22 results about "Photoionization detector" patented technology

The ionization chamber comprises a negative electrode and a positive electrode, the negative electrode and the positive electrode are arranged in an overlapped mode, an ultraviolet lamp is arranged on one side of the positive electrode or the negative electrode, the negative electrode and the positive electrode are each provided with an air flow channel communicated with each other, the ultraviolet lamp is located at the inner end of the air flow channel, and the ultraviolet lamp is located at the outer end of the air flow channel. A high-voltage structure is arranged on the edge of an airflow channel of the negative electrode or the positive electrode. The high-voltage structure is arranged on the edge of the gas flow channel of the negative electrode or the positive electrode, so that the high collection efficiency of VOCs gas molecule ionization products is ensured. According to the photoionization detector provided by the utility model, a high bias voltage does not need to be additionally applied to eliminate the noise influence, and a complex hardware circuit or a humidity compensation algorithm does not need to be additionally arranged, so that the manufacturing cost and the failure rate of the photoionization detector are favorably controlled, and the development, debugging and maintenance costs of enterprises are also favorably reduced.

A method for enhanced mud gas logging includes receiving a gas stream; separating the gas stream into a first gas stream, a second gas stream, and a third gas stream; directing the first gas stream to a gas chromatography configuration including a gas chromatography column and a photoionization detector; detecting, by the photoionization detector, gas species in the first gas stream; separating, by a first separation component, water vapor from the second gas stream to produce a processed second gas stream; detecting, by a first mass spectrometer, gas species in the processed second gas stream; separating, by a second separation component, water vapor and other gas species from the third gas stream to produce a processed third gas stream; and detecting, by a second mass spectrometer, gas species in the processed third gas stream.

The application discloses an ionization chamber of a photo-ionization detector, comprising a negative electrode and a positive electrode, the negative electrode and the positive electrode are arranged in an overlapping mode, an ultraviolet lamp is arranged on one side of the positive electrode or the negative electrode, the negative electrode and the positive electrode are both provided with airflow channels which are in communication with each other, the ultraviolet lamp is located at the inner end of the airflow channels, and the airflow channel edge of the negative electrode or the positive electrode is provided with a high-voltage structure. The high-voltage structure arranged at the airflow channel edge of the negative electrode or the positive electrode can ensure the high collection efficiency of the ionization product of VOCs gas molecules. Therefore, it is unnecessary to additionally apply a higher bias voltage to eliminate the noise influence, and it is also unnecessary to additionally set a complex hardware circuit or a humidity compensation algorithm, so that the manufacturing cost and the failure rate of the photo-ionization detector can be controlled, and the development, debugging and maintenance costs of enterprises can be reduced.

A method, apparatus, and computer program product for detecting volatile organic compounds (VOCs) in a gas is provided. An example VOC detector may include a processing device and a detecting region. The detecting region may further include a first interdigital pole electrically connected to a separation voltage source, a second interdigital pole electrically connected to a switch, and an ionization device configured to interact with the gas within the detecting region to create a plurality of ionized gas molecules. To facilitate detection of VOCs, the switch may alternate the connection of the second interdigital pole between a compensation voltage source and the processing device. The processing device may determine a number of volatile organic compounds in the gas based at least in part on a number of ionized gas molecules that contact the second interdigital pole while the second interdigital pole is electrically connected to the processing device.

The invention discloses a high-flux vacuum ultraviolet light source device, which belongs to the technical field of high-end analytical instrument components, and comprises a radio frequency power amplification excitation mechanism, a heat dissipation mechanism, a discharge medium gas circuit mechanism, a vacuum sealing mechanism and a light emitting mechanism, one end of the light-emitting mechanism is connected with the discharge medium gas circuit mechanism, the other end of the light-emitting mechanism is connected with the vacuum sealing mechanism, and a gas inlet pipe and a gas outlet pipe of the discharge medium gas circuit mechanism penetrate through the heat dissipation mechanism. The high-flux vacuum ultraviolet light source device has the advantages of being small in size, high in luminous flux, stable in output, long in service life and the like, and can be widely applied to the fields of mass spectrometry, spectral analysis, photoelectron spectroscopy analysis, chromatographic photoionization detectors, basic physical research and the like; and the requirement of a high-end analysis instrument on a high-performance vacuum ultraviolet light source is met.

