Scanning Electron Microscope

Product Description

Product Description
SpecificationModelSEM2800BSEM2800BZSEM2800ASEM2800AZResolution4.5nm (30KV)Magnification15X ~ 250, 000XElectron gunTungsten cathodeAccelerating voltage0 ~ 30KVLens systemThree electron magnetic lens systemObjective lens apertureThree apertures selectableSample stageManualX/Y AutomaticManualX/Y AutomaticTravelX0 ~ 50mm, 0 ~ 80 selectableY0 ~ 50mmZ0 ~ 25mm, 0 ~ 30mm selectableR360oT-5o ~ 90o, 0o ~ 90o selectableDetectorSE detectorVacuum systemDiffusion pumpDiffusion pumpMolecular pumpMolecular pumpDetails and FeaturesFeatures: Electron Optics System Electron gun The type of electron gun: ★(1)FEG (Field Emission Gun ) ★(2)W filament(Tungstenfilament gun ) Tungsten filament gun works ★3 pole hair fork-tungsten cathode electron gun ★Self-bias, bias resistor adjustable★Added to between the gate and the anode , a continuously adjustable from 0 to 30KV negative high voltage ★providing a tinyhigh-brightness electron source and obtaining a stable high-brightness beam. ★Mechanical alignment system Electromagnetic beamalignment system Condenser lens Objectives lens ★Lens is used to focus images ,its Structure is a more specific .It accommodatesscanning coil and elimination astigmatism component,to effectively reduce the sample's surface magnetic field ;aperture is on thetop of lower pole shoes,so that beam spot size down to focus on the minimum size of the sample . The vertical distance from lowerpole shoes to sample surface is called the working distance -WD ★Requires a long working distance, a low spherical aberrationcoefficient and a small magnetic flux leakage. Eliminate astigmatism ★As the processing error, or a winding core in thenon-uniform magnetic field asymmetry which can damage the magnetic lens symmetry ,so that it makes an oval beam spot into a spotinstead of the standard round spot .It is called astigmatism . ★Eliminate astigmatism correction is used to provide a weak fieldon the image astigmatic correction. ★Eliminate astigmatism in the scanning device mounted inside the coil components. ★There areX, Y pairs of images in both directions for a more positive astigmatism. Scanning coils ★Using X, Y two directions of magneticdeflection coil. Electron beam scans the sample was raster-like .That is, X direction of scan (line scan) and the Y direction ofscan (frame scanning). ★SEM was taken point by point imaging method , Tube of the electron beam scanning and display the scanningelectron beam is strictly synchronous ,therefore, the image on the display screen is a enlarging image scanned on the sample area. ★Magnification of scanned images is determined by the current flowing through the coil, the larger the current, the greater theangle of scan, then the lower image magnification. In a given scan angle, the working distance increases, the lower magnification.Specimen chamber ★The specimen chamber installed in the vibration-isolation frame, Electro-optical tube installed in the top ofthe specimen chamber, Vacuum system is installed below the specimen chamber. ★Specimen stage from the front door into the specimenchamber, specimen chamber deflation does not affect the vacuum tube. ★Chamber provides a large space, but also to annex to installconvenience. ★Specimen stage is so large enough range of movement that it can be used to observe a large specimen. ★Specimen stageto carry out a five-dimensional movement: X, Y, Z, rotation, tilt, etc. ★Specimen stage has sufficient machining accuracy toachieve micron-level mobile. Signal reception processing and display system ★Electronic signal from the specimen out through thegrid into the detection system. When the grid added +300 V, it can effectively collect low-energy secondary electrons, when thegrid added-100V voltage, collecting less than a secondary electron. However, due to higher energy backscattered electrons arestill part of the direct scintillator was collected. So when the grid with 300V, the read secondary electron image. When the gridadd-100V, the probe can be observed backscattered electron image. ★10KV high voltage conductive layer increases, the purpose is toimprove the detection efficiency. Accelerated the secondary electrons hit scintillator to generate photoelectron, Thephotoelectron through the tube to the photomultiplier tube ,Photomultiplier tubes transform light signals into electrical signals,Via pre-amplifier , a weak electrical signal will be amplified and sent to video amplifier, Then the output sent to the image onthe imaging system. ★Image output mode: Monitors to observe or photograph. Magnification ★When the incident electron beam toraster scan ,If the electron beam scans the specimen surface, the magnitude of As, In the cathode-ray screen simultaneously scanamplitude Ac, The SEM magnification as follows: M=Ac/As ★Resolution ★SEM resolution is the main performance index. In terms ofmicro-area composition analysis, it refers to sub Analysis of the minimum zone; Right image, it is the means to distinguishbetween a minimum distances between two points. Resolution size is determined by the incident electron beam diameter and the typeof joint decision-modulated signal. Electron beam diameter, the smaller the higher the resolution. However, the physical signalfor the imaging is different, For example, secondary electron and backscattered electron, in the launch of the scope of thespecimen surface is not the same, thus affecting its resolution. General secondary electron image resolution is about 5-10nm,backscattered electron image resolution of about 50-200nm. Computer and software systems ★It is a part of the electrical control.★Automation and intelligence is an important characteristic of modern instruments. ★Make the operation of electronic microscopeconvenient. ★To achieve office network and automation. Vacuum system ★Provide vacuum which electro-optical system requirements★Vacuum systems include: Mechanical vacuum pumps and high vacuum pumps, vacuum 3.alves, vacuum vibration-isolation, vacuummeasurement, Etc.Our CompanyPacking&DeliveryPacking Packaging Details1. The equipment is covered with film is protect it from water vapour during the trip. 2. The box is filled with foam to protectthe equipment from impact. 3. Exported wooden box made from plywood, don't need fumigated.PaymentPayment Term T/TEXW 30% T/T in advance, paid the balance before shipmentFOBCFR(C&F) 30% T/T in advance, paid the balance against copy of B/LCIFL/CL/C amount above 50,000 usd, we can accept L/C at sightWest UnionAmount lower than 5000usdDelivery Time7~10days after receiving payment for one containerContecting UsTina ZhangWebsiteMobile Phone+8613866784390WhatsApp+8613866784390Skypesales03@anytester.comWechat+8613866784390