201results about How to "Improve sample preparation efficiency" patented technology

The invention discloses a remoulding soil sample preparation device, comprising a base, a sample containing mould, a compacting instrument, a positioning device, a clamping rod and a bearing plate, wherein the sample containing mould is fixedly arranged on the base; the positioning device is sheathed on the clamping rod, is vertically moved along the body of the clamping rod, is rotated by a set angle along the horizontal direction, and is clamped on the clamping rod by a clamping mechanism to position the height of a sample; the compacting device and the bearing plate are respectively and fixedly arranged at both ends of the clamping rod; the diameter of the compacting device is matched with the inner diameter of the sample containing mould, the inner diameter of the positioning device is matched with the size of the clamping rod, and the outer diameter of the positioning device is greater than the outer diameter of the sample containing mould; after the compacting device compacts the sample, the bottom end surface of the positioning device is connected with the top end surface of an opening of the sample containing mould to prepare the sample; by changing the height of the sample positioned by the positioning device on the clamping rod, soil samples with different heights can be prepared. The remoulding soil sample preparation device has the advantages that the structure is simple, the operation is convenient, the accuracy is higher, the suitability is wide, and the number of sample compacting layers and the sample compacting height of each single layer can be flexibly changed according to different heights of the prepared samples.

The present invention relates to a carbon and hydrogen isotope analysis pre-treating device for gas and liquid inclusion in minerals. The analysis pre-treating device comprises a high-temperature bursting system, an oxidization system, a separating purifying system, a carbon dioxide collecting pipe, a reduction system, a hydrogen collecting pipe and a vacuum system which are in sealing connection in turn, wherein the high-temperature bursting system comprises a quartz pyrolysis tube and a first vacuometer; a copper oxide furnace is used as the oxidization system; the separating purifying system comprises a fifth cold trap, a second vacuometer and a first cold trap which are in sealing connection in turn; the reduction system comprises a second cold trap, a first vacuum measurement device, a zinc furnace, a second vacuum measurement device and a third cold trap; and the vacuum system comprises a mechanical pump and a diffusion pump. The first vacuometer of the analysis pre-treating device provided is utilized to monitor the bursting degree of a sample, so as to determine the bursting temperature and the bursting time of various samples. Due to the design of the first vacuum measurement device and the second vacuum measurement device, the analysis pre-treating device can be used for monitoring the reduction degree of water.

The invention discloses a slurry consolidating apparatus and a use method thereof. The slurry consolidating apparatus comprises a power supply system, a sample production platform system and a die system. The method comprises the following steps: mixing fine grained soil with air-free water, pouring the obtained mixture into a container, sealing, storing, and stirring after water is fully absorbed; completing assembling of the die system; fixing the die system to a sample disposing base plate of the sample production platform; pouring a slurry into a sample die through a funnel; adjusting the height of a reaction force crossbeam to make a presser contact with the upper surface of the slurry; starting an inflator, and carrying out grading loading; allowing the sample to be in a sealed state; and applying an axial consolidating pressure, and respectively adding negative pressures with equal size to a top cover and a die pedestal to accelerate consolidation until consolidation is completed. The apparatus and the method effectively reduce the disturbance possibility of the sample, improve the repeatability of the sample, make the sample have uniform water content and particle size distribution, and effectively improve the sample production efficiency and the quality of the sample.

The invention discloses sample preparation equipment dedicated to a triaxial test and capable of preparing a high-density disturbed soil sample. The equipment comprises an electric hydraulic jack, a top plate, a middle plate, a bottom plate, supporting rod strings and a pile casing, wherein the electric hydraulic jack is equipped with an extension piston rod; scales are formed in the piston rod; a pressing disc is connected with one end of the piston rod; under the control of an electronic switch, the electric hydraulic jack drives the piston rod and the pressing disc to precisely compact a soil body to a corresponding position in the pile casing; after sample pressing is finished, the pile casing is inverted on the middle plate, and the obtained soil sample is pushed out by the electric hydraulic jack. Through adoption of the equipment, the extremely common defects that the compactness can hardly be controlled precisely, the equipment is deformed, and the prepared soil sample can hardly be taken out when the conventional sample preparation method is adopted, especially when the prepared soil sample is a high-density soil sample, are overcome; the equipment is simple to operate, and has the advantages that the workload of remolded sample preparation is reduced, the impact of a human factor on a test sample is mitigated, the precision and the efficiency of sample preparation are improved, and the problems existing in the disturbed soil sample preparation process are solved.

