106 results about "Photoionization" patented technology

The invention discloses a GIS (Gas Insulated Switchgear) tiny defect detection method and system based on X-ray multi-effect fusion, and the method comprises the following steps: firstly, exciting a latent defect in a GIS to generate partial discharge by using an X-ray photoionization effect, detecting a discharge signal by using an ultrahigh frequency method and an ultrasonic method, and after the discharge signal is processed by a noise reduction model, carrying out noise reduction on the discharge signal; and respectively obtaining an ultrahigh-frequency discharge phase spectrogram and an ultrasonic discharge phase spectrogram. Then, the imaging plate is placed on the back face of the GIS, digital DR imaging is carried out through X rays, and an X-ray image is obtained; the ultrahigh frequency discharge phase spectrogram and the ultrasonic discharge phase spectrogram are fused after being denoised, an X-ray image is combined to establish a GIS health state diagnosis model, and reliable defect detection is carried out on the GIS according to the evaluation score of the diagnosis model. According to the method, multiple effects of X-rays are fused, so that smaller GIS latent defects can be found, the detection sensitivity is remarkably improved, and the problem that the traditional method is difficult to identify the tiny latent defects is solved.

The invention discloses a method for simulating partial discharge in a GIS (Gas Insulated Switchgear) under X-ray excitation. The method comprises the following steps: calculating initial electric field distribution in the GIS in simulation software; importing the initial electric field distribution into an MATLAB model, defining each simulation parameter, and obtaining an initial effective electron generation rate in the SF6 gas in the GIS and a photoelectron rate generated under the action of X-ray photoionization; whether partial discharge is generated or not is judged according to the internal electric field intensity of the GIS and the generated electron rate, conduction attenuation of charges in SF6 gas is simulated, and the numerical value change process of charged particles is described; after partial discharge is generated, the charge quantity of partial discharge and the discharge repetition rate are output; according to the method, the change of electrons in the partial discharge process is quantitatively described through a mathematical expression, the generation of partial discharge is judged according to two characteristic quantities, namely the electric field intensity and the number of electrons, and the obtained partial discharge quantity and the discharge repetition rate are close to those of actual discharge.

The invention discloses a composite ion source device for coupling atmospheric pressure interface orbitrap mass spectrometry, which belongs to the field of mass spectrometry detection and comprises a photo ionization / photo-induced association ionization ionization and ion transmission mechanism, a gas sample introduction mechanism, a high-flux radio frequency vacuum ultraviolet light source mechanism and an ion source and mass spectrometry interface mechanism. By adopting the composite ion source device for coupling the atmospheric pressure interface orbitrap mass spectrum, organic components with different polarities, ionization energy and ion affinity in a complex mixture can be efficiently ionized, and through reasonable structural design, the organic components are coupled with the high-resolution orbitrap mass spectrum with the atmospheric pressure interface, so that the high-resolution orbitrap mass spectrum is obtained. The detection range of complex organic components is widened, and the resolution capability and the detection sensitivity of low-abundance or high-molecular-weight organic components are improved.

The invention relates to a method for detecting ammonia exhaled by a nasal cavity, and belongs to the technical field of chemical analysis and detection. The method comprises the following specific steps: preparing standard gases of expiratory ammonia with different concentrations, sampling the standard gases into an ion mobility spectrometer, and sequentially detecting the standard gases to obtain quantitative standard curves with different concentrations; the method comprises the following steps: directly sampling exhaled air of the nasal cavity into an ion mobility spectrometry, obtaining an ion mobility spectrometry of a to-be-detected sample in real time, tracking a change curve of exhaled air ammonia signal intensity in real time, judging the ammonia of the nasal cavity at an exhaling end, obtaining a quantitative factor of the exhaled air ammonia of the nasal cavity, and calculating the ammonia concentration of the exhaled air ammonia of the nasal cavity according to a quantitative curve of the exhaled air ammonia of the nasal cavity. By adopting a direct photoionization single photon ion mobility spectrometry online detection technology, the method has very high sensitivity and specific signal response to low-concentration ppbv ammonia in human nasal exhaled gas, the concentration of ammonia in nasal exhaled gas can be monitored in real time, an effective detection method is provided for monitoring functions of organs such as liver and kidney, and the method is suitable for popularization and application. And life health is protected.

