82 results about "Infrared gas analyzer" patented technology

The invention belongs to the technical field of gas detection and relates to a laser infrared gas analyzer based on TDLAS-WMS (tunable diode laser absorption spectroscopy-wavelength modulation spectroscopy) for detecting hydrogen chloride, methane, carbon monoxide, water vapor and other gases. The laser infrared gas analyzer comprises a laser, a laser driving circuit, a temperature control circuit, an optical system with an optical cavity, a main detector, a reference detector, an intensity modulation and canceling circuit, a phase-locking and amplification circuit and a data acquisition and display circuit, wherein the laser driving circuit and the temperature control circuit are used for controlling the laser to emit light, the two ends of the optical system are respectively connected with the laser and the detector, the intensity modulation and canceling circuit is used for canceling the influence of intensity modulation in the system, the phase-locking and amplification circuit is used for extracting harmonic signals, and the data acquisition and display circuit is used for displaying the concentration of the gas to be detected. Compared with other detection instruments, the laser infrared gas analyzer has the advantages that division operation is introduced into the intensity modulation and canceling circuit, and the laser infrared gas analyzer is combined with a space double-optical path differential detection method, so that the influence of the intensity modulation can be fundamentally canceled.

The invention provides a method and a device for measuring photosynthesis, breath and transpiration of a plant canopy or / and breath and evaporation of soil. The device is formed by assembling a box base, three boxes (a light box, a dark box and a bare box), a multichannel magnetic valve, an infrared gas analyzer, a data collector, a temperature sensor, a baroceptor and an air pump. The invention can be used for measuring population photosynthesis-breath-evaporation and breath-evaporation of various plants, such as farmland, lawns, bushes, and the like and observing photosynthesis, breath and transpiration of plants and breath and transpiration of soil at the same place and the same time, and can realize the continuous observation and scientific split of various components.

The related IR gas analyzer to on-line detect gas concentration comprises: a gas transmission device, an original-path reflector, a connection control box, a standard gas scaling unit, a gas cleaning device, and a SCM. With open-loop structure, this invention can change for different gas absorption feature, runs stably and accurately, and needs a little maintenance.

The invention discloses an air chamber for automatically measuring soil respiration, which belongs to the field of ecological research. The air chamber for automatic measurement of soil respiration is composed of an automatic opening device, a base, a measuring chamber and the like. It is driven by a small DC motor placed on the base to realize timing opening and closing during measurement. The measurement chamber consists of a hollow shell, which is divided into upper and lower parts. A temperature probe can be installed in the top center of the upper part of the shell to measure the temperature in the gas chamber. The two sides of the top inside the shell are provided with ventilation ports that communicate with the infrared gas analyzer. The upper part of the shell is equipped with a copper tube with holes; the lower part of the shell is buried in the soil, and the airtightness is realized by the plastic rubber ring when the upper and lower shells are closed; the air chamber for automatic measurement of soil respiration in the present invention can be used for infrared gas analysis. The instrument provides an analytical gas source to calculate the soil respiration rate; it can quickly provide multi-point measurements.

Methods, devices, and systems for measuring carbon assimilation based on simultaneous or near-simultaneous measurements of chlorophyll fluorescence and stomatal conductance of plant. A sample containing chlorophyll, such as a plant leaf, is illuminated with light, e.g., in the form of a single saturating pulse or multiple pulses, and chlorophyll fluorescence and stomatal conductance of the chlorophyll sample are measured. A porometer or infra-red gas analyzer is used to measure stomatal conductance and a photodetector is used to measure fluorescence. A carbon assimilation value for the chlorophyll sample is determined using the measured chlorophyll fluorescence and the measured stomatal conductance.

