Geoscan IV Linescan Imaging

Calibrated Colour Core Imaging System

Visual core record
Immediate imaging of cores after they are split preserves an invaluable archival record of each core section prior to any oxidation effects. Precise depth-registered images can be correlated with other data sets or used when describing core.

True colour separation
The Geotek GEOSCAN IV line scan camera has 3 CCDs (2048 pixels each) and splits and filters the incoming light into three non-overlapping channels of red, green, and blue for true colour separation. Averaged image data can be converted to these RGB values and saved in a separate file to facilitate quantitative comparisons between cores and other down-core measurements.

Line-scan imaging
Single lines of image data are collected sequentially down the core. Line-scan images are far superior to area camera images because they do not suffer from uneven lighting, spherical distortion, montage or “stitching” effects. The entire image is suitable for calibrated sub-millimetre image analyses.

High, higher, highest resolution
Images can be collected at 100, 200 or 400 lines per centimetre, corresponding to 100, 50 and 25 micron pixel sizes, respectively. Images are output as 48-bit RGB TIFF images but are quickly and easily converted to JPEG or other formats as required. Each Geotek core section image has a companion XML metadata file, containing important information pertaining to the core section and imaging conditions. A ruler can be generated next to the image, depicting either depth in core section or depth in core.

Calibrated measurements
The camera is factory-calibrated and a standard photographic 18% grey card is used for field calibration, enabling images to be qualitatively or quantitatively compared to each other.

Core imaging speed

The normal scan time for standard (50 micron) resolution is 3 minutes per metre. Scan time doubles to 6 minutes per metre for highest (25 micron) resolution.

Applications

  • Stratigraphic correlation
  • Core archiving
  • Core quality assessment
  • Spectroscopy
  • Mineralogy

Camera Specifications

  • Pixel sensors: 3x 2K with dichroic colour separation prism
  • Sensor dynamic range: 6000:1
  • ADC resolution: 14 bits per colour channel
  • Sampling: Correlated double sampling with exposure control
  • Max pixel rate: 2M pixels/sec
  • Max scan rate: 1K lines/sec
  • Down core resolution: Up to 25 microns
  • Cross core resolution: Dependent on camera height
  • User controls: Analogue offset and gain
  • Data transmission: Gigabyte ethernet interface
  • Lens: Nikon lens mount

For further information please Contact Us.

MSCL Systems