87 results about "Trace gas" patented technology

A gas separation method includes supplying a mixed gas to a zeolite membrane complex and permeating a high permeability gas through the zeolite membrane complex to separate the high permeability gas from other gases. The mixed gas includes a high permeability gas and a trace gas that is lower in concentration than the high permeability gas. The molar concentration of a first gas included in the trace gas in the mixed gas is higher than the molar concentration of a second gas included in the trace gas in the mixed gas. The adsorption equilibrium constant of the first gas on the zeolite membrane is less than 60 times that of the high permeability gas. The adsorption equilibrium constant of the second gas on the zeolite membrane is 400 times or more that of the high permeability gas.

The invention discloses a planetary atmospheric trace gas spectrum telemetering and in-situ fusion detection system and method, and belongs to the technical field of deep space exploration. The detection system has a telemetering mode and an in-situ detection mode, and comprises a telescope module, a laser light source module, a heterodyne spectrum telemetering module, an in-situ absorption spectrum module, a gas sampling and enriching module and a signal acquisition, processing and control module. In the on-orbit stage, a heterodyne spectrum telemetering module is adopted, and a laser light source and sunlight signals are subjected to frequency mixing for atmospheric component telemetering; and after the detector enters an atmospheric descending section, the in-situ absorption spectrum module performs in-situ absorption spectrum measurement by utilizing the detection light of the same laser light source. By performing space-time fusion and joint inversion on the data acquired in the two modes, coherent detection from large-range general survey to fixed-point detailed survey is realized, the problems of load separation of telemetering and in-situ detection and difficulty in data fusion are solved, and the detection efficiency, the data consistency and the integration level of the system are greatly improved.

The invention relates to the technical field of error analysis, in particular to a trace gas multi-filling repeatability error analysis and compensation method which comprises the following steps: collecting gas pressure pulsation data and container inner wall adsorption layer thickness change data in a filling stage; inputting the pressure pulsation data into a dynamic coupling analysis module to calculate correlation degree parameters of an adsorption hysteresis effect and a pressure fluctuation frequency spectrum; an adsorption-pressure dynamic coupling correction model is established through a phase-space reconstruction algorithm, and composite correction parameters including the valve response lead and the temperature compensation slope are generated; and the composite correction parameters are input into a filling execution mechanism, and reconstruction of an electromagnetic valve control time sequence and dynamic correction of a temperature control curve are completed before the next filling cycle is started. According to the method, the deep coupling characteristics causing the filling error can be identified, and the sensitivity and pertinence of error analysis are improved.

The invention relates to an air tightness detection device and method based on resonance frequency shift of a resonant cavity, belongs to the technical field of air tightness detection, and aims to solve the problems of high equipment cost, complex operation, low efficiency and difficulty in realizing multi-parameter quantitative detection in the traditional air tightness detection technology. High-purity helium with rated pressure is filled into a to-be-detected piece through a gas compressor, the to-be-detected piece is placed in a volume-adjustable detection container after pressure maintaining, and leaked helium is pumped by a vacuum pump to flow into a resonant cavity; resonance frequency deviation caused by helium concentration changes is monitored, temperature and humidity calibration data are combined, three air tightness parameters including the leakage rate (Pa.m / s), the leakage speed (mL / min) and the leakage pressure (Pa) are calculated in real time through a microcontroller, and the air tightness grade of a to-be-detected piece is output according to the air tightness detection standard. According to the device, the volume of the detection container is adaptively adjusted through the sliding rail, and the detection efficiency and adaptability can be remarkably improved by combining frequency mixing excitation and a rapid frequency calibration technology; according to the method, resonance frequency shift-helium concentration-airtightness parameters are converted, and high-precision, multi-parameter and integrated airtightness detection is realized. The invention has the advantages of fast response speed, strong anti-interference performance, low cost and the like, is suitable for fast automatic leak detection of industrial products such as sealing devices, pressure containers and the like, and provides a new scheme for trace gas detection and gas tightness grading.