The invention provides a device and a method for detecting mechanical parameters of hydrate-containing sediments based on X-CT. The device comprises a reaction kettle, a shear loading unit, a back pressure control unit, an unloading pressure loading unit and a strain measurement unit, wherein the reaction kettle body is a beryllium or carbon fiber pressure-resistant pipe, and the two end are sealed with end covers; the outer side of the lower end cover is connected with an axial pressure loading counter-force mechanism; an upper sample adjusting cushion block, a sediment sample, a lower sampleadjusting cushion block and an axial pressure loading piston are arranged in the reaction kettle from top to bottom. According to the device and the method, high-pressure conditions required for synthesizing the methane hydrate are met, and the axial temperature of the sample can be precisely controlled, so that the sample is uniformly distributed; the sample preparation efficiency can be improved through the rapid temperature control, the sample size can be adjusted, and the purpose of controlling height-diameter ratios of the different samples is achieved; and the synchronous detection of astress-strain curve of the sediments containing the natural gas hydrate and the internal destructive microstructures of the sediments can be achieved, and the constant strain shearing and the constant stress creep tests can be realized.

The invention discloses an unsaturated soil multifunctional triaxial apparatus and a sample preparation device thereof. The triaxial apparatus comprises a rack, a pressure chamber, a precision volumechange measuring device, an axial load piston, an axial load sensor, a displacement sensor, an axial load and axial deformation rate control / data acquisition and processing system, a water-gas-circuitcontrol cabinet, a water supply device and a microcomputer. Suction can be conveniently applied or controlled, strain rate can be controlled to be constant, and deviator stress can also be controlledto be constant. A sample can be immersed in a certain stress state, after swelling / collapsibility / soaking deformation is stable, the suction is applied to perform drainage and dehumidification, the influence of drying and watering cycle under triaxial stress conditions on mechanical properties of soil is researched, pore air pressure is measured by a micro-sensor, triaxial shear test without drainage or exhaust can be performed, and the pore air pressure is accurately measured. Volume change measuring precision is high, errors are small, sample preparation is simple, convenient and rapid, thedry density of the sample can be accurately controlled, and sample preparation efficiency and the technical level of sample preparation are improved.

The invention relates to a test sample for tensile properties of a large tow carbon fiber multifilament and a sample preparation method thereof, and belongs to the field of material property testing.The method comprises the steps that tension is applied to wind the carbon fiber multifilament of not less than 24 k around a frame; gum dipping, gum leaching and heat curing are conducted on the framewound with the multifilament, and the gum-dipped multifilament is cut into multifilament segments after cooling; a set of metal or composite reinforcing sheets are respectively bonded to the two endsof the multifilament segments, wherein each set includes two reinforcing sheets disposed oppositely, a structure glue film is bonded to the inner surface of at least one of the two reinforcing sheets, the middle region and the peripheral edge region of the inner surface are vacated in bonding, and the two ends of the multifilament segments are located in the middle region; the reinforcing sheetsare pressed, heated and cured to obtain the test sample. By adopting the method, the mechanical properties of the reinforcing sheets are improved, the bonding strength between the multifilament and the reinforcing sheets is improved, and the problems of tear damage of the reinforcing sheets and debinding and slippage of fiber when the obtained test sample is used in a tensile test are avoided.