The utility model provides a photoionization gas sensor and a portable photoionization gas detector, the photoionization gas sensor is characterized in that an upper gas chamber cover, an electrode circuit board, a lower gas chamber cover, a switching circuit board and an ultraviolet lampshade are fixedly connected through conductive bolts to form a closed cavity, and the ultraviolet lampshade is fixedly connected with an ionization chamber; meanwhile, the conductive bolts can serve as wires to be connected with a collecting electrode on the electrode circuit board and the control circuit board, so that the space is saved, and the electrical connection is more stable; the control circuit board is electrically connected with the conductive bolt and the ultraviolet lamp control panel by using the FPC flexible flat cable, so that the complexity of electrical connection is further reduced; meanwhile, the gas passage is arranged from top to bottom, so that the space of the ionization chamber can be utilized to the maximum extent, the irradiation area is increased while the ultraviolet lamp is prevented from irradiating the collecting electrode, the gas reaction is more sufficient, and the detection efficiency is further improved.

The invention discloses a multi-parameter sensor system for monitoring the environment of a Maotai-flavor liquor production workshop, and the system comprises a plurality of intelligent sensor cabinets which are disposed in a distributed manner, are disposed in different process links of the liquor production workshop, and are used for collecting and preprocessing environment data; and the data service management platform is in communication connection with the plurality of intelligent sensor cabinets and is used for receiving, storing, fusing and analyzing the data from the intelligent sensor cabinets and performing visual display. Through high integration of various principles (such as electrochemical, infrared and PID photoionization) sensors, the PID photoionization sensor and various electrochemical and physical sensors are creatively integrated into single equipment, high-precision and total-factor monitoring of more than 20 brewing key environment parameters such as temperature and humidity, TVOC, ethanol, hydrogen sulfide and PM2.5 is realized, the monitoring dimension is comprehensive, the precision is high, and the monitoring cost is low. The perception capability on the change of the workshop microenvironment is obviously improved, and a solid data support is provided for the optimization of a precise brewing process.

The invention relates to an atmospheric pressure photo ionization rapid desolventizing device and method, and the device comprises a sampling valve which is installed on a sampling pipe of a high-pressure reactor and can be opened and closed according to a preset frequency; the atomizing unit is mounted on the sampling pipe at the downstream of the sampling valve and is used for atomizing a sample solvent; an inlet of the laval spray pipe is connected with an outlet of the sampling pipe, and an outlet of the laval spray pipe is led to a normal-pressure photo ionization area, so that a solvent is subjected to flash evaporation removal, and a product flows to the photo ionization area to realize ionization; wherein the Laval nozzle is provided with a temperature control system which is used for controlling the temperature of the Laval nozzle. According to the method, the solvent can be quickly removed, the integrity of thermal instability components is ensured, and the analysis accuracy is improved.

The present application relates to a kind of photoionization ion mobility spectrometry of fast switching combination reagent ion, including photoionization ion mobility spectrometry, reagent ion generation device, reagent molecule carrier gas is introduced to reagent molecule into the reaction zone of ion mobility spectrometry, different types of reagent ions can be obtained by switching different gas paths and reagent molecules in positive ion mode, and the reagent ions in conventional gas flow mode are mainly (C3H6O)2H + , after switching combination gas path device, new hydrate cluster reagent ion H3O (H2O) n + Is generated by the regulation of acetone and water reagent molecule, and the reactivity is higher, the sensitivity of target detection is higher, so that by switching different gas paths, the high sensitivity and high selectivity detection of target compound can be realized, such as the detection of exhaled air ammonia and atmospheric ammonia in complex matrix background, and any sample pretreatment process is not needed.

