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Photonics Dictionary

time delay and integration (TDI)

A method of scanning in which a frame transfer device produces a continuous video image of a moving object by means of a stack of linear arrays aligned with and synchronized to the movement of the object to be imaged in such a way that, as the image moves from one line to the next, the stored charge moves along with it, providing higher resolution at lower light levels than is possible with a line-scan camera.
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