The utility model discloses a device for determining the hole sealing depth of a coal seam gas extraction drill hole, and belongs to the field of coal mine underground gas extraction. The device comprises a tracing gas cylinder, a bundling pipe, an automatic valve, a flow sensor, a pressure sensor, an extraction pipe and an SF6 detector. The tracer gas cylinder is connected with a bundling pipe, the bundling pipe is communicated into the tracer gas chamber, a pressure sensor is arranged in the tracer gas chamber, a flow sensor and an automatic valve are arranged in the bundling pipe, the bundling pipe is communicated into the tracer gas chamber, and the extraction pipe is connected with an SF6 detector. The device solves the problems that in the prior art, the tracer gas detection precision is insufficient, the leakproofness of a hole sealing area cannot be judged, the hole sealing depth quality evaluation time is long, and the precision is low. Through intelligent and automatic improvement, accurate and rapid detection of the concentration and pressure of the tracer gas in the tracer gas chamber is realized.

The invention provides a drilling gas cut monitoring method and device based on a magnetic induction effect, and the method comprises the steps: pumping drilling fluid carrying magnetic particles marked by a magnetic marker into a shaft, and measuring the nearby magnetic field intensity through a magnetic signal induction short section arranged at the bottom of the shaft to obtain magnetic field data; and acquiring gas cut monitoring data according to the change condition of the magnetic field data in the preset period. Therefore, by monitoring the magnetic signal which responds to the gas cut very quickly, advanced early warning of the early trace gas cut is realized, and the response speed and sensitivity are superior to those of a sound wave or resistivity method; by actively introducing a magnetic marker and adopting a differential detection and temperature compensation algorithm, the problems that a resistivity method is greatly interfered by a stratum and a sound wave method is seriously influenced by well conditions and noise are effectively solved, the anti-interference capability is high, and the reliability is high.

The invention relates to a gas-sensitive sensor technology, and particularly discloses a gas-sensitive sensing device based on a three-dimensional bionic spiral step structure, which comprises a three-dimensional bionic spiral step substrate, a flexible electrode mounted on the inner wall of the three-dimensional bionic spiral step substrate, and a gas-sensitive film deposited on the surface of the flexible electrode. According to the device, trace gas such as volatile organic compounds and the like entering the gas chamber can be guided by the specific three-dimensional bionic spiral stepped structure to bypass along a spiral path for multiple circles and repeatedly sweep over the surface of a gas sensitive film, so that the effective contact opportunity of gas molecules and a sensitive layer is remarkably increased. By simplifying the installation mode of the three-dimensional bionic spiral stepped substrate and the flexible electrode, the background interference of small organic molecules slowly released in the curing and aging process of a traditional adhesive on trace gas detection is avoided. Meanwhile, the idea of parallel connection of multiple sensors is provided, and the problems that an existing gas sensitive sensor of a plane structure is insufficient in low-concentration gas detection sensitivity and high in detection limit are effectively solved.

The invention relates to the technical field of differential absorption spectrum inversion, and discloses an ozone precursor monitoring method and system based on a two-channel differential absorption spectrum and nonlinear inversion, a terminal and a storage medium, the method comprises the following steps: synchronously obtaining a target spectrum and a reference spectrum of a target area to calculate a multiband atmospheric differential optical thickness; building a combination model based on the difference optical thickness of each wave band, dividing a fitting window, and obtaining the difference inclined column concentration through multi-angle fitting; and inverting a vertical concentration distribution profile of the ozone precursor by using different sensitivities in combination with a radiation transmission model and a logarithmic space iterative inversion algorithm. According to the invention, through a high-performance dual-channel spectrometer observation system and a high-precision nonlinear inversion algorithm, high-spectral-resolution measurement of ultraviolet-visible light full wavebands is realized, logarithmic space processing is introduced in inversion, the inherent problems of strong nonlinearity and large dynamic range of a vertical profile of aerosol and trace gas are effectively solved, and the measurement accuracy is improved. And the measurement precision and stability are improved.