A system for displacing shale gas with CO2 and simulating and testing adsorption and desorption of shale to the shale gas or CO2 comprises a CO2 bottle and a CH4 bottle, the CO2 bottle is connected to the input end of a first piston container, the CH4 bottle is connected to the input end of a second piston container, the power driving ends of the first piston container and the second piston container are connected with a power driving system, the output ends of the first piston container and the second piston container are connected to the input end of a sand-filled tube, a connecting pipeline for connecting the output ends with the input end is provided with a vacuum pump and a calibration system, the sand-filled tube is arranged in a thermotank and is connected with an axial pressure pump, the output end is connected to a tail gas recovering bottle, and a pipeline for connecting the output end with the tail gas recovering bottle is provided with a back pressure control system and an infrared gas analyzer. The invention also provides a method based on the system. The system and the method can simulate and test the effect of displacement of the shale gas with CO2 in different states at different temperatures under different pressures; and an experiment device is used to carry out experiments of adsorption and desorption of the shale to CH4 or CO2 and research the gas adsorption and desorption rule of the shale at different temperatures under different pressures.

There are provided an infrared gas analyzer of a simple configuration, capable of taking measurements with high precision when using an infrared light source excellent in thermal responsiveness, and capable of ON / OFF operations at high speed, and an infrared gas analysis method using the same. The infrared gas analyzer having a sample cell into which a sample gas is distributed, for detecting concentration of a measuring target component of the sample gas by taking advantage of variation in absorption amount of infrared rays having passed through the sample cell, comprising a first infrared light source for irradiating the sample cell with first infrared rays, a second infrared light source having a response characteristic equal to that of the first infrared light source, a detector for detecting a difference between the first infrared rays emitted from the first infrared light source, and having passed through the sample cell, and second infrared rays emitted from the second infrared light source, a light source drive controller for synchronously driving the first and second infrared light sources, respectively, and a measurement controller for providing the light source drive controller with instructions for respective drive amounts of the first and second infrared light sources while receiving an output signal from the detector, thereby generating a measurement output corresponding to the concentration of the measuring target component of the sample gas.

The invention relates to an experimental method for determining reaction velocity of carbonate rock and hydrochloric acid in an acidification and fracturing laboratory and a research department. The method helps overcome discontinuity of periodic sampling of an acidification and fracturing experiment and test errors of titration method and enhance the test accuracy of acid and rock reaction velocity. The technical proposal is as follows: acid liquor is displaced from an intermediate container by a displacing fluid, preheated and sent to a double-rock plate type simulated crack reactor to react with rocks on a wall; the reaction product is cooled, filtered and sent to a gas-liquid separator, nitrogen gas is injected into the gas-liquid separator to separate carbon dioxide from the liquid, the mixed gas is discharged from the separator, and is subject to dehydrochlorination by distilled water, dehydration by phosphorus pentoxide and dehydration by concentrated sulfuric acid, and then an infrared gas analyzer is employed to determine the carbon dioxide content of the mixed gas, and the total flow rate, pressure and temperature of the mixed gas are also determined, and the reaction velocity is calculated by combing a state equation and a reaction formula The experimental method has the advantages of simple and convenient operation and higher accuracy, and can be used for determining the reaction velocity of the carbonate rock and the hydrochloric acid.

The invention provides an environment testing box for simulating a seriously-polluted atmosphere. The environment testing box comprises a photochemical smoke polluted environment simulation system and a detection system, wherein the photochemical smoke polluted environment simulation system comprises an upper-cold and lower-hot convection generation device, an ultraviolet lamp tube, a heat radiation plate, a carbon dioxide generator, a nitric oxide generator and a water vapor generation device; and the detection system comprises a sample rack, a multi-pipeline infrared gas analyzer and a temperature recorder which are arranged in the box body. Compared with the prior art, a generation condition of photochemical smoke in the seriously-polluted atmosphere can be stably simulated; the environment testing box can be stably operated for a long time, and a long-time corrosion and ageing test can be carried out on a material; a heat pump is used, and heating and refrigeration energy conservation can be realized; and the environment testing box is simple and convenient to maintain.

The invention provides a portable infrared gas analyzer with automatic range calibration, comprising a pretreatment unit, an analysis unit, a master monitoring unit, a standardization unit and a correction unit. The analysis unit comprises a light source, an absorbing gas chamber and a receiving gas chamber, the light source generates infrared light and the infrared light irradiates the interior of the absorbing gas chamber, the standardization unit performs zero correction and range standardization and transmits standardized gas into the receiving gas chamber, and the correction unit automatically corrects a sample gas concentration measurement adapter pipe by calculating offset increment caused by actual environment variation. The portable infrared gas analyzer can automatically correct measurement results, not only overcomes the influence of measurement environments on measurement and ensures system measurement precision, but also can analyze gas for long time without an extra pretreatment unit, has a cost-saving effect and is convenient to carry.