The invention provides an ultraviolet lamp used in a photoionization detector, the ultraviolet lamp comprises a lamp tube, a metal sheet, a sealing layer and an ultraviolet light window sheet, the lamp tube is filled with inert working gas, the metal sheet is arranged on the inner wall of the lamp tube, the sealing layer is arranged on the inner wall of the lamp tube, and the ultraviolet light window sheet is arranged on the inner wall of the lamp tube. The sealing layer is connected between the lamp tube and the ultraviolet light window sheet so as to keep the air tightness of the interior of the lamp tube, and the ultraviolet light window sheet enables ultraviolet light generated by excitation of the inert working gas to penetrate through and output to the outside. According to the ultraviolet lamp, due to the arrangement of the metal sheets in the lamp tube, inert gas molecules in the ultraviolet lamp can be excited more quickly, so that the working state entering speed of the ultraviolet lamp is remarkably increased.

This utility model discloses a zeolite rotor device for efficiently treating organic waste gas from coating processes. The device includes a rotor box containing a zeolite rotor. An inlet pipe is fixedly installed at the front end of one side of the rotor box, and an outlet pipe is fixedly installed at the front end of the other side. A detection box is fixedly installed on one side of the outlet pipe, and a photoionization detector is fixedly installed above the detection box. An electric valve is fixedly installed at the front end of the detection box, and a connecting pipe is fixedly installed at the front end of the electric valve. An output pipe is fixedly installed at one end of the connecting pipe. An electric valve is fixedly installed at the rear end of the detection box, and a reflux pipe is fixedly installed at the rear end of the electric valve. This device achieves reflux treatment capability, increasing its practicality and solving the problem that a single pass through the zeolite rotor cannot stably remove organic matter from waste gas containing various types of organic matter or with high concentrations of organic matter.

The invention discloses a biomass derived porous material adsorbability testing method and a detection device, the detection device comprises a gas phase pipeline system, a liquid phase pipeline system and a flushing pipeline system, the gas phase pipeline system comprises a multi-way valve I, a gas storage tank, a gas circulating pump and a gas heater which are connected in sequence; the liquid phase pipeline system comprises a multi-way valve I, a liquid storage tank, an anti-corrosion circulating pump and a liquid heater which are connected in sequence, the flushing pipeline system comprises a multi-way valve I and a standard state flushing pipeline, and the reactor system comprises a multi-way valve II, a reactor, a detection instrument, an outlet valve and a photoionization detector which are connected in sequence. According to the invention, by integrating the multi-parameter working condition simulation module, the in-situ regeneration test module and the multi-channel parallel test module, the integrated test of static / dynamic adsorption, multi-parameter coupling, in-situ regeneration and cyclic verification is realized, the defects of simplification, fragmentation and poor scene adaptability of the existing equipment are overcome, and the detection accuracy and the detection efficiency are improved.

A method for enhanced mud gas logging includes receiving a gas stream; separating the gas stream into a first gas stream, a second gas stream, and a third gas stream; directing the first gas stream to a gas chromatography configuration including a gas chromatography column and a photoionization detector; detecting, by the photoionization detector, gas species in the first gas stream; separating, by a first separation component, water vapor from the second gas stream to produce a processed second gas stream; detecting, by a first mass spectrometer, gas species in the processed second gas stream; separating, by a second separation component, water vapor and other gas species from the third gas stream to produce a processed third gas stream; and detecting, by a second mass spectrometer, gas species in the processed third gas stream.