The invention relates to the technical field of gas analysis, in particular to a trace gas inlet device and method suitable for the front end of a gas chromatograph, and the device comprises a sample tank assembly, a vacuum system, a cryogenic unit, a pulse flushing system, a flow path control assembly and a residual sample storage assembly; the sample tank assembly fixes a copper pipe containing trace gas through a copper pipe fixer, the vacuum system vacuumizes to eliminate interference, the cryogenic unit realizes complete gas release through low-temperature enrichment, the pulse flushing system cleans a pipeline, and the flow path control assembly accurately distributes the gas flow direction through a three-way diverter valve. And the residual sample storage assembly transfers residual gas to an external gas storage tank by using a micro sucking pump. The device realizes high-efficiency lossless sample injection of a trace closed gas sample, improves analysis precision and reliability, supports multiple recheck of the sample, can be seamlessly connected with an existing gas chromatograph, and has important practical value in exploration and analysis of strategic gas resources such as helium and natural hydrogen.

The invention discloses a flow detection device with environment temperature and humidity and gas concentration recognition, and relates to the pneumatic field, the flow detection device comprises a gas pipe partial pressure part and a gas flow monitoring part, the gas pipe partial pressure part comprises a gas flow pipeline and a partial pressure hole, the partial pressure hole is embedded in the center of the inner wall of the gas flow pipeline, the diameter range of the partial pressure hole is 2-6 mm, and the gas flow monitoring part is connected with the gas flow pipeline. The partial pressure hole is used for dissipating air flow in the air flow pipeline to the outside, the partial pressure hole is connected with the air flow monitoring part through a soft air pipe, and the soft air pipe is used for stably guiding dissipated air into the air flow monitoring part; through the design of the partial pressure hole of the partial pressure part of the gas pipe, the stable transmission of the soft gas pipe, the friction electric signal collection of the contact layer and the copper film, and the Bernoulli equation, the gas flow is calculated, the problem that the sensitivity of a traditional sensor is insufficient in the 10Pa extreme vacuum environment is solved, and the high-precision detection of trace gas flow in the vacuum environment is realized.

The application discloses a seawater trace gas identification method based on multi-color column cooperation and machine learning, relates to the technical field of gas chromatography analysis, and comprises the following steps: preparing a gas sample to be identified and performing gas chromatography detection on the gas sample; performing denoising, normalization processing and outlier rejection on the gas chromatography; extracting manual peak characteristics and time sequence peak characteristics to form a multi-dimensional feature set; performing hierarchical screening on the feature set and retaining core features; constructing a KNN model and a CNN model double-model fusion architecture; dividing the features into a training set and a verification set, training and verifying the double-model architecture, and optimizing double-model architecture parameters; and applying SHAP analysis to the model decision process to generate a feature importance visualization report. The application does not need to rely on accurate standard sample calibration, efficiency and adaptability are improved, personalized detection demands of different scenes are adapted, SHAP technology is introduced to clearly determine the contribution degree of key identification features, and interpretability and reliability are enhanced.

The invention discloses a preparation method of PdO / alpha-MoO3 hollow microspheres and a gas sensitive element based on in-situ growth. The preparation method comprises the following steps: growing multilevel-structure PdO / alpha-MoO3 hollow microspheres with different PdO composite molar ratios on a ceramic tube in situ by adopting a solvothermal method; when the PdO / alpha-MoO3 composite material with the molar ratio of PdO being 2.5 at% has the best sensing performance to triethylamine gas, the response value of the material to 50ppm triethylamine gas is 122.1 at the optimal working temperature of 217 DEG C, the triethylamine gas as low as 0.1 ppm can be detected, the trace gas monitoring requirement is met, and the composite material is suitable for early warning or trace pollutant detection in a severe environment; the response speed is accelerated, the response time to the triethylamine gas is only 28.6 seconds, the gas concentration change can be captured in time, the real-time monitoring efficiency is improved, and the mechanism of the influence of the formation of the p-n heterostructure on the gas-sensitive performance is disclosed; in addition, the anti-interference capability is strong, and compared with interference gases such as aniline, acetone, ammonia gas and the like, the sensor has remarkable selectivity on triethylamine.