The invention relates to a device and method for high-throughput, continuous and rapid preparation of an alloy sample. The device comprises a rotating system, a dispensing system, a heating and melting system, a cooling and solidifying system, a sampling system and a PLC control system; a dispensing zone, a heating and melting zone, a cooling and solidifying zone and a sampling zone are located ona rotating table. A container placed above the dispensing zone is controlled by the PLC and dispenses the alloy to a crucible which is rotated to the zone according to a preset alloy distribution ratio; a melting cavity and a cooling device respectively placed above the heating and melting zone and the cooling and solidifying zone are respectively used for melting and solidifying the alloy in thecrucible; a sample push-out device placed under the sampling zone is used for taking out the solidified sample from the crucible. According to the device and method for high-throughput, continuous and rapid preparation of an alloy sample, a circular-type alloy sample preparation integrating heating and melting, cooling and solidifying, sampling can be realized on the rotating table. The device iscompact in structure and high in automation degree, the time for raw material dispensing, multi-furnace smelting and preparation is shortened, and high-throughput, continuous and rapid preparation ofthe alloy sample can be realized.

The invention relates to a hollow sample making device, comprising a pressure head mechanism, two transmission mechanisms and a controller, wherein the pressure head mechanism is composed of an upper die head, a lower die head and an outer die; the transmission shafts of the two transmission mechanisms are connected with a screw rod in a symmetrical manner; the screw rod is connected with nut pieces which respectively fasten the lower die head and the upper die head by bolts; the nut piece is provided with a position sensor; and the transmission mechanism and the position sensor are connected with the controller via cables. In the invention, a bidirectional compaction structure in which the upper and lower die heads simultaneously apply pressure on the outer die is adopted in the sample making process; and a die adopts an embedded die cavity structure, and the size and model of the die can be changed according to the samples. The sample making device in the invention has scientific design, simple structure, convenient operation and use and high cost performance, and fundamentally solves the difficult problems of scale material feeding and automatic demoulding in the preparation process of making samples, thus realizing mechanical operation and batch production and having the advantages of rapidness, efficiency, low cost, good sample repeatability and strong comparability; and in addition, the sample making device can make samples in the geotechnical detection field, and popularizes preparation for various test samples similar to ground.

The invention discloses a remolded soil sample preparation device capable of controlling density through weight and air pressure combined loading. The remolded soil sample preparation device comprises an air pressure raising device part and a sample preparation tube part, wherein the sample preparation tube part comprises a vertically arranged sample tube; the top of the sample tube is connected with a weight through a pressure bar; the weight is arranged on a tray on the top of the pressure bar; the bottom of the pressure bar is provided with a pressing plate for pressing a soil sample in the sample tube; and the pressing plate extends into the sample tube. After weight loading is performed by using the device, pressurization is performed through an air compressor, so that the purpose of accurately controlling the density of a remolded soil sample is achieved, the sample preparation period is greatly shortened, and the remolded soil sample having a given water content or given density can be prepared according to requirements; the prepared soil sample is uniform, thereby greatly improving the reliability of experimental results; and instruments are used to realize quantitative control of the air pressure and the sample height, thereby greatly reducing various operation errors caused by artificial operation.

The invention discloses a preparation device and method for a cohesionless soil sample for a geotechnical test. The device comprises a sample loading part, a sample compacting part, a sample pre-saturation part and a vacuumizing part, wherein the sample loading part comprises a first split mold, a second split mold, a bottom lantern ring, a top lantern ring, two annular hoops, two rubber rings anda rubber film. The rubber film is flatly attached to inner walls of the first split mold and the second split mold with a vacuumizing method, defects on side surfaces of the sample are reduced, and uniformity and flatness of the side surfaces of the sample are guaranteed; bottom stability of the sample loading part is improved by the bottom lantern ring, and the top lantern ring helps to reduce soil mass loss and pollution to geotechnical test equipment in the preparation process of the top sample; the pre-saturation part and the vacuumizing part are universal, and the preparation device andmethod can be applied to cohesionless soil sample preparation of different precision geotechnical tests after sizes of the sample loading part and the sample compacting part are adjusted according tothe size of the geotechnical test equipment and the size of the sample.

