104 results about "Microchannel plate detector" patented technology

The invention discloses a high-speed multi-photon detection system and method. The system comprises a detector and a signal processing circuit, wherein the detector is composed of a window plated with a photoelectric cathode, a micro-channel plate stack and an anode; a plurality of incident photons are converted into a plurality of photoelectrons by the photoelectric cathode, and the photoelectrons are converted into electron cloud by the micro-channel plate stack; the incident electron cloud is divided into multiple paths by three layers of staggered metal strip electrodes of the anode, and charge collection is carried out to obtain charge short pulses of each layer of electrode; the signal processing circuit converts the charge short pulses transmitted by the three layers of electrodes into digital pulse signals, obtains the centroid coordinates of the electron cloud from the digital pulse signals as the abscissa value, the ordinate value and the verification value of the incident photon position, combines the abscissa value, the ordinate value and the verification value based on the screening condition to obtain the target two-dimensional coordinates, and finally obtains the target two-dimensional coordinates. And transmitting to a terminal for imaging display. According to the invention, a plurality of synchronous photons can be detected, the overall counting rate of the detector is greatly improved, and the detection efficiency is improved.

The invention discloses an axial asymmetric micro-channel plate structure based on an amorphous silicon material and a preparation method of the axial asymmetric micro-channel plate structure. The axial asymmetric micro-channel plate structure comprises a plurality of micro-channels arranged in a penetrating mode in the thickness direction of a device; each micro-channel is provided with an inlet section and an outlet section along the axial direction of the micro-channel plate; the channel geometric parameters of the micro-channels are different on the inlet section and the outlet section; or the equivalent electric fields of the micro-channels are distributed on the inlet section and the outlet section in a different manner; the inlet section of each micro-channel is used for regulating and controlling the initial incidence condition of electrons and the first effective interaction between the inlet section and the inner wall of the channel; collaborative design is carried out on geometrical morphology, electrical characteristics and material characteristics of the microchannels in the axial direction according to different physical stages of the electronic multiplication process corresponding to the structural level of the microchannels. According to the structure, higher controllability and consistency are obtained in the multiplication and transmission process of electrons in the channel on the structural level, and the structural rationality and design flexibility of the micro-channel plate serving as an electron multiplier are improved.

The present disclosure relates to a flow channel plate, a preparation method thereof and a primary and secondary hydrogen converter, wherein Fe2O3 and / or Fe3O4 are deposited in the first micro-channel of the heat exchange plate by magnetron sputtering, the prepared flow channel plate has a catalyst layer with uniform thickness, and the catalyst layer has strong bonding force with the micro-channel plate material, which can avoid the problems of large heat fluid channel resistance and large hydrogen flow pressure drop caused by uneven catalyst filling thickness, and is conducive to improving the heat exchange efficiency of cold and hot fluids and the primary and secondary hydrogen conversion efficiency, while reducing space occupation.

The application belongs to the technical field of photon imaging detection, and particularly relates to a photon counting imaging detection system based on a mixed anode. The system comprises a vacuum sealed tube detector composed of a window coated with a photocathode, a microchannel plate stack and a mixed anode, and a signal processing circuit. The photocathode is used for converting photons incident through the window into photoelectrons. The microchannel plate stack is used for converting the photoelectrons into electron clouds. The mixed anode comprises a strip anode and a delay line anode arranged orthogonally, and the mixed anode transmits the collected charge short pulses of each channel to the signal processing circuit. The signal processing circuit calculates the two-dimensional coordinates of the photons based on the collected charge short pulses of each channel, and then transmits the two-dimensional coordinates of the photons to a terminal for imaging display. The application provides a photon counting imaging detection system based on a cross strip-delay line mixed anode, and solves the problem that the existing position sensitive anode detector cannot simultaneously have high spatial resolution and high temporal resolution.

The application provides an X-ray communication device and method based on a laser-driven matrix photocathode. The device is applied to the technical field of X-ray tubes and comprises a laser control circuit, a matrix transmission photocathode array, a collimating microchannel plate, a matrix transmission anode target array, a vacuum tube shell and a beryllium window. The method comprises: generating a dynamic pattern, loading data information to be input into an optical signal; and exciting photoelectron emission with spatial resolution characteristics at a corresponding photocathode pixel area; each channel cluster is aligned with a single photocathode pixel at the front end; after the electrons enter the microchannel, continuous secondary electron emission occurs under the action of the electric field on the inner wall of the channel, and an avalanche effect is generated; and through mechanisms such as bremsstrahlung radiation, a bundle of microfocus X-rays is generated at each target point. In this way, the technical problems of the X-ray source in the prior art, such as the limitation in spatial coding capability, response speed, integration degree and communication dimension, can be solved.

