A corded sensor has three basic elements. First is a scintillator. When x-rays impact the scintillator it fluoresces, creating a very precise pattern of light.
Many, but not all, sensors have an optical fibre. It transmits the light from the scintillator screen to the chip and protects the chip from x-rays.
A solid state computer chip receives the light and converts it into a digital electronic signal. This is the same basic chip technology that a digital camera uses to convert light into a digital photo. There are two different types of chip in use; they are CCD (Charged Couple Device) and CMOS (Complimentary Metal Oxide Semiconductor).
These two chip types function differently but both produce good images of diagnostic quality.