Contactless remote measurement device with laser emitter, uses number of fixed gain amplifiers with signal selection module for further processing of amplifier signal

摘要

A device for contactless remote measurement has a radiation source (4) for transmitting intensity-modulated radiation, and a radiation receiving unit (8) for converting the radiative fraction reflected back from the object surface (6) into an electric signal. An amplifier comprises of a number of fixed gain amplifiers and a signal selection module is available for further processing of the output signal of the amplifier stage to keep the output signal level within the tolerance range to which the standard level corresponds.