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Synthetic-wavelength interferometry improved with frequency calibration and unambiguity range extension

 
: Weimann, Claudius; Fratz, Markus; Wölfelschneider, Harald; Freude, Wolfgang; Höfler, Heinrich; Koos, Christian

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Applied optics 54 (2015), No.20, pp.6334-6343
ISSN: 0003-6935
ISSN: 1539-4522
ISSN: 1559-128X
English
Journal Article
Fraunhofer IPM ()
interferometry; remote sensing; laser range finder

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.

: http://publica.fraunhofer.de/documents/N-358532.html