The invention discloses a vacuum and solid integrated lightweight digital solar blind ultraviolet device, which comprises a glass input window, an ultraviolet photocathode, a microchannel plate, a digital readout circuit chip and a ceramic tube shell, the ultraviolet photocathode is attached to the front surface of the glass input window; the ultraviolet photocathode, the micro-channel plate and the digital readout circuit chip are arranged in a vacuum chamber of the ceramic tube shell; the micro-channel plate is positioned right below the ultraviolet photocathode; the digital readout circuit chip is located right below the micro-channel plate, and the device adopts a proximity packaging structure. The device is a high-resolution, integrated and lightweight vacuum digital solar blind device, does not need coupling, is integrated, realizes image digital output, is convenient to use and signal transmission, and is safe and reliable to use.

The invention provides an X-ray communication device and method based on a laser driving matrix type photocathode. The device is applied to the technical field of X-ray tubes and comprises a laser control circuit, a matrix transmission type photocathode array, a collimation type structure micro-channel plate, a matrix transmission type anode target array, a vacuum tube shell and a beryllium window. The method comprises the following steps: generating a dynamic pattern, and loading data information to be input into an optical signal; photoelectron emission with spatial resolution characteristics is excited in a corresponding photocathode pixel area; each channel cluster is aligned with a single photocathode pixel at the front end; after the electrons enter the micro-channel, continuous secondary electron emission occurs under the action of an electric field on the inner wall of the channel, and an avalanche effect is generated; a beam of micro-focus X-rays is generated at each target spot through mechanisms such as tough-induced radiation. In this way, the technical problem that in the prior art, an X-ray source is limited in space coding capacity, response speed, integration degree and communication dimension can be solved.

The invention relates to a three-dimensional uniform-temperature liquid cooling plate, a manufacturing method thereof and a server heat dissipation system. The three-dimensional uniform-temperature type liquid cooling plate comprises a housing, which is internally provided with a sealed cavity and is provided with a cooling liquid inlet and a cooling liquid outlet; the three-dimensional uniform temperature plate is arranged in the sealed cavity of the shell, the three-dimensional uniform temperature plate comprises a bottom plate used for making contact with a heat source and a micro-channel plate which is connected with the bottom plate and extends towards the top face and the at least two side faces of the shell, and therefore a steam cavity internally containing a working medium is defined by the three-dimensional uniform temperature plate and the micro-channel plate; a micro-channel flow channel is formed in the outer side wall of the micro-channel plate; and a flow channel space for cooling liquid to flow is formed between the inner wall of the shell and the outer side wall of the micro-channel plate of the three-dimensional uniform-temperature plate, so that the cooling liquid flowing in from the cooling liquid inlet can flow through the area where the micro-channel flow channel is located, and heat is brought out from the cooling liquid outlet.

This invention discloses a two-phase liquid cooling system combining a drawer-type integrated structure with a flexible cold plate, relating to the fields of thermal management and two-phase liquid cooling technology. It includes a microchannel plate module, in which an internal microchannel network is etched into the flexible cold plate, followed by microchannel processing and surface treatment to generate a microchannel flexible cold plate; a liquid path connection module, which connects the assembled cold plate assembly to the inlet and outlet pipes of the two-phase coolant and includes a liquid path monitor to obtain a liquid path cold plate assembly; and a flow rate balancing module, which, based on the liquid path monitoring data, adjusts the flow rate and local pressure of the two-phase coolant in each microchannel in real time to obtain a balanced cold plate assembly. By embedding the microchannel flexible cold plate into the drawer-type support structure and pressing it tightly together, the system achieves both efficient heat conduction and close contact while maintaining the flexibility of being removable and replaceable, significantly improving assembly reliability and heat exchange efficiency.