The utility model provides a water sample odor monitoring device. The water sample odor monitoring device comprises a heating module, an observation container, a gas freezing dryer and an enrichment detection chamber, the heating module is provided with a water inlet and a water outlet, the water outlet is connected with an observation container, the upper part of the observation container is provided with a gas outlet, the gas outlet is communicated with a gas inlet of a gas freezing dryer, a gas outlet of the gas freezing dryer is communicated with the enrichment detection chamber, the enrichment detection chamber is provided with a photoion PID sensor, and the photoion PID sensor is connected with the observation container. And the photoion PID sensor is in communication connection with the control module. By adopting the technical scheme of the utility model, the online real-time monitoring of the odor of the water sample is realized, the timeliness of water quality monitoring is improved, and the odor of the factory water is ensured to meet the requirements of the new national standard of water quality and the Shenzhen landmark.

This invention discloses a miniaturized portable mass spectrometer based on a vacuum ultraviolet photoionization source and its analytical method, relating to the field of mass spectrometry analysis technology. The mass spectrometer includes: a sample introduction and pre-screening module, consisting of a sample introduction system and an intelligent sample pre-screening unit. The sample introduction system enables gas-liquid sample switching. The pre-screening unit collects data through physical and chemical characteristic detection subunits, and outputs target compound type and parameter adjustment instructions after processing by a data analysis subunit. This invention, through the intelligent sample pre-screening unit in the sample introduction and pre-screening module, utilizes physical and chemical characteristic detection subunits to quickly acquire physicochemical characteristic data such as the color spectrum, volatile components, and pH value of the sample. The compound type recognition model built into the data analysis subunit can automatically compare with the sample characteristic database, quickly identify the target compound type, and generate ionization source parameter adjustment instructions, greatly simplifying the operation process and reducing detection time.

The present invention discloses an ion mobility spectrometry device using a dual-window ultraviolet lamp for ionization, which relates to the technical field of ion mobility spectrometry. The ionization source of the ion mobility spectrometry device is a dual-window ultraviolet lamp, and the dual-window ultraviolet lamp includes: a glass tube, a first ultraviolet window, a second ultraviolet window, and an excitation electrode. The first ultraviolet window and the second ultraviolet window are respectively arranged at both ends of the glass tube. The glass tube is filled with a working gas, and the excitation electrode is arranged on the outer wall of the glass tube. This solution realizes simultaneous photoionization of the analyte while only using one ultraviolet light source. The light intensities of the two ultraviolet windows can be synchronously kept consistent, improving the correlation of positive and negative ion mobility spectrometry, ensuring that the ionization efficiencies on both sides are close, and reducing the occupation of the lamp body on the volume of the ion mobility spectrometry device. And because only one lamp is driven, the energy consumption is reduced, and a set of drive circuits is reduced, reducing the necessary volume and weight of the device from the lamp and the circuit.

The present invention relates to a method for highly sensitive in-situ detection of reaction transient intermediates under high pressure, including sampling: obtaining intermediate products and target products in a high-pressure reaction chamber under a pressure difference to obtain a particle beam to be analyzed; photoionization: irradiating the particle beam to be analyzed with extreme ultraviolet light to cause photoionization of the particle beam to be analyzed, obtaining detectable charged ions; mass spectrometry analysis: performing mass spectrometry analysis on the charged ions obtained by photoionization, and obtaining a reaction mechanism according to the mass spectrometry analysis results; the photoionization and the mass spectrometry analysis are both carried out under the condition that the vacuum degree is ≤1×10<supgt;‑8< / supgt; Torr. An apparatus for implementing the method is also disclosed. Compared with traditional methods, the present invention can deeply understand the actual catalytic reaction mechanism and provide a scientific basis for improving the performance of catalysts. The present invention can achieve in-situ characterization of catalytic reactions under normal pressure or even a certain pressure.

The present invention discloses a composite ion source device for coupling an atmospheric pressure interface orbital trap mass spectrometer, belonging to the field of mass spectrometry detection, and comprising a photoionization / photoinduced association ionization and ion transmission mechanism, a gas sampling mechanism, a high-throughput radio frequency vacuum ultraviolet light source mechanism, and an ion source and mass spectrometer interface mechanism. The present invention adopts the above-mentioned composite ion source device for coupling an atmospheric pressure interface orbital trap mass spectrometer, so that organic components of different polarities, ionization energies, and ion affinities in complex mixtures can be efficiently ionized. Through reasonable structural design, the device is coupled with a high-resolution orbital trap mass spectrometer with an atmospheric pressure interface to achieve a broadened detection range of complex organic components and improve the resolution and detection sensitivity of low-abundance or high-molecular-weight organic components.