The present application relates to the technical field of error analysis, in particular to a trace gas multiple filling repeatability error analysis and compensation method, comprising the following steps: collecting gas pressure pulsation data and container inner wall adsorption layer thickness change data in the filling stage; inputting the pressure pulsation data into a dynamic coupling analysis module to calculate the correlation degree parameters of adsorption hysteresis effect and pressure fluctuation spectrum; establishing an adsorption-pressure dynamic coupling correction model through a phase space reconstruction algorithm to generate composite correction parameters including valve response advance and temperature compensation slope; inputting the composite correction parameters into the filling actuator to complete the reconstruction of electromagnetic valve control timing and dynamic correction of temperature control curve before the start of the next filling cycle. The present application can identify the deep coupling characteristics causing filling errors and improve the sensitivity and pertinence of error analysis.

The embodiment of the invention provides a biomass incineration fire point determination method and device, computer equipment and a medium, and relates to the technical field of atmospheric environment remote sensing monitoring, and the method comprises the steps: obtaining the column concentration of atmospheric trace gas, the profile of the atmospheric trace gas, the land utilization type and biomass incineration related data of a to-be-monitored area; according to the column concentration of the atmospheric trace gas and the atmospheric trace gas profile, calculating the near-surface atmospheric trace gas column concentration; according to the spatial-temporal variability of the near-surface atmosphere trace gas column concentration, determining an abnormally high-value grid in the near-surface atmosphere trace gas column concentration; and verifying the biomass incineration rationality of the abnormal high-value grid through the land utilization and biomass incineration related data, and determining the abnormal high-value grid passing the biomass incineration rationality verification as a biomass incineration fire point. According to the scheme, the accuracy and effectiveness of determining the biomass incineration fire point can be improved.

The present application relates to a kind of gas standard substance preparation and its method for setting value, belong to standard substance preparation and analytical detection technical field.It is effective to reduce component adsorption and loss by applying nanoscale anti-adsorption coating on the inner wall of gas cylinder, significantly improve the storage stability of gas standard substance;Combined with multistage dynamic dilution device and real-time compensation of temperature, pressure and other environmental parameters, high-precision, automatic configuration of trace and ultratrace gas components is realized.In the setting value link, intelligent data processing algorithm is used to enhance spatial uniformity analysis and setting value accuracy.The method significantly improves the configuration efficiency, accuracy and traceability of standard gas, and is suitable for environmental monitoring, industrial process control and other fields.

The invention provides a high-pressure mixed gas preparation method considering temperature and pressure influences, and relates to the technical field of unconventional natural gas extraction. Comprising the following nine steps: determining constant parameters, determining proportioning concentration, initializing a pressure value, calculating the partial pressure of each component of mixed gas, vacuumizing a device, filling a component I gas, vacuumizing a pipeline, filling a component I gas and analyzing the components of the gas. According to the method, the partial pressure of each component gas is accurately calculated in combination with the compression factor, so that high-precision and flexible preparation of the mixed gas components can be realized, high cost caused by frequent purchase of prefabricated gas is avoided, trace gas can be accurately prepared according to actual requirements, and gas consumption and cost are greatly reduced. And meanwhile, the repeatability and the reliability of the gas preparation process are improved, and the device is particularly suitable for experiment conditions of high pressure and various gas components.

The invention belongs to the technical field of gas detection pretreatment, and particularly relates to a multistage deep water removal pretreatment system for atmospheric trace gas detection. In order to efficiently remove water vapor and interference components in sample gas and solve the problem of interference of a high-humidity environment on quantitative analysis of trace gas, a four-stage cascade water removal structure is adopted, and the water removal limit of a single-stage technology is broken through through a physical synergistic mechanism of condensation (phase change dehumidification), membrane separation (selective permeation), cryogenic treatment (ultralow temperature capture) and adsorption (molecular sieve capture). The full-automatic deicing logic based on a fixed time period (non-temperature sensing) thoroughly avoids manual intervention.