The invention discloses a gas-sampling chamber which is applied in infrared gas analysis instrument (or sensor) field, is capable of reducing the affect of dust and water vapour on measurement accuracy furthermost so as to improve measurement accuracy. The chamber structure comprises a cavity body which is provided with an opening that allows an inner cavity to be communicated with the outside and a window that beam can permeate, and is characterized in that the inner cavity of the sampling chamber is also provided with a device that is capable of blocking the reflection of beams, which can be realized by making the inner cavity wall more rough, making the inner cavity wall with material that absorbs infrared light intensely, painting substance that absorbs infrared light on the inner wall surface or arranging a reflected light blocking ring that can block reflected light from entering the infrared detector in the sampling chamber cavity body. Then the rate of the reflected light reaching the infrared detector is approximate to zero, thereby improving the anti-dust capability and the anti-water vapour interference capability of the infrared gas analysis instrument (or sensor).

The invention relates to the field of component detection, in particular to a digital signal processing and controlling system of a non-dispersive infrared gas analyzer. A digital signal processor (DSP) is used as a core of the digital signal processing and controlling system. The digital signal processing and controlling system comprises a DSP chip, an infrared signal conditioning circuit, a 24-bit analog-to-digital converter (ADC) circuit, a temperature acquiring circuit, a gas pressure acquiring circuit, a 16-bit ADC circuit, an external expansion static random access memory (SRAM) circuit, a ferroelectric memory circuit, a real-time clock circuit, a reset circuit with a watchdog and a power monitor, a thermal resistance driving circuit, a key circuit, a digital output circuit, an RS-232 / 485 interface, a liquid crystal display circuit, a 4-20mA / 0-20mA output circuit and software. The amplitude of signals is solved by a spectral analysis method based on fast Fourier transform (FFT), the center of gravity is corrected, the amplitude of the signals is measured accurately, and signal processing accuracy is guaranteed; a mathematical model which meets requirements on engineering application is set up, and the relation between input and output is non-linearly corrected; and temperatures are controlled by using a proportion-integration (PI) control algorithm based on pulse-width modulation (PWM).

An emitting source capable of radiating substantial energy in the near infrared spectrum and suitable for use in non-dispersive infrared gas analyzers or other devices is described. Operation can be steady state (DC) or pulsed at high frequency with excellent modulation characteristics. The device consists of a tungsten filament mounted across the pins of a small transistor outline header and centered at the focal point of a parabolic or other shaped reflector. The header assembly is enclosed by a resistance-welded cap and window assembly having a specially sealed sapphire or other suitable IR transmissive window. Fundamental to the operation of the inventive IR emitter is the incorporation of a getter within the header package configured to prevent oxidation degradation of the tungsten filament. An inert gas backfill limits filament evaporation and further extends apparatus lifetime.

An infrared gas analyzer includes a flow sensor placed in a gas flow channel in a state in which two heating resistors are kept with a given spacing. The infrared gas analyzer further includes a substrate having a flat plane placed in parallel with the gas flow direction of the gas flow channel and a hole made in the flat plane of the substrate. The gas flow channel is provided in parallel with one face of a detector. The two heating resistors placed with a predetermined spacing on the substrate across the hole orthogonally to the gas flow direction.

The invention discloses an organic carbon mineralized culture apparatus and a method for determining soil organic carbon mineralized rate by utilizing the apparatus without soil, and in particular relates to the culture apparatus and the method of determining soil organic carbon mineralized rate by utilizing the apparatus. According to the invention, the apparatus and the mehtod aim to solve the problems that the experimental error of culture apparatus is large, continuous sampling is difficult, and the test method only determines CO2 and does not determine CH4 in the existing alkali liquor absorption method, gas chromatography and infrared gas analyzer method. The culture apparatus consists of a biochemistry culture pin, a valve, a rubber stopper, a connecting pipe and a wild-mouth bottle. The method comprises the steps of taking the apparatus; preparing and collecting microorganism inoculation liquid and water-soluble organic carbon mother liquor; preparing a culture solution; assembling a sample device; assembling a blank device; cultivating; and determining. The experimental error of the apparatus provided by the invention is decreased to less than 5 percent; continuous sampling can be carried out. With the adoption of the method provided by the invention, rates of discharge of CO2 and CO4 can be determined at the same time. The apparatus and the method can be used to determine the soil organic carbon mineralized rate.