The application discloses a photoionization and discharge ionization combined ion source. After sample molecules are photoionized, the sample molecules are focused through an ion transmission hexapole, and the peak-to-peak value of a radio frequency voltage applied to the ion transmission hexapole is increased, so that discharge ionization is introduced between the ion transmission hexapole and an open electrode. Sample molecules which are not photoionized can be continuously subjected to discharge ionization, so that the signal strength and sensitivity are improved. Meanwhile, the discharge ionization has high energy, can ionize substances which cannot be ionized by photoionization, and widens the application range of the ion source.

The present invention relates to a method for determining the impulse discharge voltage during a ball-plate gap operation. The method comprises: obtaining an estimated voltage value; adjusting the estimated voltage value and applying it to the high-voltage electrode of the ball-plate gap model until the total number of electrons generated after the adjustment satisfies a first preset condition, thereby obtaining a first voltage value; determining the effective number of electrons based on waveform parameters and the first voltage value, wherein the waveform parameters are parameters of the voltage waveform formed by applying the ball-plate gap model and are determined based on the first voltage value; and adjusting the first voltage value until the effective number of electrons satisfies a second preset condition, thereby determining the impulse discharge voltage during the ball-plate gap operation. Based on the physical process of corona initiation and taking into account spatial photoionization, the present invention efficiently and quickly determines the impulse discharge voltage during a ball-plate gap operation, reduces the number of testers, and provides a basis for refined external insulation design.

The invention relates to the technical field of mass spectrum analyzers, in particular to an orthogonal electrochemical mass spectrum device. Comprising a photoionization system, an electron ionization system and an electrochemical reaction tank, the electrochemical reaction tank is sequentially connected with the photoionization system and the electron ionization system through a vacuum sampling pipe, and the photoionization system ionizes volatile organic compound gas generated in the electrochemical reaction tank to obtain a soft ionization spectrogram of the volatile organic compound gas; the electron ionization system is used for ionizing inorganic components generated in the electrochemical reaction tank to obtain an inorganic component mass spectrum. The photoionization source and the electron ionization source are ingeniously and orthogonally combined, soft ionization of volatile organic compounds and effective ionization of high-ionization-energy inorganic compounds in the electrochemical process can be achieved at the same time, and therefore the real-time concentration change trend of the volatile organic compounds and inorganic compounds is obtained.

The application discloses a kind of gas-phase pollutant full-species high-sensitivity online mass spectrometer and detection method, it is related to mass spectrometry technical development technical field.Mass spectrometer includes high-energy photoionization ion source structure, ion transmission structure and mass spectrum detection structure.High-energy photoionization ion source structure includes high-energy photon generation structure, sample introduction tube and ionization chamber, high-energy photon generation structure utilizes neon discharge to generate high-energy photon, high-energy photon is mixed with the gas to be measured that enters through sample introduction tube in ionization chamber, and the gas to be measured is ionized;Ion transmission structure is equipped with radio frequency quadrupole rod, for filtering the large amount of N2 + And O2 + Non-target background ions generated when measuring air;Mass spectrum detection structure is equipped with pulse-compensation double-electrode ion removal device, for further removing non-target background ions, relieving the measurement saturation and loss of ion detector.The application can realize the full coverage high-sensitivity detection of all gas-phase organic and inorganic pollutants in atmosphere.