The invention discloses a preparation method of a nickel steel-containing sample for an EBSD analysis. The method comprises the following steps: rough machining of the nickel steel-containing sample, fine polishing after polishing and erosion, surface cleaning after fine polishing of the sample, and the sample for the EBSD analysis is obtained; the fine polishing process comprises the following steps: diamond suspension liquid is used for polishing the sample after polishing and erosion, and aluminum oxide suspension liquid is used for polishing the sample. Special sample preparation links are reduced for facilitating implementation; the fine polishing process can relieve stress; compared with the conventional polishing method, the method has the advantages of simplicity, saved time, reduced sample preparation cost, and improved sample preparation efficiency, and the sample has a high desorption rate which can meet the requirements of EBSD analysis. The method has high operability, so that sample preparation is simple and timesaving, and preparation efficiency of the sample is improved. The sample for the EBSD analysis has a high desorption rate and good stability, the calibrate rate of the sample reaches 90% or above, general demands are satisfied, and the effects are good.

The invention discloses an observation aid for high-temperature laser scanning confocal microscope samples and a using method thereof. The aid comprises a seat body, bolts and a wafer sample, whereinthe seat body is cylindrical; a plurality of through threaded holes are circumferentially and uniformly formed in the seat body; the bolts are meshed in the threaded holes; the bolts are formed by topping and grinding traditional bolts; placing grooves are formed in the top surfaces of the bolts; and wafer samples are fixedly connected in the placing grooves. The using method comprises the steps of sample mounting, sampling grinding and sample observation. The observation aid has the following beneficial effects that the cylindrical seat body is easy to be handheld for polishing, so that the grinding and polishing of multiple wafer samples at one time are convenient and benefit is brought to improve the surface quality and flatness of the wafer samples; and the fingers are prevented from being in direct contact with the samples and the wafer samples are easier to be uniformly stressed in the grinding process, so that the thickness uniformity of the samples is ensured. The aid is capable of observing the surface grinding corrosion conditions of multiple samples at the same time under a high-temperature laser confocal room-temperature microscope.

The invention relates to a soil cutting device for accurately obtaining non-rhizosphere soils at different distances from rhizosphere. A circular root box soil block tray device, a soil block locating lead screw device, a blade regulating device, an adjustable-speed motor switch and the like are arranged on a bracket, the bottom of a circular tray is connected with a rotating shaft of an adjustable-speed motor, anti-sliding soil block stop sheets are circumferentially uniformly distributed on the edge of the circular tray and fixed by soil block locating bolts; a first hand wheel in the soil block locating lead screw device and the upper end of a first lead screw are welded together; a second hand wheel in the blade regulating device and the upper end of a lead screw are welded together, the lead screw is matched with a thread on an auxiliary blade holding frame, the auxiliary blade holding frame is connected with a blade holding frame through a third lead screw, one end of the third lead screw and a third hand wheel are welded together, a blade is fixed on the blade holding frame; a first lead screw locating block in the soil block locating lead screw device is sleeved on the first lead screw and is connected with a bracket main cross beam bolt; the first lead screw is concentric with the rotating shaft of the adjustable-speed motor, and the blade regulating device is fixed on the lead screw.

The invention discloses a device and a method for preparing coal samples with different water contents. The device comprises a thermostat, wherein a water tank and a coal sample tank which are connected through a pipeline are arranged in the thermostat; an electromagnetic oven is arranged on the lower part of the water tank; the water inlet of the water tank is connected with a water adding device; a balance is arranged on the lower part of the coal sample tank; the coal sample tank is connected with a vacuum pump through a pipeline; the thermostat, the electromagnetic oven, the balance and the vacuum pump are connected with a control system through data lines respectively. The device is capable of directly testing the water contents of the coal samples, humidifying the coal samples through the test data set by a computer, and controlling the various components through the control system when the coal samples achieve the requirements of the test data, and thus preparing the needed coal samples; in the way, the technical problem of control of an experiment on the different needs of the water contents is solved, the sample preparation efficiency can be increased, and the sample preparation accuracy requirements can be met.

