| 主权项 |
1. Method for the contactless detection of laminated, flat objects, particularly sheet-like recording media, relative to separated single, multiple or missing sheets of recording media, the recording media intersecting a radiation path of at least one transmitter and an associated receiver of an ultrasonic sensor device and in which radiation transmitted by the recording media or radiation received in a case of a missing sheet by the receiver is received as a measuring signal, which is supplied to a following evaluation for generating a corresponding detection signal, at least the transmitting signal on the transmitter side is generated in a galvanically separated manner from the receiver by eliminating any voltage signal paths and any current signal paths between the transmitter and the receiver, and the transmitter and receiver are vibrationally decoupled from one another;
wherein at least one correction characteristic is supplied to the evaluation, and wherein the correction characteristic transforms a characteristic of an input voltage of the measuring signal from the receiver as a function of a gram weight or weight per unit area of the recording media to a target characteristic which, for sheet-like recording media, there is an almost linear characteristic or a characteristic approximated to an ideal characteristic of a separated single sheet as a target characteristic between an output voltage at an output of the evaluation and the gram weight or weight per unit area for generating the corresponding detection signal. |