The invention discloses a mass spectrum photoionization source based on a microstructure folding mirror, which comprises a first reflector and a second reflector, and the first reflector and the second reflector are oppositely arranged and are spaced by a preset distance to form a photoionization area; the surface of the first reflecting mirror and the surface of the second reflecting mirror are composed of a plurality of micro inclined planes, the sizes of the micro inclined planes are millimeter-to-submillimeter magnitude, and the micro inclined planes are irregularly arranged to form a micro folded plane array, so that incident light can be reflected back and forth between the first reflecting mirror and the second reflecting mirror to form light beams in multiple directions; therefore, the collision frequency of light and gas molecules is increased, and the ionization efficiency is improved.

The invention discloses an anti-pollution vacuum ultraviolet ionization coating method and device, and the method comprises the following steps: installing a target material and a reflector column in a cavity, and adjusting the size of a slit of a slit baffle plate between the reflector column and a part rack; according to the method, the cavity is vacuumized, an ultraviolet light source is turned on, gas-phase particles in the vacuum coating cavity are guided into the vacuum coating cavity through a specific light path, and the gas-phase particles in the vacuum coating cavity are subjected to photoionization to form ions, so that the ionization rate is increased, and the vacuum coating process with the adjustable ionization rate is realized; according to the invention, the ultraviolet light is reflected into the cavity of the vacuum coating through the reflector, and the ultraviolet light source is isolated from the working area of the vacuum coating, so that the problem that the reflection efficiency of the ultraviolet light is reduced due to the fact that light path assemblies such as the ultraviolet reflector are polluted by the vacuum coating in the working process is effectively solved; and meanwhile, the bombardment area of the ultraviolet light beam on the surface of the gas-phase particles or the solid-phase target material is increased through convex surface reflection, and the photoelectric ionization and vacuum coating efficiency is improved.

The present invention relates to a mass spectrometry analysis device for in-situ gas-solid phase photocatalytic reaction, and relates to the technical field of mass spectrometry analysis. It includes a photoionization time-of-flight mass spectrometry device and an in-situ photocatalytic reactor, which are connected by a differential chamber. The in-situ photocatalytic reactor includes a catalyst placement mechanism, a reaction light source, an inlet pipe and an outlet pipe; the improved catalyst placement mechanism includes a flat fixed bed and a hollow closed plate-shaped housing, both of which are made of quartz material; the reaction light source is located above the plate-shaped housing, and the light-emitting surface corresponds to the working surface of the fixed bed; one side edge of the plate-shaped housing is connected to the inlet pipe, and the other side edge is connected to the outlet pipe, and a sand core is provided in the outlet pipe. The present invention realizes more in-situ sampling of gas-phase intermediates, ultra-fast capture, is more conducive to the desorption of gas-phase intermediates under low pressure, and the molecular beam can "cool" gas-phase molecules, which is very suitable for studying the reaction mechanism of gas-phase intermediates through gas-solid phase photocatalytic reaction, and then guiding the synthesis of catalysts.

The invention discloses a method for reducing the matrix effect of a photoionization ion mobility spectrometry detection complex sample, and the ion mobility spectrometry comprises an ion migration tube with good air tightness, a photoionization source and an ion receiving electrode which are respectively and oppositely arranged at the left end and the right end of the ion migration tube, and an ion gate located between the photoionization source and the ion receiving electrode. The area between the photoionization source and the ion gate is an ionization area, and the area between the ion gate and the ion receiving electrode is a migration area. According to the method, the air pressure in an ion migration tube is maintained within the range of 10-80 kPa, meanwhile, an isolation high-voltage power supply connected with an ionization region is adjusted, and the electric field in the ionization region is maintained within the range of 300-600 V / cm, so that the charge transfer and proton transfer plasma-molecule reaction of ionized complex target compound ions in the ionization region is inhibited, and the target compound ions can be effectively separated from the ion migration tube. Therefore, the influence of a complex matrix on accurate quantification of the ion mobility spectrometry and detection of a low-proton-affinity or high-ionization-energy target compound can be eliminated.

