https://doi.org/10.1051/epjconf/202023806016
Application of the Vernier method for absolute distance metrology with CW TOF phase shift technique
1 Instituto de Astrofísica e Ciências do Espaço, Universidade de Lisboa, Campo Grande, PT1749-016 Lisboa, Portugal
2 Departamento de Física, Faculdade de Ciências, Universidade de Lisboa, Edifício C8, Campo Grande, PT1749-016 Lisbon, Portugal
* e-mail: fc48080@alunos.fc.ul.pt
** e-mail: maabreu@fc.ul.pt
*** e-mail: dmvalves@fc.ul.pt
Published online: 20 August 2020
A phase shift time of flight technique determines a position by comparing the phase angle of a continuously modulated signal in the source and its reflection on a target. However, due to its cyclical properties, the position information is contained within an ambiguity interval. For an absolute measurement, this interval is repeated N times plus a residual part given by the phase shift. In this work we propose an application of the Vernier method to determine N and a setup for mid-range applications (10-20) m with a 3 GHz amplitude modulated source to allow accuracies ≤ 100 μm.
© The Authors, published by EDP Sciences, 2020
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
