Line sensors or photodiode arrays (PDA) are optoelectronic sensors, CCD or CMOS sensors
, in which the individual light-sensitive semiconductor pixels are arranged in rows. Such a line sensor consists of a single line of adjacent CCD pixels. The pixel size determines the resolution. The number of pixels depends on the length of the scan line and the pixel size and can range from a few dots per inch
(dpi) to several thousand dots per inch, depending on the application.
, in which they scan the originals line by line. During the scanning process, the sensor area is illuminated with a light strip. Thereflected light
isconverted into a digital signal
inan A/D converter
. Other areas of application include control and monitoring functions in production and merchandise management, determining the position of objects or counting objects.