This invention discloses a self-cleaning variable optical path photoionization detector. By setting up a reinforcement structure, an optical path adjustment mechanism, and a self-cleaning mechanism, it achieves variable optical path based on ultraviolet lamp radiation. This greatly facilitates the applicability of the detector, thereby reducing the types of materials, procurement cycle, and detector cost. The variable optical path of the detector means a wider concentration detection range. One detector can be used in multiple scenarios without affecting the overall equipment size. The whole equipment does not need to be redesigned or compatible with different specifications of detectors. At the same time, the self-cleaning mechanism realizes the self-cleaning function, effectively reducing the equipment maintenance labor cost.

This invention discloses an intelligent refrigeration control system and refrigeration device for Chinese dishes, belonging to the technical field of refrigeration systems. Specifically, it includes: acquiring the temperature sequence of the heated surface and the medium during the cooking stage of the dish; extracting dissipation characteristic parameters and temperature rise parameters and mapping them to fluctuation amplitude, heating duration, and fluctuation period to construct an initial fluctuation condition and obtain a historical attenuation duration reference range; during the refrigeration process, collecting the gas response value sequence through a photoionization detector and determining the dissipation inflection point to obtain the measured attenuation duration; comparing the measured attenuation duration with the reference range and adjusting the fluctuation condition parameters in reverse according to the deviation to control the operation of the refrigeration system. This invention realizes the parameter transfer and closed-loop feedback adjustment from cooking thermal characteristics to refrigeration temperature fluctuation control.

The invention provides a water-gas dual-purpose halogenated olefin sensor, and relates to the technical field of analytical chemistry instruments, the water-gas dual-purpose halogenated olefin sensor comprises a carrier gas pipeline, a clustered membrane in-situ extraction sampling device, a cold trap dehydration device, a gas sample pipeline and a photoionization detector, the clustered membrane in-situ extraction sampling device is connected with the cold trap dehydration device through a conveying pipeline; the clustered membrane in-situ extraction sampling device comprises a container and a membrane sampling device, a liquid sample is contained in the container, the membrane sampling device comprises a clustered membrane, and halogenated olefin in water is extracted into a gas phase; the cold trap dehydration device is used for dehumidifying the gas conveyed in the conveying pipeline to obtain a low-humidity halogenated olefin-containing gas sample, and the low-humidity halogenated olefin-containing gas sample is sent into the photoionization detector for detection through the capillary column; and the gas sample pipeline is directly connected with the ionization detector. The water-gas dual-purpose halogenated olefin sensor disclosed by the invention is high in sensitivity, solves the problems of humidity interference, poor membrane stability and the like, and is suitable for detecting halogenated olefin in underground water.

A photo ionization detector (PID) is disclosed. The PID includes a PID lamp having a body and a magnesium fluoride window at an upper end of the body, and a drive electrode surrounding the body of the PID lamp and positioned below the magnesium fluoride window. Further, the drive electrode has elastic properties and thus applies an upward biasing force toward the magnesium fluoride window to maintain a predefined distance between the PID lamp and the signal collection component of the PID.

The invention relates to a gas detection circuit and a photoionization detector, and the circuit comprises a photoion signal amplification module which carries out primary amplification processing on a gas signal; at least two input ends of the signal processing module are respectively connected with the output end of the photoion signal amplification module; the signal processing module is used for carrying out non-attenuation amplification processing on the gas signal in a first preset measuring range and carrying out attenuation amplification on the gas signal in a second preset measuring range so as to expand the measuring range; wherein the upper bound of the first preset range is smaller than or equal to the lower bound of the second preset range; the signal restoration module is respectively connected with at least two output ends of the signal processing module; and the signal reduction module is used for reducing the gas signal processed by the signal processing module so as to output a detection result of the photoionization gas. Therefore, the application range of the photoionization gas detection circuit in various application scenes can be expanded.

