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VIDEO LEED Systems - Image Processing
VIDEO LEED (AIDA PC) and VIDEO-RHEED
All the benefits of VIDEO LEED systems plus Automatic Image & Data Acquisition
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Suitable for LEED, RHEED and other applications using a video signal
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Real time measurement of I (V) - and I (t) - curves
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Measurement of profiles in any direction
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Comprehensive image processing
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Easy to operate by menu and mouse control
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Can be used with any LEED optics and RHEED gun
AIDA PC Technical Specification
Computer Hardware
A/D-D/A Converter-Board PCI
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Type: BMC- PCI-BASE 300 High speed
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Resolution: A/D 16 BIT min. : D/A 16 BIT min.
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Speed: 333 kHz 2d2"
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Voltage: A/D range +/- 1, 2, 5, 10V and 0-5V: D/A range +/- 5, 10V
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Input: A/D 16, D/A 2
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Digital-I/0 implement
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TTL Input: 16, TTL Output: 16
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Energy steps: at energy ramp 0-3000 eV in steps of 0,04 eV.
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FIFO: 4 kByte
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Rel. accuracy in the measuring ranges: 0,0015 %.
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Converter rate: 10µs.
Capture-Board AGP:
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Type: ASUS AGP-V6800 Deluxe
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Speed: ASUS LIVE Real-time 30 fps 704 x 480 video capture
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Driver CD: Windows 98, Windows, Microsoft DirectX driver, GART driver, interactive products tutorials
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Powered by GeForce256 DDR GPU
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300MHz video memory
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RAM: 32 MB DDR Video Memory
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Remark: High speed 30 fps by Windows 98 only realize
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Image: 4:3 (4 horizontal : 3 vertical)
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Solution: 8 BIT (256 gray scale) with full pixels image 4:3
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Transmission: more than 2 Mbytes/sec. (optimal Computer configuration)
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Video in: 1 x SVHS non compression, 1 x Cinch non-compression
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Video out: 1 x SVHS, 1 x Cinch
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VGA: 1 x SUB-D Monitor
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Peak fill rate of 480 million bilinear filtered, multi-textured pixels and more than 3.8 gigatexels per second. Up to 15 million triangles per second at peak rates. 32 Bit Z and stencil buffer.
Computer
Software:
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Windows® 98/2000/NT compatible software, 32 bit
Real-time measurement of intensities of spots as function of energy i.e. I(V)-curves, I(t) measurements, R-factor analysis, of time oscillations, temperature and other parameters. Data analysis can be carried out either directly or from saved images and profile measurement (line scan). The I/V spectra can be either normalized with the beam current or not. -
8 windows for intensity measurement (free selectable in position and size), 18 spots tracking
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Real-time integration and imaging
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On-line (on/off) background subtraction
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Signal averaging
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Automatic maximum location of single spots Automatic window tracking (I/V-curves)
Profiles (line scans) in any direction or dimension -
Measurement of up to 8 external parameters (i.e. primary current, temperature, pressure, energy)
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Gray- and colour-look-up-table
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R-factor-comparison (Pendry and R2)
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Software video recorder for subsequent analysis of I (t) measurements
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Control of LEED-, RHEED-, other power supplies and control of experiments
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Easy to use by mouse or menu
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Data processing, addition, subtraction, multiplication, division -of numbers and spectra-, differentiation, integration and background subtraction, FWHM measurement
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Data output in standard ASCII / Tiff / Bitmap format and on HP laser printer and HP video printer
CCD-Camera KAM 02
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High Performance, low-light near-infrared CCD-camera, with lenses, manual and automatic gain control, including power supply
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Image area is 6.4*4.8 mm
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795x596 Pixels, 48dB S/N-ratio,
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Resolution 600 lines (horizontal)
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Sensitivity (min detectable signal at sensor): 0.02 Lx.
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Compatible with the RHEED screen (phosphor coated glass screen)
Options
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VCR, amplifier, Peltier-cooled CCD-camera and video printer
VIDEO LEED (AIDA-PC) graphical user interface during a line scan through the LEED pattern of a C(2 x 2) O / Ni (100) superstructure.
The intensity versus location curve represents the measured profiles of the diffraction spots along the vertical line through the center of the diffraction pattern.
The Applications Notes also contain examples of AIDA PC display capability.