The invention relates to the technical field of soil sample preparation, in particular to a soil sample preparation system. The full-automatic soil sample preparation system comprises a crushing and grinding mechanism, a screening mechanism, a sample loading mechanism, a manipulator and a cleaning assembly, wherein the crushing and grinding mechanism is used for grinding a soil sample; the screening mechanism is used for screening the ground soil sample; the sample loading mechanism is used for carrying out quartering sample loading on the screened soil sample; the manipulator is used for transferring the soil sample; and the cleaning assembly is used for cleaning a container accommodating the soil sample. The full-automatic soil sample preparation system realizes automation of the soil sample preparation process, effectively avoids the cross contamination of samples, improves the sample preparation environment, reduces the labor intensity, and improves the sample preparation efficiency; and the process operation of the full-automatic soil sample preparation system has compliance consistency, and full-process automation of soil sample preparation is realized.

The invention discloses a sample preparation system. The system comprises a pretreatment module, a total-moisture sample preparation module, a for-future-reference sample preparation module and an analysis sample preparation module which are arranged side by side. A travelling track is arranged in parallel with the pretreatment module, the total-moisture sample preparation module, the for-future-reference sample preparation module and the analysis sample preparation module. A discarded material storage module is located at one side of the tail end of the travelling track, and a packaging module is located at the other side of the tail end of the travelling track. The travelling track is provided with an industrial robot which can rotate and stay at any module to conduct grabbing and releasing operation. By means of the sample preparation system, the freedom degree and the number of joints of a mechanical arm are decreased; cost of the sample preparation system is greatly lowered; and in addition, subsequent maintenance work can be conducted conveniently.

The invention discloses a sampling quantification method for analyzing the granularity of diamond micro-powder. The method comprises the following steps: taking a diamond micro-powder reference sample with the average particle size of d1, and carrying out multi-time measurement through adopting a laser particle analyzer or a resistance particle analyzer to determine an optimum sampling amount m1 for the granularity analysis of the sample; and detecting a diamond micro-powder sample-to-be detected with the average particle size of d2 through adopting the same laser particle analyzer, determining an optimum sampling amount m2 for the granularity analysis of the sample-to-be-detected from the optimum sampling amount m1 of the diamond micro-powder reference sample according to the following formula: m2 = (m1*d2) / d1, and analyzing and detecting the granularity of the diamond micro-powder sample-to-be-detected. The sample be rapidly made through the formula determined by the method right the first time, so the sample making efficiency is greatly improved, sample making standards are standardized, and the accuracy and the stability of a test result are improved.

The invention belongs to the field of hard clay sampling, and particularly relates to a hard clay undisturbed three-axis sample preparation device and a using method thereof. The device comprises a support, wherein a base is arranged at the bottom of the support; a bottom plate is arranged on the base; a lower fixing disc is arranged in the middle of the bottom plate; an upper fixing disc is arranged at a position above the lower fixing disc; the upper fixing disc is connected with a guiding rod; the guiding rod penetrates through a tool cap; the tool cap is connected with a hollow spiral tool; the tool cap is in threaded connection with a feeding guide track; the feeding guide track is a threaded rod, penetrates through the top of the support and then is connected with an output end of a stepping motor; and the stepping motor is positioned on the top of the device and is controlled by a controller. The hard clay undisturbed three-axis sample preparation device is skillful in structural design; the size and perpendicularity of a soil sample can be controlled accurately; success rate of soil sample preparation is high; sample preparation time is saved; the sample preparation efficiency is greatly improved; and the business application value is high.

The invention discloses an automatic rock-like sample stirrer capable of preventing dust and uniformly stirring and a stirring method. The stirrer comprises a support for supporting and fixing a cylinder body; a pressurizing / pressure-relieving valve is arranged at the top of the cylinder body; a rotating shaft is mounted on the central axis of the cylinder body; the upper end of the rotating shaftis connected with an output shaft of a rotating motor; a stirring device and a threaded stirrer are fixed to the rotating shaft from top to bottom, the inclination direction of fan blades of the threaded stirrer is opposite to that of the stirring device, a solid storage hopper is arranged at the top of the cylinder body, an annular nozzle is installed on the inner wall of the cylinder body between the threaded stirrer and the stirring device, a discharge port is formed in the bottom center of the cylinder body; and a solid particle electric control sensor is arranged at a position, close tothe stirring device, in the cylinder body. According to the stirrer, dust is prevented from escaping, the stirring uniformity can be improved in the stirring process, powder lumps are prevented, automatic integration of feeding and stirring is achieved, the sample preparation efficiency and precision are improved, sample residues are reduced, and the sample quality is guaranteed.