The invention discloses a silicon-based micro-channel plate (MCP) structure and a manufacturing method thereof, relates to the technical field of semiconductor device manufacturing, and aims to solve the problems of poor high temperature resistance, insufficient etching precision, film layer quality defect and process synergy deficiency of a traditional glass-based / organic-based MCP. An 8-inch N-type monocrystalline silicon wafer is adopted in the structure, the thickness of the N-type monocrystalline silicon wafer is (250-350) + / -25 microns, micropores of 3-10 microns are evenly distributed, the hole pitch is 7-22 microns, the inclination angle is 6-12 degrees, the side wall roughness is smaller than or equal to 50 nm, the perpendicularity deviation is smaller than or equal to + / -0.5 degrees, an AlO or AlO / HfO / AlO electron multiplication layer with the thickness of 10-30 nm is prepared on the inner wall of a channel through ALD, and a Cr / Ni electrode with the thickness of 50-80 nm is plated on the surface. According to the method, the OES is used for monitoring SiFs in real time. According to the invention, the double targets of < = 30% of 1kg impact fracture rate and stable electron multiplication gain are achieved, the tolerable temperature reaches 800 DEG C, the secondary electron emission efficiency is improved by 25%, the production efficiency is improved by 20%, the cost is reduced by 15%, and the method is suitable for the high-sensitivity detection fields of night vision imaging, particle detection and the like.

The invention discloses a laser speed measuring device. According to the laser speed measurement device, a photoelectric cathode is connected with a micro-channel plate through a vacuum bonding technology, and the photoelectric cathode is used for converting a laser signal into a photoelectronic signal and transmitting the photoelectronic signal to the micro-channel plate; the micro-channel plate is connected with the fluorescent screen through a vacuum bonding technology, and the micro-channel plate is used for carrying out electron multiplication processing on the photoelectron signals and transmitting enhanced electronic signals to the fluorescent screen; the fluorescent screen is connected with the nano optical fiber taper coupling structure through a vacuum bonding technology, and the fluorescent screen is used for sending a visible light signal to the nano optical fiber taper coupling structure; the nano optical fiber taper coupling structure is connected with the CCD chip, and the nano optical fiber taper coupling structure is used for transmitting the visible light signal to the CCD chip; the CCD chip is used for receiving the visible light signal, converting the visible light signal into a digital signal and transmitting the digital signal to the control module so as to determine speed data of the laser signal according to the digital signal. According to the invention, the transmission efficiency of the laser signal is improved, and the determination precision of the speed data of the laser signal is improved.

The application provides a solid edge glass material for controlling deformation of an ultrathin microchannel plate and an application thereof, and the solid edge glass material comprises the following components in percentage by mass: SiO2 60-70%; Na2O 8-12%; K2O 5-10%; MgO 2-8%; CaO 2-8%; and BaO 1-5%. The coefficient of thermal expansion of the solid edge glass material is higher than that of the effective area skin glass material, and the softening point of the solid edge glass material is lower than that of the effective area skin glass material. The single material solid edge made of the solid edge glass material forms a tensile stress on the effective area before hydrogen reduction of the microchannel plate, offsets the change trend of the volume and the coefficient of thermal expansion of the effective area skin glass during the hydrogen reduction process, and solves the deformation problem of the ultrathin microchannel plate during the hydrogen reduction process.

Manufacturing a detector device such as a microchannel plate (MCP) includes using a first atomic layer deposition (ALD) process with first precursor materials to deposit a resistive layer on a substrate and thereby form a resistive-coated substrate, the first precursor materials including a conductive rhenium material and an insulative aluminum material. The resistive layer is deposited as interspersed conductive and insulative regions of a rhenium constituent and an aluminum constituent respectively in a predetermined ratio. A second ALD process with second precursor materials is used to deposit an emissive layer on the resistive-coated substrate, the emissive layer being constituted to generate electrical carriers in use of the detector device to be sensed by external sensing circuitry as detected events. The first ALD process is performed at a deposition temperature sufficiently above 200° C. to obtain a dark-current contribution of the resistive layer of less than about 600 Hz / cm2.

The invention relates to a micro-channel plate manufacturing method based on a mold pouring method and a micro-channel plate. The method comprises the steps that a silicon microchannel array substrate is placed on a metal mold material, and holes of the silicon microchannel array substrate face downwards; based on a crucible and a vacuum hot melting filling device, liquefying a metal mold material and filling the metal mold material into the silicon micro-channel array substrate; cooling to realize metal curing to obtain a metal mold precursor, and corroding silicon to obtain a metal mold; putting the high borosilicate glass material and the metal mold into a crucible, and filling the high borosilicate glass material into the metal mold based on a vacuum hot melting filling device; cooling to obtain a glass-metal complex, and corroding a metal material to obtain a micro-channel plate substrate; carrying out hydroxylation treatment; and preparing a dynode on the micro-channel plate substrate, and performing annealing treatment to obtain the micro-channel plate. The microchannel plate with a high softening point and high purity can be manufactured, the yield is high, noise is low, exhaust in the channel is sufficient, and the service life of the image tube is prolonged.

