Characterization and reduction of the amplitude-to-phase conversion effects in telemetry

Joffray Guillory 1 Jorge García-Márquez 1 Christophe Alexandre 2 Daniel Truong 1 Jean-Pierre Wallerand 1
1 LCM - Laboratoire commun de métrologie LNE-CNAM
2 CEDRIC - LAETITIA - CEDRIC. Traitement du signal et architectures électroniques
CEDRIC - Centre d'études et de recherche en informatique et communications
Abstract : We are developing a telemeter based on the measurement of the phase accumulated by a RF sine wave during its propagation in air. This wave is carried by a laser beam thanks to an intensity modulation. The main limitation of this technique lies in amplitude-to-phase conversion occurring in the detection of this modulation. Therefore, we characterized in this paper this phenomenon for a given telemetric system and discuss on how to reduce its effects on the resolution and the accuracy of the distance measurement. Finally, a solution is implemented and tested outdoor, in real conditions of use.
Keywords : laser diode absolute distance meter photodetection amplitude modulation phase measurement amplitude-to-phase coupling optical telemetry
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Joffray Guillory, Jorge García-Márquez, Christophe Alexandre, Daniel Truong, Jean-Pierre Wallerand. Characterization and reduction of the amplitude-to-phase conversion effects in telemetry. Measurement Science and Technology, IOP Publishing, 2015, 26 (8), pp.084006. ⟨10.1088/0957-0233/26/8/084006⟩. ⟨hal-02448935⟩

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