The invention discloses a device for sampling and analyzing a liquid. The device comprises an automatic sampler and a Fourier transform infrared gas analyzer, wherein the gas outlet and the gas inlet on the sampler are respectively connected with the gas inlet and the gas outlet of the Fourier transform infrared gas analyzer through guide tubes in a sealing manner to form an analytic system; and the sampler is used for extracting a water sample to be detected through a liquid sample inlet, the water sample is subjected to constant-temperature heating in the sampler, and volatilization gas in the water enters a gas analyzer to be analyzed. The invention relates to an analyzing device for carrying out automatic sampling on the liquid, and can realize rapid, simple and accurate analysis on volatile matters in water.

An infrared gas analyzer using photon crystal optical fiber as gas chamber consists of measuring path and reference path .It features that character of constraining transmission light by photon crystal optical fiber and character of its core layer being hollow are utilized separately to use hollow layer of photon crystal optical fiber directly as gas chamber to carry out measurement on reference gas and gas to be tested.

The invention discloses a continuous online emission monitoring system which comprises the components of a solid particle continuous monitoring subsystem, a gaseous pollutant continuous monitoring subsystem and an emission parameter continuous monitoring subsystem, wherein the solid particle continuous monitoring subsystem, the gaseous pollutant continuous monitoring subsystem and the emission parameter continuous monitoring subsystem are mounted in a chimney or a flue channel. The solid particle continuous monitoring subsystem, the gaseous pollutant continuous monitoring subsystem and the emission parameter continuous monitoring subsystem are connected with a data processing and remote communication system. The gaseous pollutant continuous monitoring subsystem comprises a sampling probe with a backflow function and a heating function, a trace heating tape, an emission preprocessing system and an infrared gas analyzer, wherein the sampling probe, the trace heating tape, the emission preprocessing system and the infrared gas analyzer are successively connected. Functions such as gas sampling, backflowing, dust filtering and water filtering in the gaseous pollutant continuous monitoring subsystem are controlled through a PLC control system. According to the continuous online emission monitoring system, through monitoring the solid particle, the gaseous pollutant and the emission parameter, by means of remote communication and a data acquisition unit, the continuous online emission monitoring system realizes advantages of remote fault diagnosis, strong software function, high flexibility in use, etc.

In order to improve a measurement accuracy of an EGR ratio and to downsize the device and to save labor, the EGR ratio measuring device comprises a pair of nondispersive infrared gas analyzers, that have a function of correcting a water influence and that can measure a concentration of CO2 in a gas containing water, an intake air introduction line that is connected to an intake air pipe of an internal combustion engine and that introduces a part of the intake air into one nondispersive infrared gas analyzer without removing the water, an exhaust gas introduction line that is connected to an exhaust gas pipe of the internal combustion engine and that introduces a part of the exhaust gas into the other nondispersive infrared gas analyzer without removing the water, and a temperature adjusting mechanism; that keeps a temperature of whole of the introduction lines, and a temperature of the nondispersive infrared gas analyzers, so as not to condense dew, and a configuration of the intake air introduction line including a flow channel length is set to be substantially the same as a configuration of the exhaust introduction line including a flow channel length.

The present invention provides a novel telescopic natural gas leak detection alarm. The novel telescopic natural gas leak detection alarm has the advantage of simple structure and convenient operation. The novel telescopic natural gas leak detection alarm comprises a shell and a base. The novel telescopic natural gas leak detection alarm is characterized in that a support A is arranged on the base; the support A is connected with a support B through a rotating device; a telescopic bracket is arranged in the support B; the telescopic bracket is connected with the shell; the front end of the shell is provided with a horn opening; an infrared gas analyzer and an alarm are arranged in the shell; a temperature sensor is arranged in the infrared gas analyzer; the infrared gas analyzer is electrically connected with the temperature sensor; the temperature sensor is electrically connected with a controller; and the controller is electrically connected with an alarm. The front end of the shell is provided with the horn opening, so that an aggregation effect can be realized when natural gas leaks; the support A is arranged on the base, and the support A is connected with the support B through the rotating device, and therefore, adjustment of the angle of the novel telescopic natural gas leak detection alarm can be facilitated; and the telescopic bracket is arranged in the support B, and the telescopic bracket is connected with the shell, and therefore, the use range of the novel telescopic natural gas leak detection alarm can be expanded.