The invention provides a cotton fiber opening device, and belongs to the technical field of spinning material detecting devices. The cotton fiber opening device comprises a box provided with a feedinginlet, an opening mechanism arranged at the rear side inside the box and used for opening cotton balls into cotton fiber, a cotton blending mechanism arranged at the front side inside the box and used for blending the opened cotton fiber and carding the cotton fiber in order, and a power mechanism arranged at the bottom side or lateral side of the box and used for supplying power to the opening mechanism and the cotton blending mechanism. The opening mechanism opens cotton fiber to be detected and conveys the cotton fiber to the cotton blending mechanism, the cotton blending mechanism cards and mixes the opened cotton fiber into smooth and orderly thin cotton pieces to be drafted, convenience is provided for the follow-up sample preparation procedure, the cotton fiber opening device integrates opening, carding and blending, damage to the cotton fiber in the opening process is small, the cotton fiber is not lost, the sample preparation time is short, and the sample preparation and detection efficiency is improved.

The present invention relates to a monitoring equipment for preparing fluid sample at low temperature and its method. Said equipment mainly includes the following several portions: low-temperature refrigeration unit formed from low-temperature sample making target, liquid nitrogen container, corrugated pipe and rubber pipe; low-temperature control unit composed of flushing valve, safety valve, controller, heater and computer monitoring system; and object-phase non-contacting device of low-temperature detection unit formed from optic fibre sensor, temperature sensor, photoelectric multiplier and computer monitoring system.

The invention discloses an automatic water-quality sampling control method and system. The method comprises the steps of receiving target concentration and an allowable error range of a prepared sample and solution concentration of a standard solution, judging values of the target concentration and the solution concentration, generating a sampling instruction of conducting dilution or concentration sampling processing on the standard solution according to the judgment result, sending the sampling instruction to a water-quality sampling device to control the water-quality sampling device to conduct sampling processing, receiving actual detection concentration of the solution after sampling processing; judging whether the difference value of the actual detection concentration and the target concentration is in the allowable error range, if the answer is positive, the prepared sample is qualified, and otherwise, the sampling instruction is sent again. Automatic on-line sampling of the water-quality sample is achieved, the water-quality sampling device is automatically calibrated by measuring the actual concentration of the prepared sample reversely in the sampling process, and therefore, the following sampling precision is reliable and the sampling efficiency is improved.

The invention relates to a sample preparation method for mechanical performance testing of pre-oxidized fibers, comprising the following steps: 1) winding the fibers to be tested on a support with certain tension, wherein the support comprises two bottom bars and two support bars vertically arranged between the two bottom bars; the fibers to be tested are wound between the bottom bars; and the two ends to be tested are respectively fixed on the bottom bars; 2) placing the support on which the fibers to be tested are wound in a container with epoxy resin glue solution, impregnating the fibers to be tested in the epoxy resin glue solution wholly for 1-8min, taking out the fibers and gently oscillating the support; 3) drying the fibers to be tested after being impregnated in the glue; and 4) cooling the dried fibers to be tested and cutting off the carbon fibers to be tested between the two bottom bars, thus obtaining the prepared sample. The method solves the technical problem that the existing sample preparation methods are complex and can not ensure the accuracy of the testing result and improves the efficiency of sample preparation for mechanical performance testing of pre-oxidized fibers and uniformity of sample impregnation.

The invention discloses a PRTV coating testing sample preparation die and a sample preparation method thereof. The PRTV coating testing sample preparation die comprises a die body, a die outer edge, an outer disc and multiple sample preparation grooves positioned in the undersurface of the outer disc, uniformly distributed along the center of the outer disc and close to each other are arranged onthe die body, the die outer edge is higher than the surface of the outer disc, at least three sample preparation grooves are formed, cross section of each sample preparation groove is round, and the cross sections of the sample preparation grooves are identical. By the PRTV coating testing sample preparation die, efficient and standard sample preparation of a PRTV coating can be realized; the dieis uniform in coating sample preparation thickness, low in defective rate and good in practical effect, and samples prepared by the die are free of adhesion with the die.

