title: Double-wavelength superheterodyne interferometer for absolute ranging with submillimeter resolution: results obtained with a demonstration model by use of rough and reflective targets.
abstract: The potential of double-wavelength interferometry is well known, especially regarding the capability of performing absolute distance measurements of rough targets with high resolutions. We describe the experimental results obtained with a demonstration model of a double-wavelength interferometer with superheterodyne detection. Our system, implemented with two four-quadrant detectors to improve the detection probability, has demonstrated the ability to reach resolutions of 0.2 mm at 5-m distances on rough targets in 50-ms integration time.
authors.forename: G
authors.initials: G
authors.lastname: Margheri
authors.forename: C
authors.initials: C
authors.lastname: Giunti
authors.forename: S
authors.initials: S
authors.lastname: Zatti
authors.forename: S
authors.initials: S
authors.lastname: Manhart
authors.forename: R
authors.initials: R
authors.lastname: Maurer