This utility model discloses a microchannel plate heat exchanger structure and heat exchanger. The microchannel plate heat exchanger structure includes a first mounting plate, a second mounting plate, and multiple stacked basic cells disposed between the two. Each basic cell includes a first and a second heat exchange unit, and metal partitions are provided between the two and adjacent basic cells. The capillary array of the heat exchange unit is bilaterally symmetrical and shares a common working fluid inlet, which can uniformly distribute the working fluid, achieving the flow distribution and heat exchange effect of two parallel microchannel heat exchangers. Moreover, bilateral countercurrent heat exchange can be achieved between adjacent heat exchange units. The heat exchanger of this utility model realizes the integration of "tube box-core" and "flow distribution-heat exchange". Compared with the traditional parallel connection of two heat exchangers, it reduces volume and weight, achieves uniform flow distribution, and reduces some external branch pipes and valves, thereby reducing hardware costs, reducing leakage risk, and enhancing the pressure resistance and service life of the heat exchanger.

The present application relates to the technical field of spectral imaging detection, and particularly relates to a cross-bar anode photon counting imaging detector splicing system and a splicing method, which respectively cover ultraviolet, visible and near-infrared bands, each detector unit comprises a vacuum sealed tube composed of a glass window coated with a photocathode, a cylindrical micro-channel plate stack, a resistance anode and a cross-bar anode, and a position reading circuit, wherein the curvature radius of the cylindrical MCP stack is matched with the focal plane curvature radius of the Rowland circle spectrometer to improve the spectral resolution. Four detector units are connected in one-to-one correspondence to form a long strip electrode array in the direction perpendicular to the spectral imaging direction, and the position reading circuit is used for processing charge pulses to determine the electron cloud centroid position. The curvature radius of the cross-bar anode single-photon imaging detector unit can be matched with the curvature radius of the cylindrical focal plane of the Rowland circle spectrometer, the spectral resolution of the spectrometer is improved, and continuous imaging of a wide spectral band of 115 nm to 900 nm is realized.

The application discloses a kind of compact structure, high time resolution microchannel plate assembly, it can be applied to analytical instrument such as mass spectrometry detection field.The microchannel plate assembly includes: output electrode column, fixed screw, insulating substrate, anode cover plate, anode plate, output electrode plate, microchannel plate, metal shielding base, positioning sleeve, wherein, output electrode plate and output electrode column are connected to each other and constitute the output electrode of microchannel plate;Anode plate is connected to each other by plane anode pattern and conical receiving terminal and constitutes;Microchannel plate input surface is plated with high secondary electron emission film, to realize the high detection efficiency of microchannel plate assembly.Insulating substrate, anode cover plate, anode plate, output electrode plate, microchannel plate and metal shielding base are fixed by fixed screw and become integrated form, with compact structure, high time resolution characteristics.

A ion detector for a mass spectrometry apparatus is disclosed. The ion detector comprises: a microchannel plate (MCP), a scintillator, and a photomultiplier (PMT), the MCP comprising a MCP assembly and an isolation part fixed to the MCP assembly, the MPC assembly being configured to convert ions into electrons, the scintillator being configured to convert electrons into light, and the photomultiplier being configured to convert the light into an electrical signal. The isolation part of the MCP comprises at least one element, called isolation element, made of ceramic.

The application discloses a novel ray detector, characterized in that the novel ray detector comprises a Cerenkov radiation material window, a photocathode surface plated on a light exit surface of the Cerenkov radiation material window, a microchannel plate and a readout circuit board; wherein the Cerenkov radiation material window is a glass optical fiber panel, used for receiving incident gamma rays and inputting Cerenkov light generated by the incident gamma rays into a fiber core to the photocathode surface; the photocathode surface is used for converting the Cerenkov light into photoelectrons and transmitting the photoelectrons to the microchannel plate through a vacuum electric field; and the microchannel plate is used for inputting the received photoelectrons into the readout circuit board after amplification by multiplication. The application can realize better position resolution.

