I n this article, we present a wide angle, frequency scanning interferometer (FSI) system capable of measuring the absolute distance to multiple targets simultaneously.

A spatial light modulator has been integrated into the FSI sensor head, projecting multiple beams towards targets. Absolute distance measurements of up to 6.8-m range have been achieved with high signal-to-noise values. Design of the optical system has allowed targets with angular range of ± 55˚ off-axis to be measured. So far up to 10 targets have been measured simultaneously at distances ranging from 1.5 m to 6.8 m, and at off-axis angles of ±30˚. For increased practicality and usability a stereo vision system with target detection software has been developed and integrated allowing tracking of multiple targets over the measurement volume.

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