The Practicalities of a Spatial Coherence Filter in free-space LIDAR Environments

Paul Hawthorne*, Mark W. McDonald, Ian Park, Duncan P. Hand

*Corresponding author for this work

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

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A scanning LIDAR system that uses a single pixel detector can be highly attractive, with simple data processing coupled with low cost and complexity. However, the impact of ambient light noise is much greater than with a multiple pixel system. A potential means of overcoming this is to filter for transverse spatial coherence. Such filters have been discussed and evaluated in the literature, typically based on an axicon or a spiral phase plate that creates a ring with coherent light. Incoherent light, in contrast, smears the light out diffusely, allowing for spatial separation and thus, filtering. The focus of the existing literature tends to be in optical communication or underwater ranging, whereas a free-space LIDAR environment has distinct issues that inhibit the practicality of the filter if a direct replication is performed. This work thus focusses on exploring the practical implementation of these filters in a free-space LIDAR environment.

Original languageEnglish
Title of host publicationElectro-Optical and Infrared Systems
Subtitle of host publicationTechnology and Applications XX
EditorsDuncan L. Hickman, Helge Bursing, Gary W. Kamerman, Ove Steinvall
ISBN (Electronic)9781510667037
Publication statusPublished - 23 Oct 2023
Event SPIE Security + Defence 2023 - Amsterdam, Netherlands
Duration: 3 Sept 20235 Sept 2023

Publication series

NameProceedings of SPIE
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


Conference SPIE Security + Defence 2023


  • acronyms
  • image area
  • references
  • Times Roman

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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