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TDI Line Scan Cameras

World‘s First Hybrid TDI Sensors – 3200 x 128, 4640 x 256, 6560 x 256 pixels

Time Delayed Integration Technology

The VT series of Vieworks Time Delayed Integration line scan cameras are designed for applications where faster line rates and higher sensitivity are critical, e.g. in low light
conditions. The Vieworks advanced TDI line scan technology is based on the outstanding hybrid imaging sensors that allow image captures as fast as the 100 kHz line rates, with up to 256× higher sensitivity..

With high speed and high sensitivity, this TDI technology is ideal for demanding applications such as flat panel display inspection, wafer inspection, printed circuit board inspection and high-performance document scanning.

Performance Features

  • Time Delayed Integration with up to 256 TDI stages
  • line rates up to 125 kHz
  • Bidirectional operations
  • Triggering of each line exposure during the TDI process
  • Binning: horziontal (1x2), vertical (2x1), or combined (2x2)
  • Region of Interest (ROI)
  • Number of active TDI stages selectable, e.g. 64 / 128 / 192 / 256
  • Area imaging for alignment

Time Delayed Integration Technology in Principle

The principle of TDI technology is based on the timeshifted multiple exposure of a moving object. The sensor is composed up to 256 line sensors arranged in parallel.

At the end of one exposure period, the accumulated charges in that line sensor are shifted to the next line (see figure, right). During the next exposure period, new charges are acquired, added to the already existing charges and the new sum is again shifted to the next line. Finally, after 256 exposures, the sum of all lines is output as a video signal.

Synchronous transport of a scanned object across the field of the camera actually produces a 256-fold multiple exposure. For each exposure period, the object has moved far enough that the next sensor line is not only ready for exposure but has also already been filled with the accumulated charges from the previous sensor line(s).

Schäfter + Kirchhoff GmbH - specialists for optical sensors and measurement technology
Kieler Str. 212, D-22525 Hamburg, Tel. +49(0)40 85 39 97-0, Fax +49(0)40 85 39 97-79
E-Mail info~at~SuKHamburg.de