Dalhoff, ErnstFischer, EdgarKreuz, SilkeTiziani, Hans J.2011-03-212016-03-312011-03-212016-03-311993366709585http://nbn-resolving.de/urn:nbn:de:bsz:93-opus-61797http://elib.uni-stuttgart.de/handle/11682/4406http://dx.doi.org/10.18419/opus-4389We present a double-heterodyne interferometer for absolute distance measurements at rough surfaces up to 100 metres. The two wavelengths are generated by frequency shifting the light of a monomode laser diode using a 500 MHz acoustooptic modulator. The synthetic wavelength obtained is λ = 60 cm. In order to yield unambiguity up to 100 meter distance two measurements have to be taken using slightly different frequency shifts of 500 resp. 501.5 MHz. Measurements showing a resolution of 0.1 mm are presented.eninfo:eu-repo/semantics/openAccessElektrooptische Entfernungsmessung , Heterodyninterferometrie620conferenceObject2012-06-14