Digital scanning measurement unit, e.g. scanning tunnel microscope; has differential element, analogue to digital converter and computer to form absolute image signal values from difference signals

摘要

The unit has a detector (12) that scans the surface (10) in rows. A differential element (14) is connected between the detector output and an analogue to digital converter (16), which is connected to a computer device (18). The computer device reconstructs absolute output values from the digital difference signals to generate the image signal. An output device (20) for the image data is connected to the computer device output.