An infrared gas analysis apparatus comprising an illuminating source, infrared source, chopper wheel, operating air room, subsidiary air chamber, electric motor, light cone, solid infrared detector and a display unit. The invention applies a subsidiary air chamber having single light source, double optical paths and four light beam arrangement, which can detect the split spectrum error at any time, achieving ultrastability for the analytical instrument.

The invention provides a portable device for determining vertical profile distribution of CO2 concentration in plant population, which consists of a gas collector, a gas circuit switcher, an air filter, an air pump, an infrared gas analyzer and a system support. The CO2 concentration in air at different levels is measured by switching gas circuits to obtain vertical profile distribution of the CO2 concentration in plant population. The device has the advantages of convenient movement, low fabrication cost, flexible and convenient use and accurate data obtained, and can be adjusted according to the height of target plants and measuring requirements, thus meeting the requirement of wild environment.

The invention discloses a gas detection method used for an infrared gas analyzer. The method comprises the following steps of: acquiring a flow difference signal measured by the infrared gas analyzer, and carrying out analog-to-digital conversion on the flow signal to obtain a digital flow difference signal; sequentially carrying out digital filtering, temperature compensating and pressure compensating on the flow difference signal to respectively eliminate interferences of interference component gases in a gas to be detected, ambient temperature and air pressure to obtain the flow difference signal; and carrying out nonlinear processing on the processed flow difference signal according to a Beer law, and calculating to obtain the concentration value of a measured component in the gas to be detected. By adopting the method disclosed by the invention, interferences of the interference component gases in the gas to be detected, the ambient temperature and the air pressure in the infrared gas analyzer can be effectively eliminated, drift error of hardware is compensated, and a high-accuracy concentration value of the measured component in the gas to be detected is obtained by calculation.

The invention relates to a trunk CO2 flux measurement device. The trunk CO2 flux measurement device comprises an infrared gas analyzer, a gas passage and a lifting frame used for arranging the infrared gas analyzer and the gas passage connected with the infrared gas analyzer, wherein the gas passage comprises a trunk contact cover, a carbon flux gas chamber contact cover and a steering tube used for connecting the trunk contact cover and the carbon flux gas chamber contact cover, the steering tube is arranged on the lifting frame through a fixing seat, the lifting frame comprises a desktop and desk legs located at the corners of the lower side of the desktop, each desk leg comprises a fixed segment and a telescopic segment located in the fixed segment, the fixed segment is connected with the telescopic segment through a locking device, a bearing platform is arranged between the desk legs, and a rail is arranged on the periphery of the bearing platform. According to the measurement device, the problem that a long-term test problem with high observation efficiency is difficult to carry out in a trunk breath process in the field for a long time is solved, the automation capability of plant trunk CO2 flux observation processes according to time scales such as day and night, seasonal variation and the like is greatly improved, manpower investment is lowered, and valuable data is provided for researches on trunk breath, carbon cycle of forest ecosystems, etc.

The invention relates to an infrared gas analyzer, and particularly discloses a portable infrared gas analyzer which comprises a pretreatment unit, a calibration unit, an analysis unit, and a control system; the analysis unit comprises an infrared light source, an analytic gas chamber, and a receiver; the infrared light source is disposed facing the receiver; the analytic gas chamber is disposed between the infrared light source and the receiver; the control system controls the running of the portable infrared gas analyzer, and calculates the concentration of the gas based on the attenuation degree of infrared signals received by the receiver. The invention integrates the pretreatment unit and the calibration unit, has a small volume, is portable, and can perform high-precision measurement and analysis of sample gas based on its infrared absorption characteristics; the calibration unit can realize the zero correction of the gas to be measured and the automatic calibration of the measurement range; the pretreatment unit can remove liquid components and particles in the gas to be measured, and can adjust the flow rate of the gas to be measured to a flow rate suitable for analysis.

