17 results about "Trace gas" patented technology

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 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.

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.

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.

The present application relates to the field of trace gas detection, especially to a device for calibrating a gas trace particle optical detection instrument, which comprises: a cabinet, including a cabinet shell and a cabinet hatch; a mounting platform installed inside the cabinet shell; an air compression assembly installed on the mounting platform, with an output end outputting high-pressure air through a first pipeline; a filtering assembly connected to the first pipeline at an input end and connected to a second pipeline at an output end to output high-pressure clean air; and an atomization assembly including an atomization cup mounting portion and a standard sample atomization cup, connected to the second pipeline at an input end and connected to a third pipeline at an output end to output aerosol. Each component of the sample supply device is arranged inside the cabinet, and the standard sample bottle is installed and replaced through the atomization assembly, so that aerosol with different sizes of particles can be quickly and flexibly transported for calibration by the rear-end detection instrument accordingly, and the cabinet can be closed for carrying and placing after the test is completed.

This invention relates to the field of atmospheric trace gas detection technology, specifically disclosing an ultra-high sensitivity online detection system and method for atmospheric BrO radicals. The ultra-high sensitivity online detection system for atmospheric BrO radicals includes an optical cavity, a 340 nm ultraviolet light source, an ultraviolet optical fiber, an ultraviolet spectrometer, and a sampling unit. The optical cavity has an inlet and an outlet, and contains an ultraviolet optical resonance region. Ultraviolet light emitted from the ultraviolet light source is reflected multiple times in the ultraviolet optical resonance region and then transmitted into the ultraviolet optical fiber. The ultraviolet optical fiber is used to superimpose all transmitted light in the ultraviolet band and transmit it to the ultraviolet spectrometer. The sampling unit is used to directly input the gas to be measured into the optical cavity, or to selectively remove BrO radicals from the gas to be measured before inputting it into the optical cavity. This invention achieves ultra-high sensitivity online point detection of BrO radicals in the atmosphere. Compared with existing technologies at home and abroad, its BrO detection limit is better than 1 pptv, reaching the sub-pptV level, demonstrating excellent detection performance.

This invention relates to the field of building equipment automation and predictive maintenance technology, and particularly to an online control method and device for HVAC duct gas. The method includes: acquiring pressure signals from a closed-loop HVAC duct system; extracting multi-dimensional fluctuation features from the pressure signals to obtain pressure signal characteristics; weighted fusion of the signal features to obtain a comprehensive diagnostic index; based on the pressure signals, performing fault-tolerant judgment on the operating conditions of the HVAC duct; determining the diagnostic threshold of the comprehensive diagnostic index based on the fault-tolerant judgment result; comparing the comprehensive diagnostic index with the diagnostic threshold; and executing corresponding graded exhaust control actions for the HVAC duct based on the comparison result. This invention can solve the problems of high hardware and maintenance costs, difficulty in detecting accumulated trace gases in existing technologies, and the limitations of detection technologies, which are limited to direct detection or single-feature judgment, and cannot effectively identify dynamic pressure fluctuation characteristics, making early and accurate gas diagnosis difficult.

This utility model relates to the field of gas sensor technology and discloses an infrared micro-gas sensor, comprising: a lower sleeve, the lower sleeve being cylindrical; a filter structure, the filter structure including a first filter part and a second filter part, the first filter part including an upper sleeve disposed at the top of the lower sleeve, a filter plate disposed inside the upper sleeve, two sets of second arc-shaped snap-fit ​​grooves being formed on the outer wall of the filter plate, and two sets of first arc-shaped limiting blocks being fixedly installed on the inner wall of the upper sleeve, the first arc-shaped limiting blocks being snap-fitted into the interior of the second arc-shaped snap-fit ​​grooves; the second filter part including a first arc-shaped snap-fit ​​groove formed at the bottom of the first arc-shaped limiting blocks, achieving the purpose of limiting and fixing the filter plate, improving the fixing effect of the filter plate, improving the protection capability, enabling quick disassembly and installation of the filter plate, improving the cleaning efficiency of the filter plate, improving the durability of the device, and extending the service life of the device.

The present disclosure relates to a method of quantification of methane enhancements. The method includes deploying an anemometer of a measurement system to measure wind variables at a point source emitter. A trace gas analyzer of the measurement system is deployed to measure a trace gas concentration at the point source emitter. The trace gas concentration is quantified using a peak covariance equation, wherein the peak covariance equation comprises: Fx = β0 + ∑iβixi + ∑j≠kβjxjxk wherein Fx is an emission rate, βs are regression coefficients, and x is the measured wind speed and trace gas concentrations.

The application belongs to the technical field of gas sensors, and more particularly relates to a room-temperature ferroelectric polarization semiconductor gas sensor and an application thereof. In the application, an alpha-In2Se3 nanosheet dispersion liquid is coated on a test electrode and an upper surface of a substrate not covered by the test electrode to form an alpha-In2Se3 gas-sensitive layer, and the gas-sensitive layer is polarized and regulated by using a corona polarization treatment. The gas sensor prepared by using the method can realize high-sensitivity and high-selectivity detection of typical gases (such as nitrogen oxide gas, ammonia gas, chlorine gas, ozone and the like) at room temperature, and the detection limit is as low as a ppb level, and the response performance of the gas sensor can be dynamically regulated by adjusting polarization parameters. The room-temperature ferroelectric polarization semiconductor gas sensor provided by the application has the advantages of simple structure, low power consumption, fast response and fast recovery, and is suitable for trace gas detection in the fields of environmental monitoring and industrial safety.