The utility model relates to flow measuring equipment and a tracer gas sampling device thereof, and the sampling device is arranged at the downstream of a tracer gas injection point of a flow pipeline to be measured. The sampling device comprises a plurality of gas extraction mechanisms which are mechanically connected with the to-be-measured flow pipeline so as to synchronously extract sample gas formed by mixing tracer gas and gas conveyed by the pipeline; the plurality of gas collecting pieces are mechanically connected with the plurality of gas extraction mechanisms one by one and are used for collecting the sample gas; and the control module is electrically connected with the plurality of air exhaust mechanisms and is used for controlling the plurality of air exhaust mechanisms to work. According to the utility model, the problem of poor flow measurement accuracy caused by gas concentration deviation at different sampling point positions and obvious time difference of sampling time of different sampling points is solved, the credibility of sample gas is improved, and the flow measurement accuracy is further effectively improved.

The application relates to the technical field of mass spectrometry in-situ cell, and discloses a membrane electrode in-situ cell for differential electrochemical mass spectrometry working condition characterization, which comprises a transition plate, a through hole is formed in the transition plate, a hydrophobic air-permeable membrane is arranged in the through hole, and the membrane electrode in-situ cell further comprises a membrane electrode assembly, the membrane electrode assembly comprises a proton exchange membrane and catalytic layers arranged on the two sides of the proton exchange membrane, and the two sides of the proton exchange membrane are connected with polar plates through gas diffusion layers, and flow channels are arranged in the polar plates; the physical barrier of the hydrophobic air-permeable membrane fundamentally prevents a large amount of water vapor from entering the mass spectrometer, protects the instrument, and improves the detection sensitivity and accuracy of trace gas products; and the standard MEA without modification is directly tested, the real working state is maintained, and the obtained data can better reflect the actual application performance; in addition, an external cold trap, a drying tube and a long-distance transmission pipeline are omitted, the path of the gas from generation to entering the mass spectrometer is extremely short, the response time is fast, and the system dead volume is small.

The utility model discloses a safe and reliable burner water gas leakage detection device which comprises a burner cooling water return tank, an online detection system, a ratio length type CO gas detection pipe, a valve and a portable trace gas sampling pump. The top of the burner cooling water return tank is connected with a blow-down pipe, the blow-down pipe is respectively connected with an on-line detection system and an inlet of the portable trace gas sampling pump through a first connecting pipe and a second connecting pipe, and the valve is arranged on the second connecting pipe. And the ratio length type CO gas detection pipe is connected to an outlet of the portable trace gas sampling pump. The device has the advantages that the device is higher in accuracy and reliability, leaked CO can be captured for a long time, and personnel do not need to be specially allocated to wait for observation at a monitoring point. And a detection point is placed at a safe position far away from the gasification furnace body, so that the safe operation environment is improved.

The invention discloses a full-scale deep sea dissolved CH4 in-situ sensor, and belongs to the technical field of deep sea dissolved gas in-situ detection, and the full-scale deep sea dissolved CH4 in-situ sensor comprises a circuit system unit, a trace gas measurement cavity unit and a water-gas separation unit; the circuit system unit comprises a microcontroller, a frequency synthesizer, a summator, a laser, a laser driving circuit, two analog lock-in amplifiers, two pre-amplifiers and two analog-to-digital converters; the trace gas measuring cavity unit comprises a trace gas measuring cavity, an optical fiber collimator, a tuning fork, a coaxial micro resonant tube, a temperature, humidity and air pressure sensor, a photoelectric detector, two electromagnetic valves and a micro air pump; the water-gas separation unit comprises a base, a sintered block, filter paper and a water-gas separation membrane; the miniaturized deep sea dissolved CH4 high-sensitivity full-range in-situ sensor with low gas consumption has the advantages of high sensitivity, full range, low gas consumption, strong anti-interference capability, fast response, low power consumption, small size and the like.

