SEQUENCE-CODED LASER RANGE-FINDERS
Most laser range-finders are based on the transmission of short, isolated and intense pulses, and measurement of the time-of-flight of reflected echoes. The instantaneous peak power levels of transmitted pulses in such devices must be rather high. Our group and collaborators have proposed and demonstrated an alternative scheme for a laser range-finder, which is based on the transmission of extended, coded sequences. The peak power levels that are necessary are lower by orders of magnitude. Range is recovered through the proper post-processing of extended detected echoes. The principle was successfully implemented based on simple semiconductor laser diode sources and semiconductor optical amplifiers. A measurement range of 1100 m was achieved, with a ranging resolution of 15 cm.
• N. Arbel, L. Hirschbrand, S. Weiss, N. Levanon and A. Zadok, "Continuously Operating Laser Range Finder Based on Incoherent Pulse Compression: Noise Analysis and Experiment," IEEE Photonics 8, 6801211, (2016).
• D. Kravitz, D. Grodensky, N. Levanon, and A. Zadok, “High-Resolution Low-Sidelobe Laser Ranging Based on Incoherent Pulse Compression," IEEE Photon. Technol. Lett. 24, 2119-2121 (2012).