OCI Vacuum Microengineering

LEED IMAGE ANALYSIS SYSTEM

Model LIM08

Contains low light integration CCD camera, frame grabber, and ambient light cover

Features

  • Integrated image acquisition and beam energy control on regular and zoomed images
  • Measurements on "live" or "saved" images
  • Lattice constant calculations
  • Spot Intensity profile with fine adjustment
  • Manual and automatic I-V measurements
  • Subtraction and addition of images
SPECIFICATIONS

 

ACQUISITION

  • LEED pattern viewing with instant beam voltage control and integration time at zoom x1, x2, x4 or x8
  • control of the integration time of CCD camera up to 2 sec. for low intensity images
  • automatic LEED pattern acquisition to the hard disc for pre-set range of electron beam voltages
  • video input conditioning
  • calibration of digital to analog converter (DAC) to control beam energy via LEED power supply

 

MEASUREMENTS AND PROCESSING

  • spot intensity and x-y position measurements at cursor position on live LEED pattern
  • lattice constant and angle calculation for selected diffraction spots with pre-set LEED instrument parameters
  • intensity profile plotting
  • setting the (0,0) spot position for normal electron beam configuration
  • manual I-V plot calculation with background subtraction for set of saved LEED pattern with zoomed spot viewing
  • automatic I-V plot calculation with background subtraction on saved or live LEED patterns
  • automatic I-T measurements for live LEED patterns
  • automatic spot profile measurements during I-V analysis
  • reliability R- factor calculation
  • adding two images and subtraction
  • image zooming (x2, x4 and x8)
  • sequential image saving and retrieval

 

GENERAL

  • Windows 98/NT/2000/XP operating system
  • beam energy value saved to each LEED pattern
  • automatic memorization of last operator settings
  • images saved in Windows bitmap format
  • measurements saved in ASCII text file format
  • writing text on the image

 

HARDWARE SPECIFICATIONS

Camera

  • monochrome CCD camera with high spatial resolution 752x582 pixel (horizontal/vertical)
  • ½-inch size CCD sensor with 8.4 x 9.8 microns
  • field integration control from software for very high sensitivity
  • power: +12 V DC from computer
  • lens mount: C type, one set of lens to fit LEED screen size and distance
  • camera holder for 6"(CF100) or 8" (CF150) CF flange amount with adjustable position

Frame Grabber

  • digitizing window 752x582 pixels with 8 bit intensity scale resolution (256 values) and PCI port

DAC

  • 16 bit digital to analog converter with 0-5V or 0-10V output and output calibration,
  • PCI mount

Computer (minimum specs)

  • Pentium III/IV, 128 MB RAM, 10 GB Hard Disk or better