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Proceedings Paper

A system for one-way ranging and positioning using differential TCSPC
Author(s): Matthias Fuhrland; Lukas Eng; Michael Wahl
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Paper Abstract

The article describes a principle of 3D-positioning by pseudo-ranges using ultrashort laser pulses. It can be used as an local optical positioning system (LOPS). Laser pulses are sent out highly divergent to four detectors with known positions. The goal is to determine the 3D position of the laser pulser. A TSCPC system is used to measure differential time of flight between the four detectors. The main problem of differential TCSPC is the small probability to detect each two photons of the same pulse at different positions. It therefore takes the highest possible laser power to measure pseudo-ranges this way over a distance of 30 m and more. A second requirement for such a system is mobility. This is why we tried to realize the laser subystem with a diode laser and subsequent beam shaping using axicon optics. Investigations with different ps-laser pulsers and different detector types are shown. An important investigation concerning the ranging accuracy was the comparison of two TCSPC systems, one with TAC and ADC and the other with TDC. Furthermore the development of an elastic lens for variable defocussing of the laser is shown.

Paper Details

Date Published: 15 October 2007
PDF: 9 pages
Proc. SPIE 6771, Advanced Photon Counting Techniques II, 677116 (15 October 2007); doi: 10.1117/12.734034
Show Author Affiliations
Matthias Fuhrland, Dresden Univ. of Technology (Germany)
Lukas Eng, Dresden Univ. of Technology (Germany)
Michael Wahl, Picoquant GmbH (Germany)

Published in SPIE Proceedings Vol. 6771:
Advanced Photon Counting Techniques II
Wolfgang Becker, Editor(s)

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