The invention discloses a sampling device of geosynthetics biaxial tensile test. The sampling device comprises a punching machine main body with a punch and a punching platform, wherein the lower partof the punch is detachably connected with a loading plate and a punching plate; a bottom plate is arranged on the punching platform; a mould is placed on the bottom plate; the mould comprises a mouldbottom plate; cutter blades matched with the shapes of test samples are detachably arranged on the mould bottom plate. According to the sampling device of geosynthetics biaxial tensile test, any testsamples which are in complicated shapes can be accurately, quickly and effectively manufactured, and the applicable material range is wide. By utilizing a punching principle, once-forming is realized, and under the premise of ensuring the precision of the shapes and the sizes of the test samples, outlines of the test samples are ordered and smooth without any gaps or rough selvedge.

Disclosed is a method for measuring dislocation density of steel through the electron back-scattered diffraction (EBSD). The method includes preparing standard samples and a plurality of to-be-testedsamples, sequentially placing the samples in an scanning electron microscope with the EBSD, scanning the samples and recording scanning data, processing the scanning data, determining interfacial density Pi(standard) of small-angle interface of the standard sample and interfacial density Pi of small-angle interface of the to-be-tested samples, measuring dislocation density d (standard) of the standard sample, calculating the constant k by the formula d(standard)=k*Pi(standard), and then calculating the dislocation density of the to-be-tested samples by the formula d=k*Pi. Compared with the other conventional method for measuring dislocation density, the method is much convenient and accurate, and can measure and compare the dislocation density of different steel products visually.

The invention provides an EBSD sample making method. The method includes: sample making, wherein a preset-size test is made from sample raw-material, and a to-be-tested surface of the test sample is polished; and heat processing, wherein the test sample after sample making completion is placed in vacuum airtight equipment capable of temperature control, heat processing is carried out according topreset technology, and the sample is used for an EBSD test after heat processing completion. Through the method, a sample making process and time can be shortened, sample making costs can be reduced,sample making efficiency can be improved, calibration rates of IPF graphs in EBSD tests can be significantly improved at the same time, and a highest calibration rate can reach 99%.

The invention discloses an automatic sample preparation system with a parallel processing function. The automatic sample preparation system comprises a first-stage processing unit, a second-stage processing unit and a third-stage processing unit which are used for preparing samples, wherein the first-stage processing unit is used for carrying out sample preparation to respectively obtain a total moisture sample and a first to-be-sample-prepared material which is to be processed by the second-stage processing unit; the second-stage processing unit is used for carrying out the sample preparation on the first to-be-sample-prepared material to respectively obtain a finding-storing sample and a second to-be-sample-prepared material which is to be processed by the third-stage processing unit; the third-stage processing unit is used for carrying out the sample preparation on the second to-be-sample-prepared material to obtain an analyzing sample. The automatic sample preparation system has the beneficial effects that the operation is convenient and flexible, each sample preparation unit is processed in parallel, three types of samples of different specifications can be simultaneously prepared, the automation degree of the sample preparation is extremely high, the labor intensity is greatly reduced, and the sample preparation efficiency is greatly improved.

The embodiment of the invention discloses a wafer failure analysis method, which comprises the steps of determining a target test area in a cutting channel of a wafer, the wafer comprising a driving wafer layer and an array wafer layer which are stacked, wherein the array wafer layer comprises a stacking layer located on the driving wafer layer and a substrate located on the side, deviating from the driving wafer layer, of the stacking layer, and the target test area comprises a through contact penetrating through the array wafer layer and a test structure formed in the driving wafer layer andlocated below the through contact; performing protection processing on the surface of the through contact to obtain a wafer after protection processing; etching the substrate, located in the array wafer layer, in the wafer after the protection processing to obtain a wafer after the etching processing; and performing failure analysis on the wafer after the etching processing.