A gas analyzer capable of repeatedly measuring and analyzing trace amounts of gas contained in a gas to be measured with high sensitivity, stability, and good reproducibility. [Solution] A gas analyzer comprising: a mass manifold that holds an ion source and quadrupole section of a quadrupole mass spectrometer; a nozzle provided within the mass manifold with an outlet positioned near the ion source; a gas injection pipe that communicates with the outlet of the nozzle and supplies a gas to be analyzed toward the ion source through the outlet; and an exhaust pipe that communicates with the outlet of the nozzle and is configured to exhaust the gas in a direction different from the direction of ejection of the gas to be measured.

The application discloses a multi-stage coupling amplification photoacoustic spectrum greenhouse gas measuring system and method, and belongs to the technical field of trace gas measurement. The measuring system comprises a micro multi-pass variable-diameter T-shaped photoacoustic cell, a gas distribution system, a DFB laser, and a data acquisition and processing system. Reflectors one and two are arranged at the two side windows of the micro multi-pass variable-diameter T-shaped photoacoustic cell. The gas distribution system introduces the to-be-measured gas into the gas chamber of the micro multi-pass variable-diameter T-shaped photoacoustic cell. The DFB laser generates modulated laser, which enters the micro multi-pass variable-diameter T-shaped photoacoustic cell through the collimating lens from the incident hole of the reflector one, and is reflected back and forth between the reflectors two, so that multi-stage coupling amplification photoacoustic signals are generated, and then the signals are demodulated by a lock-in amplifier, and enter the data acquisition and processing system. Through multiple reflections in the micro multi-pass variable-diameter T-shaped photoacoustic cell, the interaction between the laser and the gas is enhanced, so that the monitoring of the methane gas concentration is more accurate and reliable.

This utility model relates to an ultra-trace gas detection device in silane gas, comprising a gas concentrator, a gas chromatograph, and a liquid nitrogen tank. The gas concentrator is connected to a main gas pipe, which is connected to five branch pipes: a helium pipe, a first standard gas pipe, a second standard gas pipe, a sample inlet pipe, and a first tail gas pipe. The gas chromatograph is equipped with a PDD detector and is connected to a first carrier gas pipe and a second tail gas pipe. A second carrier gas pipe and a sample pipe are connected between the gas concentrator and the gas chromatograph. A liquid nitrogen inlet pipe is connected between the gas concentrator and the liquid nitrogen tank. This utility model's ultra-trace gas detection device in silane gas has a novel structure and reasonable design, and can analyze phosphine, arsine, and hydrogen sulfide in silane gas at concentrations below 10 pptv. It features safety, high efficiency, stability, and high sensitivity.

The invention belongs to the technical field of atmospheric trace gas detection, and particularly relates to a laser heterodyne radiometer for locking local oscillator optical power based on an adjustable optical attenuator. Comprising a variable optical attenuator and an optical fiber beam splitter, and the optical fiber beam splitter transmits local oscillation light attenuated by the variable optical attenuator to a first photoelectric detector and a frequency calibration module and carries out beam combination and frequency beating on the local oscillation light and signal light; the output end of the first photoelectric detector serves as the input end of the PID controller, a control signal is calculated and sent to the variable optical attenuator, and the frequency calibration module and the signal processing module are jointly and sequentially connected with the acquisition card and the upper computer to output a measurement result. By combining the variable optical attenuator with digital PID feedback control, dynamic and closed-loop locking of local oscillator optical power is realized, an atmospheric absorption spectrum without a slope baseline can be obtained, and the accuracy of measuring the atmospheric gas concentration by the laser heterodyne radiometer is effectively improved.