The invention discloses an infrared gas analysis pretreatment system. The system comprises an electromagnetic valve, a condenser, a filter, a sampling pump and an infrared gas analyzer, wherein the electromagnetic valve is provided with a sample gas connector, an air connector and a condenser connector; one end of the condenser is connected with the electromagnetic valve via the condenser connector and the other end of the condenser is connected with one end of the sampling pump via the filter; the condenser is also provided with an outlet; and the other end of the sampling pump is connected with the infrared gas analyzer. By using the system provided by the invention, the same condensation treatment is carried out on the air and the sample gas so that the humidity of the air is similar to that of the sample gas, thus reducing the effect of the difference of the humidity of the air on the measuring results and improving the accuracy of the measuring results.

A photo-thermal power generation heat transfer and storage medium leakage detection system provided by the present invention comprises a tank body, a first pre-processing device, a gas chromatographic analyzer, a second pre-processing device, an infrared gas analyzer and an analysis monitoring module. The tank body is equipped with at least one air pressure balance valve, the first pre-processing device is used to pre-process a gas medium discharged by the air pressure balance valve and divides the pre-processed gas medium into two to send to the gas chromatographic analyzer and the infrared gas analyzer respectively, and the analysis monitoring module obtains the data detected by the gas chromatographic analyzer and the infrared gas analyzer, and displays, records and analyzes the detection data. According to the present invention, the tank body and a detection device are connected together in a detachable manner, thereby avoiding the direct damage to the tank body, reducing the fault links, and improving the maneuverability of the detection system.

The invention relates to an infrared gas concentration analyzer, which comprises a light emitting unit, a light receiving unit, a light input fiber, a light output fiber, a light coupler, a gas inlet fiber connector, a gas exit fiber connector, a central processing unit, a gas path fiber and a light reflecting device. The gas path fiber filed with testing gas forms a gas chamber which can improve length of the light path and reduce occupied space. The hollow gas path fiber and the light reflecting device form a fiber resonance cavity, in where the detecting light beam can transmit back and forth multiple times after being reflected by the light reflecting device and still transmit into the hollow gas path fiber which can improve the gas detection sensitivity.

Disclosed is an apparatus for measuring biodegradability of a polymer sample by non-dispersive infrared spectrometry, including a compression pump ( 2 ), a first air controlling unit ( 4 ), carbon dioxide removing devices ( 6 ), a filter ( 8 ), a first cooling device ( 10 ), at least two composting vessels ( 12 ), at least two second cooling devices ( 10 '), at least two second air controlling units ( 14 ), at least two non-dispersive infrared gas analyzers 16 and collection units ( 18 ), connected in order, and a computer ( 34 ) connected to the first air controlling unit, the second air controlling units and the gas analyzers. Using the current apparatus, the amount of carbon dioxide is rapidly, quantitatively and reproducibly measured, and the apparatus is thus used for research and development procedures of biodegradable polymers.

The invention discloses a portable Fourier transform infrared gas analyzer suitable for a field complex environment. The analyzer comprises a light source assembly, an interface sealing ring assemblyI, a cable group I, an angle mirror type Michelson interferometer and light path assembly, a power panel, a cable group II, an electrical mainboard, an interface sealing ring assembly II, an interfacesealing ring assembly III, a gas chamber, a battery, a gas pump and an electromagnetic valve; the light source assembly comprises a collimating mirror, an infrared light source and a third plane mirror; and the angle mirror type Michelson interferometer and light path assembly comprises a light transmitting window piece, a first plane mirror, a second plane mirror, a laser detector, a beam splitter, a fourth plane mirror, a first sealing window piece, a second sealing window piece, an infrared detector, an ellipsoidal mirror, a parabolic mirror, a movable mirror, a fixed mirror and a laser device. The gas chamber comprises a third sealing window piece, a first concave mirror, a second concave mirror, a third concave mirror and a fourth sealing window piece. Technical indexes and environmental applicability of the analyzer are superior to those of corresponding foreign products, and the analyzer can be popularized and used in vast areas of China.