The invention discloses a flow tube photoionization mass spectrometry device capable of maintaining a constant-temperature sample introduction environment, which comprises a quartz flow tube, a reaction cabin and a mass spectrometry mechanism, a reaction chamber is arranged in the reaction cabin, an outlet of the quartz flow tube is connected with a reaction chamber inlet of the reaction cabin, an inlet of the mass spectrometry mechanism is connected with a reaction chamber outlet of the reaction cabin, and the quartz flow tube is connected with the reaction chamber inlet of the reaction cabin. A sealing tee joint is arranged at an inlet of the quartz flow tube, an outlet of the sealing tee joint is connected with the inlet of the quartz flow tube, a quartz sample introduction boat is arranged at a first inlet of the sealing tee joint, a gas tube used for introducing target gas is connected to a second inlet of the sealing tee joint, and a special-shaped quartz tube is arranged outside one side, close to the reaction cabin, of the quartz flow tube in a sleeving manner; a heating wire is arranged outside one side, close to the reaction cabin, of the special-shaped quartz tube. The problem that the sample injection concentration of a solid sample is unstable during an experiment can be solved, and free radicals and intermediates formed in the reaction process can be detected by mass spectrometry. Meanwhile, the experiment environment can be adjusted according to experiment requirements, and experiment accuracy is guaranteed.

The invention belongs to the field of mass spectrum ionization, and particularly relates to a photoinduced Penning ionization mass spectrum method. Photoelectrons generated by a photoelectric effect accelerate in an electric field to obtain enough energy, helium He, neon Ne and argon Ar in ground states are excited to metastable states, and the energy of the metastable states of the neutral atoms is higher than 10.6 eV (He excitation energy is 20.62 eV and 19.82 eV); the excitation energy of Ne is 16.72 eV, and the excitation energy of Ne is 16.62 eV; the excitation energy of Ar is 11.72 eV and 11.55 eV), sample molecules with ionization energy higher than photon energy and incapable of being ionized by traditional photoionization can be ionized through Penning ionization, so that the reduction of mass spectrum resolution, sensitivity and quantitative capacity caused by a space charge effect caused by coulomb repulsion among too strong reagent ions in an ion transmission process is avoided, and the detection sensitivity is improved. And damage of too strong reagent ions to the ion detector. The sensitivity can be improved by about 5 times for sample molecules ionized by traditional photo ionization energy, such as toluene, with ionization energy lower than photon energy.

The invention discloses an in-vitro unknown drug photoionization mass spectrometry rapid qualitative analysis method, which comprises: S1, dissolving a captured suspected drug sample in an acetone or methanol solution, taking out the supernatant, and transferring into a sample bottle; s2, selecting a polar or non-polar SPME probe to penetrate through the sample bottle isolation pad to be inserted into the sample bottle isolation pad, and extracting; and S3, inserting the probe tube into the sample inlet, pushing the handle rod, extending out of the probe extraction head, and performing thermal desorption to desorb the sample to be detected and enter a mass spectrum ionization area. According to the method, richer ionized ion fragment information and molecular ions are provided in the rapid qualitative analysis and accurate identification process of on-site investigation of drugs and precursor chemicals by using a miniaturized mass spectrum technology, and molecular structure information can be provided for analyzing chemical components of unknown novel drugs by using a compound mass spectrum library.

The invention relates to an ion mobility spectrometry for switching ion types of a photo ionization reagent by controlling air pressure. The ion mobility spectrometry comprises a photo ionization ion mobility spectrometry, a reagent ion generating device and an air pressure control device, reagent molecule acetone is brought into the ionization area through carrier gas after being volatilized in a reagent bottle in a headspace mode, a mechanical pump is externally connected to a tail gas outlet of the migration tube so as to reduce the working air pressure in the migration tube, the reading is read through a barometer, and the content of carbon dioxide in the migration tube and the collision probability between ions are reduced. At normal pressure, the main reagent ion in the negative ion mode is CO3-(H2O) n, and at low pressure, the generation of CO3-(H2O) n is inhibited, and the main reagent ion is O2-(H2O) n. O2-(H2O) n is an active ion in a photoionization system, so that the reaction activity can be enhanced, and the detection sensitivity of target product ions, such as methyl salicylate, which is only subjected to an addition reaction with O2-(H2O) n so as to be ionized, is greatly improved. In addition, the method only needs to be externally connected with a mechanical pump to realize pneumatic control, is simple to operate, and does not need to reprocess and design the mobility spectrometry. And the air pressure is changed, so that a relatively high response speed can be realized, and the purpose of quickly switching main reagent ions in a negative ion mode is achieved.

