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Proceedings Paper

Lidar measurement as support to the ocular hazard distance calculation using atmospheric attenuation
Author(s): K. Ove S. Gustafsson; Rolf Persson; Frank Gustafsson; Folke Berglund; Jonas Malmquist
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Paper Abstract

The reduction of the laser hazard distance range using atmospheric attenuation has been tested with series of lidar measurements accomplished at the Vidsel Test Range, Vidsel, Sweden. The objective was to find situations with low level of aerosol backscatter during this campaign, with the implications of low extinction coefficient, since the lowest atmospheric attenuation gives the highest ocular hazards. The work included building a ground based backscatter lidar, performing a series of measurements and analyzing the results. The measurements were performed during the period June to November, 2014. The results of lidar measurements showed at several occasions’ very low atmospheric attenuation as a function of height to an altitude of at least 10 km. The lowest limit of aerosol backscatter coefficient possible to measure with this instrument is less than 0.3•10-7 m-1 sr-1. Assuming an aerosol lidar ratio between 30 – 100 sr this leads to an aerosol extinction coefficient of about 0.9 - 3•10-6 m-1. Using a designator laser as an example with wavelength 1064 nm, power 0.180 W, pulse length 15 ns, PRF 11.5 Hz, exposure time of 10 sec and beam divergence of 0.08 mrad, it will have a NOHD of 48 km. With the measured aerosol attenuation and by assuming a molecule extinction coefficient to be 5•10-6 m-1 (calculated using MODTRAN (Ontar Corp.) assuming no aerosol) the laser hazard distance will be reduced with 51 - 58 %, depending on the lidar ratio assumption. The conclusion from the work is; reducing of the laser hazard distance using atmospheric attenuation within the NOHD calculations is possible but should be combined with measurements of the attenuation.

Paper Details

Date Published: 16 October 2015
PDF: 7 pages
Proc. SPIE 9649, Electro-Optical Remote Sensing, Photonic Technologies, and Applications IX, 964906 (16 October 2015); doi: 10.1117/12.2194259
Show Author Affiliations
K. Ove S. Gustafsson, FOI-Swedish Defence Research Agency (Sweden)
Rolf Persson, FOI-Swedish Defence Research Agency (Sweden)
Frank Gustafsson, FOI-Swedish Defence Research Agency (Sweden)
Folke Berglund, FOI-Swedish Defence Research Agency (Sweden)
Jonas Malmquist, Swedish Defence Materiel Administration (Sweden)

Published in SPIE Proceedings Vol. 9649:
Electro-Optical Remote Sensing, Photonic Technologies, and Applications IX
Gary Kamerman; Ove Steinvall; Keith L. Lewis; John D. Gonglewski, Editor(s)

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