This invention discloses a microchannel plate glass and its preparation method, relating to the field of special glass materials technology. The microchannel plate glass includes a skin glass and a core glass. The skin glass includes P2O5, V2O5, BaO, La2O3, Li2O+Na2O+K2O, ZrO, Al2O3 and Al(OH)3, PbO, and Fe2O3. The core glass includes P2O5, ZnO, Al2O3 and Al(OH)3, SiO2, CaO+MgO, and BaO. This invention overcomes the shortcomings of traditional lead-containing silicate glass as a substrate material for MCP microporous arrays. Furthermore, the microchannel plate made of semiconductor glass does not require hydrogenation heat treatment and does not exhibit this "cation feedback" phenomenon. Compared to microchannel plates made of ordinary glass, the bulk conductivity microchannel plate can maintain stable performance over a long period. By screening specific material components and optimizing the ratio of each component, the skin glass and core glass can simultaneously possess a stable network framework and a high softening temperature, while achieving a precise match between their coefficients of thermal expansion and high-temperature viscosity coefficients.

The invention provides a high-efficiency X-ray imager containing a built-in transmission line and a preparation method of the high-efficiency X-ray imager. A conductive strip is arranged on the input surface of a lower micro-channel plate, conductive strips are arranged on the input surface and the output surface of an upper micro-channel plate, and the output surface of the upper micro-channel plate is oppositely attached to the input surface of the lower micro-channel plate; the conduction band strip units on the two faces are in one-to-one correspondence, and the micro-channels of the two micro-channel plates are in butt joint to form the micro-channel plate assembly. According to the micro-channel plate assembly, the two groups of micro-channels are in butt joint with each other, the gain is improved, detection of weak electronic signals is met, meanwhile, the design of the conductive strips and the built-in transmission lines formed by the conductive strips is combined, multi-mode polaritons are excited under the single frequency, and the requirement for parallel processing of multi-dimensional information is met.

The invention provides a method for rapidly forming and processing a V-shaped channel micropore array optical element on a single transparent glass substrate and the prepared micropore array optical element, and the method comprises the following steps: carrying out synchronous laser drilling on a vertically placed glass sheet by adopting inclined double laser processing heads positioned on the same horizontal base line by utilizing a laser-induced etching technology; and then carrying out wet etching treatment, and rapidly forming and processing the V-shaped channel micropore array optical element on a single transparent glass substrate. The structure of the V-shaped channel is controlled by independently regulating and controlling the inclined angle, the wire length, the energy and the focus processing parameters of laser emitted by each laser processing head; the problems that a traditional straight-channel micro-channel plate is large in positive ion feedback noise, multiple stacked V-shaped and Z-shaped micro-channel plates are poor in position resolution time response performance, and a hot-melt pressure bending micro-channel plate is poor in curvature consistency are solved, and the micro-channel plate can be applied to the field of photoelectric detection imaging requiring low ion feedback, ultrahigh gain and fast time response.

The utility model relates to the technical field of plate heat exchangers, and discloses a gas micro-channel plate heat exchanger which comprises a shell and communication ports formed in the positions, close to the left side and the right side, of the top of the shell, clamping rings are attached to the positions, close to the left side and the right side, of the front side of the shell, and connectors are fixedly installed in inner cavities of the clamping rings in a penetrating mode. Connecting openings are formed in the positions, close to the left side and the right side, of the front side of the shell, the rear ends of the connecting heads penetrate through the adjacent connecting openings correspondingly and extend into an inner cavity of the shell, and the rotating pipe, the rotating ring, the sealing ring, the threaded pipe, the fixing ring, the sealing groove and the rotating groove are matched with one another, so that the sealing effect is improved. The threaded pipe can be directly rotated when the connector is connected with an external pipeline, the stability between the rotating pipe and the connector can be achieved through mutual matching of the sealing ring and the sealing groove, the influence of the length of the external pipeline is not needed, screwing-in is convenient, the operation effect is better, and rapid connection operation is facilitated.

The invention discloses a time spectrometer system and method based on a microchannel plate photomultiplier (MCP-PMT). The constant proportion discriminator is triggered by adopting an attenuation branch / delay branch differential zero crossing point, and performs latch width limiting and level conversion on a trigger pulse; fPGA-based multi-level carry chain time TDC is adopted, and parallel tap sampling, bubble suppression and code density calibration table look-up correction are carried out; a processing flow of time window histogram accumulation, a first effective hit strategy, a background adaptive threshold and multi-peak positioning and fitting is adopted. According to the invention, the picosecond-level timing precision is obtained at a low clock rate, the sensitivity and precision of weak light signal flight time distance measurement are significantly improved, and the method is suitable for laser radar imaging and high time sequence of time correlation single photon counting, can realize sub-hundred picosecond-level time resolution, and is suitable for flight time distance measurement under a weak light condition.