This invention discloses an electrospray extraction / photoionization composite ion source for atmospheric pressure interface mass spectrometry, belonging to the field of mass spectrometry detection. It includes a sample transport and ionization mechanism, an extraction electrospray mechanism, and a vacuum ultraviolet light source mechanism. The extraction electrospray mechanism is fixedly connected to the sample transport and ionization mechanism, and the sample transport and ionization mechanism is fixedly connected to the vacuum ultraviolet light source mechanism. This invention utilizes the aforementioned electrospray extraction / photoionization composite ion source for atmospheric pressure interface mass spectrometry, enabling efficient ionization of gaseous and particulate organic components of different polarities, volatility, and molecular weights in the air. Through a reasonable structural design, it can operate under atmospheric pressure conditions, achieving the purpose of coupling with atmospheric pressure interface mass spectrometry.

The invention relates to the technical field of electronic information, and discloses a CT three-dimensional reconstruction coordinate-assisted mass spectrum imaging method and system, and the method comprises the steps: obtaining scanning data of a to-be-detected sample, and reconstructing a three-dimensional digital model; based on the three-dimensional digital model, planning sampling points on the surface of the sample, a laser desorption path and a sample attitude angle at each sampling point; controlling the sample to move according to the laser desorption path, so that when each sampling point on the sample reaches a laser beam focus of the normal-pressure laser desorption / secondary photoionization device, desorbing the surface of the sample at the sampling point at the planned sample attitude angle, and collecting mass spectrum data through a mass spectrometer; and associating the acquired mass spectrum data with the three-dimensional space coordinates of the corresponding sampling points, and reconstructing a three-dimensional distribution image of molecules on the surface of the sample to be detected. According to the invention, high-spatial-resolution and high-sensitivity mass spectrum imaging on the surfaces of crisp samples which cannot be sliced and irregular samples can be realized.

The invention provides a device and method for measuring the channel temperature of a silicon-based transistor, and relates to the technical field of temperature measurement, and the device comprises a superconducting coil which is used for providing a magnetic field for the transistor so as to form two spin-state energy levels; the low-temperature thermostat is used for providing a low-temperature environment for the transistor, and in the low-temperature environment, a first ratio of particle population numbers on the two spin-state energy levels meets Boltzmann distribution related to the temperature value of the channel; the tunable laser module is used for generating first laser in a near-infrared band; the current processing module is used for collecting tunneling current; the processor is used for determining the photo ionization signal intensity; based on the photoionization signal intensity, determining a second ratio of the probabilities of photoionization events on the two spin state energy levels; determining a first ratio based on the second ratio; and obtaining the temperature value of the channel according to the Boltzmann distribution and the first ratio.

1. Name of the Design Product: Photoionization Disinfection Machine. 2. Use of the Design Product: The design product is used for air disinfection and purification. 3. Design Key Points of the Design Product: Lies in the shape of the product. 4. Picture or Photo that Best Illustrates the Design Key Points: Perspective view.

The application provides a method for monitoring dioxins in flue gas by photoionization time-of-flight mass spectrometry online, screening volatile organic pollutants with high concentration or high instrument response in flue gas as dioxin indicators, directly monitoring the indicators in flue gas by photoionization time-of-flight mass spectrometry online, establishing the correlation between high-abundance indicators and dioxins by the simultaneous monitoring of indicators online and the offline detection of dioxins, and realizing the indirect online monitoring of dioxins in flue gas. The online monitoring cycle of the application is 20 min, and the offline sampling cycle is 120 min, so that 6 points of online monitoring can be carried out in 1 offline sampling cycle, and the correlation model is established by using 6 online monitoring points corresponding to 1 offline sampling point in the model establishment process. The online monitoring model of dioxins established by the application is a single or multiple correlation model, which guarantees the applicability of the correlation model, and the fault tolerance and risk resistance of the application to complex incineration environment.