1
Hans Werner Pierenkemper, Sebastian Pastor: Method and an apparatus for determining distance. Sick, Townsend and Townsend and Crew, July 20, 2004: US06765393 (21 worldwide citation)

Techniques for determining the distance between a measuring apparatus and an object are provided. The measuring apparatus includes a transmitter, a receiver and a filter module having a defined phase frequency characteristic, in which a modulated signal, in particular a light signal, is transmitted ...


2
Takao Kobayashi: Method and apparatus for measuring distance by laser beam. Shibuya Kogyo, Flynn Thiel Boutell & Tanis, March 8, 1988: US04729653 (17 worldwide citation)

A method and an apparatus for determining distance by the use of laser beam is disclosed. An optical measuring system which derives a measuring beat wave in a known manner is combined with an optical reference system which derives a reference beat wave for allowing the distance to be determined to a ...


3
Hans Werner Pierenkemper, Sebastian Pastor: Method and an apparatus for determining distance. Sick, Townsend And Townsend And Crew, January 30, 2003: US20030020491-A1

The invention relates to a method of determining the distance between a measuring apparatus and an object, the measuring apparatus comprising a transmitter, a receiver and a filter module having a defined phase frequency characteristic, in which a modulated signal, in particular a light signal, is t ...