The invention relates to edge-covered glass for a micro-channel plate, a preparation method of the edge-covered glass and the micro-channel plate, and belongs to the field of glass for micro-channel plates. The composition for the edge-covering glass for the micro-channel plate comprises the following raw materials in percentage by mass of oxides: 52-70% of SiO2; 4 to 6 percent of Al2O3; 1 to 3% of Y2O3; 4 to 6 percent of K2O; 2 to 4 percent of Na2O; the sum of the contents of the Nb2O5 and the MoO3 is 14 to 22 percent; the sum of the content of MgO and the content of CaO is 5-8%. Specific components are selected, and the ratio of the components is adjusted, so that the edge-covered glass has a relatively strong framework, the bending strength is greater than or equal to 70MPa, the transformation temperature Tg is greater than or equal to 650 DEG C, the softening temperature Tf is greater than or equal to 710 DEG C, and the thermal expansion coefficient is 75-80 * 10 <-7 > / DEG C; and the glass is better matched with third-generation leather glass. The obtained micro-channel plate is not deformed or damaged after being prepared in a whole process.

The invention provides a microchannel plate for cathode electron self-focusing in a photocathode X-ray tube and a use method. A micro-channel plate is applied to the technical field of high-performance X-ray tubes, a substrate is a physical substrate of the micro-channel plate and is of a Fresnel lens structure, and the substrate is provided with a plane incident plane and a distorted surface output plane formed by concentric annular belts; a gradient aperture array is distributed on the substrate, and the gradient aperture array is arranged on the plane of the substrate; the radial gradient material is a surface functional coating of the inner wall of the micro-channel; the variable aperture channel is an inner wall surface three-dimensional contour of each independent micro-channel forming the gradient aperture array, and each independent micro-channel in the gradient aperture array is defined. Different secondary electron emission materials are coated on the surface of the inner wall of each micro-channel defined by the gradient aperture array in a partitioned manner along the radial direction. In this way, the problems that in the prior art, an X-ray tube is loose in structure and poor in performance can be solved.

The application belongs to the technical field of glass and specifically relates to a glass material with high corrosion resistance and stability, the cation composition of which is as follows in terms of mole percentage: 61-70% of Si 4+ , 3-12.5% of B 3+ , 1-5.5% of Al 3+ , 5-13% of K + , 5-13% of Na + , 0.2-3% of Ca 2+ , 0.1-2% of Li + , 0.1-1% of Mg 2+ , and 0.1-1% of Ti 4+ . The application is designed in a multi-component and multi-functional synergistic manner, so that the prepared glass meets the harsh requirements on thermal, optical, chemical and processing properties, is suitable for high-end optical devices such as micro-channel plates, and has a wide application prospect in the fields of photoelectric detection and imaging, mass spectrometers, high-energy physics, streak cameras, high-end medical imaging and the like.

This invention provides a method and related equipment for measuring molecular beam density, applied to a molecular beam density measurement system. The system includes a vacuum chamber, a precision leak valve, a vacuum ion gauge, a microchannel plate detector, and a laser ionization device. The method includes: controlling the opening of the precision leak valve to introduce background gas into the vacuum chamber and obtaining the standard density of the background gas; photoionizing the background gas and acquiring a first ion signal through the microchannel plate detector; establishing a quantitative calibration relationship between the first ion signal and the standard density; maintaining the operating parameters of the laser ionization device consistent with those used when establishing the quantitative calibration relationship, controlling the laser ionization device to photoionize the target molecular beam and acquiring a second ion signal generated by the target molecular beam; and calculating the absolute density of the target molecular beam based on the second ion signal using the quantitative calibration relationship. This application can improve the accuracy of molecular beam density measurement by introducing a standard gas of known density to establish a quantitative calibration relationship.

The invention relates to the technical field of nuclear reactor fuel cladding oxidation film thickness measurement, and discloses a nuclear reactor fuel cladding oxidation film thickness measurement device and method, and the device comprises a femtosecond laser system, an optical parameter adjustment system, a focusing adjustment system, an electrode plate, a micro-channel plate detector and a data acquisition system. The device has the beneficial effects that the thickness of the surface oxide layer can be effectively detected, the device is particularly suitable for detection of trace components, the bottlenecks of a traditional method in detection lower limit and precision are broken through, the device is compact in structure, and reliable and efficient technical support is provided for state monitoring and safety evaluation of the nuclear power station fuel cladding.