The utility model discloses a device for detecting the concentration of multi-component trace gas, and particularly relates to the technical field of gas detection equipment, the device comprises a gas chromatograph main body, one side of the outer surface wall of the gas chromatograph main body is connected with a gas inlet pipe, the lower end of the gas inlet pipe is fixedly connected with a fixed seat on the outer surface wall of the gas chromatograph main body, and the fixed seat is fixedly connected with the gas chromatograph main body. A treatment cylinder is connected to the interior of the fixed seat, a partition plate is connected to the interior of the treatment cylinder, and a concentration structure is arranged on one side of the partition plate. By arranging the concentration structure, low-concentration trace gas can be concentrated and enriched, extremely-low-concentration gas which is originally difficult to detect is gathered in quantity, the concentration of the trace gas in a gas sample is greatly improved, and a detection signal becomes easy to capture and analyze from weak, so that the detection sensitivity is greatly enhanced; trace gas components which are possibly omitted in the past can be accurately found, and the reliability and the accuracy of a detection result are improved.

The application belongs to a synthetic ammonia device acid gas comprehensive utilization device and a comprehensive utilization method; including a gasification system acid gas unit, a low-temperature methanol washing system acid gas unit and a shift stripping tower acid gas unit, the gasification system acid gas unit is connected with the heat tracing gas import of the Claus combustion furnace and the heat tracing gas import of the waste gas combustion furnace in the sulfur preparation unit respectively; the low-temperature methanol washing system acid gas unit is connected with the import of the Claus combustion furnace, the shift stripping tower acid gas unit is connected with the import of the waste gas combustion furnace; the top tail gas outlet of the waste gas combustion furnace is connected with a tail gas treatment unit, the tail gas treatment unit is coupled with an ammonium sulfite solution preparation unit, the ammonium sulfite solution preparation unit is connected with an ammonium sulfate preparation unit; having comprehensive treatment of the acid gas in the synthetic ammonia device, and realizing the circulating operation of the whole system, not only solving the environmental protection emission problem of the enterprise, but also bringing great profit to the enterprise.

The utility model belongs to the technical field of gas pretreatment mechanisms, and discloses a pretreatment mechanism of trace gas analysis equipment, which comprises a machine body, a gas inlet pipeline is arranged above the machine body, the gas outlet end of the gas inlet pipeline is connected with a treatment box, one end of the gas inlet pipeline extending into the treatment box is connected with a first conical pipeline, and the other end of the gas inlet pipeline is connected with a second conical pipeline. A first conical pipeline is arranged on the air inlet pipeline, a dust collecting bag which is easy to disassemble and assemble is arranged on the first conical pipeline, and filtering assemblies are arranged on the periphery of the outer wall of the treatment box. The shape of the first conical pipeline is gradually enlarged from the smaller diameter of the air inlet pipeline to the larger diameter of the dust collecting bag; the filtering assemblies are arranged on the periphery of the outer wall of the treatment box, so that the gas is promoted to be uniformly distributed on the surface of the dust collection bag, the gas is prevented from being concentrated in a certain local area, and the local flow velocity of the surface of the dust collection bag can be effectively reduced through uniform distribution.

The invention belongs to the interdisciplinary category of the field of trace gas standard substance preparation technology and geochemical research, and particularly relates to a high-fidelity gaseous mercury generation device and method for mercury isotope fractionation simulation. The system is characterized by comprising a multi-container system which comprises at least a first container and a second container which are connected in a sealing manner; the gas communication unit is connected with the multi-container system and the carrier gas supply unit by adopting a pipeline made of an inert material; the carrier gas supply unit provides inert carrier gas and is communicated to the gas communication unit; and the temperature control unit is used for regulating and controlling the environment temperature of the multi-container system.

A device for measuring atmospheric trace-gas slant column density is disclosed. The device includes a diffuse reflector that receives direct sunlight and provides diffusely reflected sunlight to a front focusing lens. The lens collects and focuses the reflected sunlight into a fiber optic bundle having a common end and at least three fiber bundle legs. The bundle generates a homogenized irradiance distribution and delivers substantially proportional optical power to each leg. Each leg feeds an optical channel including a collimating lens, an ultra-narrow bandpass optical filter, a focusing lens, and a photodetector that produces a photocurrent signal representative of intensity in a selected wavelength band. An electronics module converts the photocurrent signals into digital values, and a processing unit acquires the values simultaneously and continuously to determine a trace-gas slant column density within the device's field of view.