Scientific Results

Multiwavelength Frequency Modulated CW Ladar: The Effect of Refractive Index

Year: 2020

Authors: Barbieri M., Pallotti DK., Siciliani de Cumis M., Santamaria Amato l.

Autors Affiliation: ASI, Italian Space Agcy, Space Geodesy Ctr G Colombo, I-75100 Matera, Italy; CNR INO, Ist Nazl Ott, Largo E Fermi 6, I-50125 Florence, Italy; CNR INO, Ist Nazl Ott, Via Campi Flegrei 34, I-80078 Pozzuoli, Italy

Abstract: Frequency modulated continuous wave (FMCW) laser detection and ranging is a technique for absolute distance measurements with high performances in terms of resolution, non-ambiguity range, accuracy and fast detection. It is based on a simple experimental setup, thus resulting in cost restraint with potential wide spread, not only limited to research institutions. The technique has been widely studied and improved both in terms of experimental setup by absolute reference or active stabilization and in terms of data analysis. Very recently a multi-wavelength approach has been exploited, demonstrating high precision and non ambiguity range. The variability of refractive index along the path was not taken into account with consequent degradation of range accuracy. In this work we developed a simple model able to take into account refractive index effect in multi-wavelength FMCW measurement. We performed a numerical simulation in different atmospheric conditions of temperature, pressure, humidity and CO2 concentration showing a net improvement of range accuracy when refractive index modeling is used.

Journal/Review: PHOTONICS

Volume: 7 (4)      Pages from: 90-1  to: 90-10

KeyWords: laser ranging; length metrology; frequency modulated cw
DOI: 10.3390/photonics7040090

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