Scanning of low signature targets using time-correlated single-photon counting

G. S. Buller, R. J. Collins, N. J. Krichel, A. M. Wallace, A. McCarthy

Research output: Chapter in Book/Report/Conference proceedingConference contribution

4 Citations (Scopus)

Abstract

We describe a scanning time-of-flight system which uses the time-correlated single photon-counting technique to produce three-dimensional depth images of scenes using low average laser power levels (ie <1mW). The technique is fundamentally flexible: the trade-off between the integrated number of counts (or acquisition time) against depth resolution permits use in a diverse range of applications. The inherent time gating of the technique, used in conjunction with spatial and spectral filtering, permits operation under high ambient light conditions.Our optical system uses a galvanometer mirror pair to scan the laser excitation over the scene and to direct the collected scattered photon return to an individual silicon single-photon avalanche diode detector. The system uses a picosecond pulsed diode laser at a wavelength of 850nm at MHz repetition rates. The source is directed to the target and the scattered return is collected using a 200mm focal length camera lens. The optical system is housed in a compact customdesigned slotted baseplate optomechanical platform. Currently, the system is capable of a spatial resolution and a depth resolution of better than 10cm at 1km range. We present a series of measurements on a range of non-cooperative target objects. © 2009 SPIE.

Original languageEnglish
Title of host publicationAdvanced Photon Counting Techniques III
Volume7320
DOIs
Publication statusPublished - 2009
EventSignal Processing, Sensor Fusion, and Target Recognition XVIII - Orlando, FL, United States
Duration: 13 Apr 200915 Apr 2009

Conference

ConferenceSignal Processing, Sensor Fusion, and Target Recognition XVIII
CountryUnited States
CityOrlando, FL
Period13/04/0915/04/09

Keywords

  • Depth imaging
  • Photon-counting
  • Ranging
  • Time-of-flight

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