the cell through an incidence hole at a certain incidence angle, 50-meter-level long-optical-path accumulation is achieved through multiple times of reflection, and the nonlinear effect excitation threshold value is effectively reduced. The light spot path is changed by adjusting the incident angle, the signal intensity is obviously enhanced by combining the nonlinear effect, and the detection limit reaches ppb level. The signal processing module extracts a target frequency component through phase-locked amplification, separates frequency domain aliasing signals in combination with wavelet transform, and reconstructs a complete nonlinear spectrum through Fourier transform. The device has the advantages of stable structure, high sensitivity, strong interference resistance and the like, and is suitable for environment trace gas monitoring and volatile organic compound early warning.

The invention discloses an underground movable gas analysis device, which belongs to the technical field of coal mine underground gas analysis and comprises a gas detection device, a communication device, a main control device, a power supply, a gas circuit control device, a sucking pump and a flat mine car. The gas detection device, the communication device, the main control device, the power supply, the gas circuit control device and the sucking pump are all mounted on the flat mine car; the power supply is respectively connected with the gas detection device, the communication device, the main control device and the gas path control device; the gas detection device and the main control device are both connected with the communication device, the main control device is further connected with the gas path control device, the gas path control device is connected with the sucking pump, and the sucking pump is connected with the gas detection device. The device integrates the functions of gas detection, automatic gas path switching, data communication and transmission, gas sampling and the like, can be mounted near a coal face, greatly shortens the sampling distance, is convenient to maintain, and improves the real-time performance and precision of gas analysis.