Apparatus and method for the purpose of non-touching object recognition, with a high level of interference immunity

摘要

The invention relates to an apparatus and a device for the purpose of non-touching object recognition with a high level of interference immunity, in that the evaluated echo pulses do not trigger an output directly but are processed in a counter and are compared with the clock rate, to the extent that a multiplicity of echoes must be evaluated successively in order to produce an alarm. To this extent, the invention increases the interference immunity to random pulses.