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Stereoscopic Width Gauge DigiScan XD4000, designed for installation above
the mill roll tables in hot strip and plate mills and cold rolling mills,
is state-of-the-art technology for measuring the width of strip / plate
products. For use at the roughing mill or finishing mill exit, the self-emitted
optical radiation of the hot strip provides sufficient contrast for width
determination. An optional backlight mode is available for installation
at the entry to the coilers or when the rolling temperatures are below 600?C.
Main features
- Two digital CCD cameras with 4096 pixels each and high-quality
multi-lens optics, mounted on a precision optical bed in stereoscopic
vision;
- Advanced edge detection software and data capture processor
to perform edge sensing in real-time at 1000 Hertz;
- 40MHz High Speed digital camera;
- High speed CPU executing digital filtering algorithms
to determine edges location with sub-pixel accuracy and to calculate
product width;
- Simplicity of installation and maintenance;
- Very quick change of sensor head;
- Compact water cooled sealed die-cast aluminium housing;
- Modular architecture allowing easy extension and implementation
of effective solutions with end users;
- Client Server architecture with multiple displays on
a network;
- Remote dial up Access Service through network for trouble
shooting;
Laser line pointer for easy commissioning;
- Self emitted or back light mode;
- Optional features include – Thermal profile for
self emitted Gauges;
Operating principle
The core of the DigiScan XD4000 consists of proprietary software operating
on a high performance frame grabber and two 4096 pixel CCD (Charge Coupled
Device) high performance digital cameras.
DELTA Stereoscopic Width Gauge employs an advanced digital edge detection
process that captures the digitized camera data. Software routines running
on the high speed embedded processor perform sub-pixel edge determination
in two dimensional space.
The camera data are filtered using a high-speed Infinite Impulse Response
(IIR) digital filter. Sub-pixel edge locations are then determined based
on the second derivative of the pixel data. With two sub-pixel edges
from each camera, the true width of the material is calculated using
geometric triangulation. These trigonometric functions allow very accurate
width measurement in spite of the influences of material pass line variations,
thickness variations and flutter.
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