A leak detection system includes a chamber support including a chamber supported by a frame. A trace gas supply supplies a trace gas mixture to a first volume defined between the chamber and a test part. A test part support includes an adapter supported by a frame and configured to mate with the test part and to define a second volume between the test part and the adapter. A seal plate surrounds the adapter and seals with the chamber. One or more inlets are in fluid communication with the second volume. N outlets are in fluid communication with the second volume. N fans create a second vacuum pressure in the second volume, supply gas to the one or more inlets and receive gas from a respective one of the N outlets. N gas sensors sense trace gas in the gas received from a respective one of the N outlets.

A photoionization detector sensor comprised of plate, at least one opening in the plate for UV light to pass through, and at least one electrically conductive pattern on at least one of the top and bottom surfaces of the plate. The at least one electrically conductive pattern can include a negative electrical potential pattern comprised of a first material. Further, the negative electrical potential pattern can have a void in its center, and the void can surround the at least one opening. The plate can be comprised of a second material that is different than the first material. The negative electrical potential pattern can be located on at least one of the top or the bottom surfaces, and the at least one electrically conductive pattern can further include an electron collecting electrode pattern on the other of top or bottom surface.

A photoionization detector sensor comprised of a plate having top and bottom surfaces and an electrically insulating substrate; at least one opening in the plate for UV light to pass through; a negative electrical potential pattern on at least one of the top and bottom surfaces; and an electron collecting electrode pattern having a wire suspended across the at least one opening. The negative electrical potential pattern includes a linear portion and a polarization plate. The electron collecting electrode pattern further includes a linear portion on the surface opposite the wire. The electrically conductive patterns can further include a grounded potential conductive pattern having a first portion on the top surface and a second portion on the bottom surface.

The present invention provides an ultraviolet lamp for use in a photoionization detector. The ultraviolet lamp comprises a lamp tube, metal pieces, a sealing layer, and an ultraviolet light window sheet, wherein the lamp tube is filled with an inert working gas, the metal pieces are disposed on the inner wall of the lamp tube, the sealing layer is connected between the lamp tube and the ultraviolet light window sheet so as to maintain the airtightness inside the lamp tube, and the ultraviolet light window sheet allows ultraviolet light, which is generated under the excitation of the inert working gas, to be transmitted and output to the outside. Due to the provision of the metal pieces inside the lamp tube, the ultraviolet lamp helps inert gas molecules therein to be excited more quickly, such that the speed of the ultraviolet lamp entering a working state is significantly increased.

An example photoionization detector is provided. The example photoionization detector includes an insulation spacer component and a signal collection electrode component disposed on the first surface of the insulation spacer component. In some examples, the signal collection electrode component includes a first electrode layer and a second electrode layer.

The utility model discloses an air conditioner, and belongs to the technical field of air conditioners. The air conditioner comprises an indoor unit comprising an indoor heat exchanger; the outdoor unit comprises a compressor and an outdoor heat exchanger; the refrigerant circulation loop enables a refrigerant to circulate in a loop formed by the compressor, the condenser and the evaporator in sequence; one of the condenser and the evaporator is an outdoor heat exchanger, and the other is an indoor heat exchanger; the fire extinguishing device comprises a photoionization detector used for detecting oil in the refrigerant leaked from the refrigerant circulation loop in real time; the fire extinguisher is connected to the refrigerant pipe of the refrigerant circulation loop through a conveying pipe, and a fire extinguishing electromagnetic valve is arranged on the conveying pipe; the electromagnetic valve assembly is arranged on the refrigerant circulation loop and used for connecting or disconnecting a refrigerant flowing path between the indoor unit and the outdoor unit. The photoionization detector is adopted, the existence of fire risk substances can be rapidly detected in the early stage of refrigerant leakage, and the fire extinguisher is used for retarding flame, so that the fire is rapidly prevented or eliminated.

An example photoionization detector is provided. The example photoionization detector includes an insulation spacer component and a signal collection electrode component disposed on the first surface of the insulation spacer component. In some examples, the signal collection electrode component includes a first electrode layer and a second electrode layer.