In sensors with an extra wide measuring field (also called line sensors), the light of the integrated illumination is reflected by an opposite reflection foil and is received by the diode array. The length of the diode array together with the optics determines the measuring field size. If an object shadows a part of the light, no light will fall on the corresponding part of the diode array. The integrated micro-controller analyzes the dark areas and the dark-bright transitions and calculates the corresponding analog value depending on the measuring mode. Line sensors have an opening radiation field which enables larger measuring distance and a wider measuring field. The specified measuring field size is reached at the nominal distance (measuring distance from the object). Increasing or decreasing in proportion to the distance, the object appears to be larger or smaller.