This application discloses a full-range deep-sea dissolved CH4 in-situ sensor, belonging to the field of deep-sea dissolved gas in-situ detection technology. The full-range deep-sea dissolved CH4 in-situ sensor includes a circuit system unit, a trace gas measurement chamber unit, and a water-gas separation unit. The circuit system unit includes a microcontroller, a frequency synthesizer, an adder, a laser and a laser driver circuit, two analog lock-in amplifiers, two preamplifiers, and two analog-to-digital converters. The trace gas measurement chamber unit includes a trace gas measurement chamber, an optical fiber collimator, a tuning fork, a coaxial microresonator, a temperature, humidity, and pressure sensor, a photodetector, two solenoid valves, and a miniature air pump. The water-gas separation unit includes a base, a sintered block, filter paper, and a water-gas separation membrane. This disclosure provides a miniaturized, high-sensitivity, full-range in-situ sensor for deep-sea dissolved CH4 with low gas consumption, featuring high sensitivity, full range, low gas consumption, strong anti-interference ability, fast response, low power consumption, and small size.

The application discloses a gas pipeline leakage monitoring method and isolation device based on background-oriented schlieren, and relates to the technical field of gas pipeline safety monitoring. The method comprises the following steps: acquiring a real-time background schlieren image of a target area; performing regional matching on an initial background schlieren image block set of the target area by using the image, obtaining a displacement vector set, and performing interpolation and line-by-line averaging to obtain a real-time characteristic function; screening a comparison characteristic function without a discrimination mark in a leakage database, calculating the similarity between the comparison characteristic function and the real-time characteristic function, and judging whether the target area has gas leakage by judging whether the similarity between the two exceeds a threshold value. The application can also timely investigate the case of trace gas leakage with low leakage rate and difficult to gather to reach a dangerous concentration, thereby reducing the potential risk of the gas pipeline due to trace gas leakage. In addition, the isolation device can timely pop up an airbag according to the leakage information to stop further gas leakage, thereby providing reliable safety protection for the gas pipeline.

This invention belongs to the field of gas pipeline fault prediction technology. It discloses a method, system, and inspection robot for identifying defects in gas pipelines in utility tunnels. The method includes: synchronously sensing multi-dimensional time-series data of the gas pipeline in the utility tunnel, including gas pipeline time-series data, combustible gas concentration time-series data, and environmental time-series data; performing structured processing and feature extraction on the multi-dimensional time-series data to output a multi-modal feature data set for defect identification and risk assessment; performing joint modeling based on the multi-modal feature data set to obtain a fused interactive embedding vector, and identifying coupled abnormal states with causal correlation or synergistic performance between structural defects and trace gas leaks based on the fused interactive embedding vector; and identifying early defect types in the gas pipeline in the utility tunnel based on the fused interactive embedding vector and the coupled abnormal states. This application significantly improves the accuracy and response speed of early defect identification in gas pipelines in utility tunnels.

The application provides a trace gas in-situ measuring instrument suitable for deep sea environment and a detection method, and belongs to the technical field of electric digital data processing.The trace gas in-situ measuring instrument suitable for deep sea environment is carried on a remote control unmanned submersible or an autonomous underwater vehicle, pressure values and temperature values are collected, the pressure values, the temperature values and the permeation concentration sampling values in a permeation initial time sequence are input into an artificial intelligence membrane mass transfer dynamic compensation model, a predicted extreme concentration is output in advance to judge a filling state, an infrared detection module emits infrared light of each detection wave band, the infrared light is fitted by a full spectrum line matrix and is decoupled by a partial least square method, the concentration values of each target gas are calculated according to the Beer-Lambert law, and the membrane mass transfer dynamic compensation model is dynamically adjusted by a permeation state evaluation function to update step length parameters, so that the technical problems of permeation lag of a selective semi-permeable membrane caused by low temperature and high pressure in the deep sea and long response time of in-situ infrared detection are solved.

The application discloses a kind of multi-channel trace gas automatic metering device and metering method, belong to gas flow measurement field, solve multi-channel trace gas detection difficult, insufficient precision, low automation degree and other problems.The device includes multiple sets of gas collection water column unit, cantilever type rotatable metering unit, device shell, limit switch, temperature sensor, reversing electromagnetic valve and control unit;Gas collection water column unit is combined with gas collection bag and water column to form gas-water separation structure, and cantilever type metering unit is rotated by gap driven non-contact liquid level sensor by stepper motor.When metering, scanning parameters are set first, and limit switch positioning sensor is used to scan each water column water level in turn, and reversing electromagnetic valve realizes gas path switching, combined with temperature compensation, exhaust volume and rate are calculated according to the number of electromagnetic valve actions and water level change.The device can be continuously and efficiently metered in multiple channels, and is convenient to disassemble and expand, has water level, motor abnormal alarm function, can automatically collect, store and display data, reduces labor cost and improves metering accuracy.

This invention provides a method for detecting the gas composition of bubbles inside continuously cast billets. The method includes: identifying and locating the size, morphology, and spatial position of target bubbles in a continuously cast billet sample using three-dimensional non-destructive scanning technology; processing the sample according to the location information to bring the bubbles close to the surface; solidifying the gas inside the bubbles through cryogenic freezing; exposing the inner wall of the bubbles using focused ion beam micro-windowing; and performing in-situ scanning of the exposed inner wall surface using time-of-flight secondary ion mass spectrometry to obtain composition and spatial distribution information. This invention achieves precise location and direct detection of trace components in microbubbles without relying on gas volume, solving the problem of existing technologies being unable to accurately locate bubbles and detect trace gases, thus providing a reliable basis for diagnosing bubble formation.