Patent ID: 7982860

Claim:
A distance measuring device equipped with a transmitter unit ( 20 ) for producing a transmission signal ( 42 ) that has at least one measurement frequency (f 1 , f 2 ) desired for a detection of a piece of distance information, wherein the transmitter unit ( 20 ) includes a means ( 60 ) for producing an evaluation signal ( 62 ), which has an evaluation frequency (f A ) desired for an evaluation of the distance information, wherein the means ( 60 ) for producing the evaluation signal is embodied in the form of a mixing unit for mixing production signals ( 44 , 46 ) used to produce the transmission signal ( 42 ), and a phase coupling unit ( 72 ) is provided to couple the evaluation signal ( 62 ) to a reference signal ( 74 ) in a locked in-phase fashion through a regulation of the production signals ( 44 , 46 ).