Test & Measurement


TDI sensors for high-speed imaging applications

28 November 2007 Test & Measurement

Hamamatsu's S10200 is a new TDI (time delay integration) sensor, featuring the latest high speed, high sensitivity, back thinned CCD image sensors. These sensors have an option for 1024, 2048 or 4096 pixel length by 128 pixel height, 90% peak quantum efficiency to visible light, with high UV and near IR sensitivity. The S10200 series offers very high-speed data readout of 30 MHz per pixel, which translates to 50 kHz or 100 kHz line rates, depending on the sensor.

Ordinarily, high-speed imaging systems suffer from a lack of available light and special illumination systems need to be constructed. Using the TDI image acquisition method however, these sensors can synchronise charge transfer with the moving object, thus giving 128 times the image integration time of a conventional line sensor, and when combined with the high sensitivity of the back thinned CCD chip, this results in an output two or three orders of magnitude greater than a regular line scan camera.

The features of this new CCD make it ideal for applications in low light level and high-speed industrial inspection, particularly where UV and NIR sensitivity are required; in particular the inspection of mass-produced consumer goods, such as flat panel and LCD displays, web inspection, electronic components and PC-board inspection (AOI), biomedical instrumentation such as flow cytometry, postal sorting, high-speed fluorescence imaging, semiconductor inspection and many other in-line industrial applications.



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