title: Synthetic-wavelength interferometry improved with frequency calibration and unambiguity range extension.
abstract: We improve the accuracy of distance measurements with synthetic-wavelength interferometry by referencing the spectral spacing of the free-running light sources to a high-precision radio-frequency oscillator. In addition, we increase the unambiguity range with a time-of-flight technique. Distances to scattering technical surfaces can be measured with micrometer accuracy and an unambiguity range of 1.17 m. The measurement rate amounts to 300 Hz.
authors.forename: Claudius
authors.initials: C
authors.lastname: Weimann
authors.forename: Markus
authors.initials: M
authors.lastname: Fratz
authors.forename: Harald
authors.initials: H
authors.lastname: Wölfelschneider
authors.forename: Wolfgang
authors.initials: W
authors.lastname: Freude
authors.forename: Heinrich
authors.initials: H
authors.lastname: Höfler
authors.forename: Christian
authors.initials: C
authors.lastname: Koos