RHEED Data Acquisition and Processing Software SAFIRE

SAFIRE is a powerful and easy to use RHEED evaluation software. It combines sophisticated evaluation algorithms with extensive opportunities for data representation and documentation. It can handle an arbitrary number of parallel measurements and offers fast real-time data exchange with MBE controller for closed feedback loop operation.

Multiple measurements can be stored in the same display for comparison. The temporal resolution in all measurement modes is 20 ms, Kikuchi line analysis, azimuthal scans, integration with 16 bit resolution and on-chip-integration keep you at the forefront of RHEED research.

Highlights:

SAFIRE combines the user interface and the easy use from Windows® application with the live display of the camera picture on the same screen.

The number of sensors and the data acquisition period is only limited by the hardware. One-, two- and three dimensional data can be acquired simultaneously and at individually different time intervals. SAFIRE's multitasking concept allows you to start or stop measurements while others are running, or to analyze your data while the measurement is running. The possibility to generate Tiff format screen-shots at any time, even during the measurement, puts you in control of the data. On-chip as well as software integration, 16 bit internal resolution and A/D reference scaling lets you pick up even weakest signals.

SAFIRE combines the power of a high-end system with the easy of use needed for everyday tasks like growth rate calibration. It's continuously growing processing module library keeps you abreast with the latest developments in RHEED research.

Download your SAFIRE VIDEO RHEED Image Processing Application Note(PDF)

Technical Data:

• Arbitrary number, shape and size of areas of interest (sensors)
• 40 ms acquisition rate, 20 ms mode in preparation
• On-chip integration for minimum noise at low signal levels
• Fast bi-directional digital/analog signal bus to EMERALT MBE controller
• Multitasking technology for independent parallel measurements
• Extensive triggering capabilities
• Pre-trigger for easy adjustment and recording of data before measurement starts
• Multiple repetitions of measurement stored in the same data set for easy comparison and parallel evaluation
• Continuously growing library of processing and fitting algorithms:
  • Lattice constant determination
  • FWHM of reflections as a function of time
  • Fourier transforms in space and time
  • Integration in space and time for reduction of dimensionality
  • Slicer to extract data
  • Kikuchi line analysis
  • Full length and running average sine fit
  • Azimuthal scan for LEED-type cuts through reciprocal space
• Integration of Oxford RHEED Gun for automated control of all beam parameters
• High resolution, high speed camera

Hardware Specifications:

A/D-D/A Converter-Board PCI

• Type: BMC- PCI-BASE 300 High speed
• Resolution: A/D 16 BIT min. : D/A 16 BIT min.
• Speed: 333 kHz 2d2"
• Voltage: A/D range +/- 1, 2, 5, 10V and 0-5V: D/A range +/- 5, 10V
• Input: A/D 16, D/A 2
• Digital-I/0 implement
• TTL Input: 16, TTL Output: 16
• Energy steps: at energy ramp 0-3000 eV in steps of 0,04 eV.
• FIFO: 4 kByte
• Rel. accuracy in the measuring ranges: 0,0015 %.
• Converter rate: 10µs.
  

  Capture-Board AGP:
  

• Type: ASUS AGP-V6800 Deluxe
• Speed: ASUS LIVE Real-time 30 fps 704 x 480 video capture
• Driver CD: Windows 98, Windows, Microsoft DirectX driver, GART driver, interactive products tutorials
• Powered by GeForce256 DDR GPU
• 300MHz video memory
• RAM: 32 MB DDR Video Memory
• Remark: High speed 30 fps by Windows 98 only realize
• Image: 4:3 (4 horizontal : 3 vertical)
• Solution: 8 BIT (256 gray scale) with full pixels image 4:3
• Transmission: more than 2 Mbytes/sec. (optimal Computer configuration)
• Video in: 1 x SVHS non compression, 1 x Cinch non-compression
• Video out: 1 x SVHS, 1 x Cinch
• VGA: 1 x SUB-D Monitor
• 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:

• 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
• Real-time integration and imaging
• On-line (on/off) background subtraction
• Signal averaging
• 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)
• Gray- and colour-look-up-table
• R-factor-comparison (Pendry and R2)
• Software video recorder for subsequent analysis of I (t) measurements
• Control of RHEED-, other power supplies and control of experiments
• Easy to use by mouse or menu
• Data processing, addition, subtraction, multiplication, division -of numbers and spectra-, differentiation, integration and background subtraction, FWHM measurement
• Data output in standard ASCII / Tiff / Bitmap format and on HP laser printer and HP video printer
  

CCD-Camera:

• High Performance, low-light near-infrared CCD-camera, with lenses, manual and automatic gain control, including power supply

• Image area is 6.4*4.8 mm
• 795x596 Pixels, 48dB S/N-ratio,
• Resolution 600 lines (horizontal)
• Sensitivity (min detectable signal at sensor): 0.02 Lx.
• Compatible with the RHEED screen (phosphor coated glass screen)
  

Options:

• VCR, amplifier, Peltier-cooled CCD-camera and video printer

Download your SAFIRE VIDEO RHEED Image Processing System Brochure (PDF)

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