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Addressing demanding imaging needs with TDI camera technology Improving both imaging speed and clarity when imaging
moving objects
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Left: Using TDI, the object is scanned and captured during the entire length of its journey in contrast to the single line scan process where scan and capture occurs at the end and so resulting at a single exposure at that point. |
Major benefits of TDI technology | ![]() |
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More speed | With more effective integration time, the speed of the target object or inspection web can be increased allowing greater throughput | |
Less expense | High-frequency AC or even LED lighting can be used rather than, high-powered, high-cost, high-temperature halogen lighting with DC power. This can profoundly lower system build and maintenance costs. TDI operation effectively averages out fluctuations in light intensity to represent a DC light source. This factor alone can justify the increased cost of a TDI sensor versus the cost of using DC regulated light source and a line scan image sensor. | |
Immune to reflections |
TDI capture is not affected by direct sunlight reflections or reflections from lasers and is able to capture scene details in both highlight and shadow areas. | |
Other benefits • High quantum efficiency • High resolution • Wide imaging areas • Efficient thermal packaging • Efficient management of high-speed circuitry |
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Colour
TDI Technology |
Points to note if considering TDI technology
TDI requires more care in synchronization and alignment
but in general practice these requirements are not difficult to achieve.
A TDI sensor can withstand some misalignment (either translational or
rotational) without negative effect on image quality and a total misalignment
of one pixel or less across the length of a TDI sensor will not affect
image quality.
In most applications, a 96-stage TDI device can comfortably tolerate a
2-4% velocity mismatch between inspection web and imager. This is not
difficult to achieve using a web-mounted encoder to supply a sync signal
to the camera, even with webs that change speed and this approach is used
in thousands of successful applications.
Designed for light-starved applications, TDI typically lacks antiblooming
to subdue "glints", and as well, TDI sensors generally use photogates
- surface electrodes covering the entire pixel - and while this ensures
100% fill factor, it can attenuate incoming photons in the deep blue region.
One camera manufacturer, Teledyne DALSA has produced
an anti-blooming device to solve the first problem and has also developed
enhanced blue-response TDI sensors to compensate for the latter issue.
Where can TDI technology be used?
TDI CCDs are used in applications that require the ability to
operate in extreme lighting conditions, that require both
high speed and high sensitivity, for example:
• Inline monitoring, inspection and
guidance
• Sorting
• Earth observation satellite (for
weather observation, for example)
Click
here to learn more about TDI cameras available through Adept
Turnkey |
Need a price or more application information? Please email Adept Turnkey or call our offices
Adept Turnkey are "The Machine Vision and Imaging Specialists" and distributor of Machine Vision products in Australia and New Zealand. To find out more about any machine vision product, please call us at: Perth (08) 9242 5411 / Sydney (02) 9905 5551/ Melbourne (03) 9384 1775 or use our online contact us page.
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