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Proceedings Paper

Use of optical fibers in the pulsed time-of-flight laser rangefinding technique
Author(s): Seppo M. Nissilae; Juha Tapio Kostamovaara; Risto A. Myllylae
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Paper Abstract

The problems associated with the fibres used in pulsed time-of-flight rangefinders were studied, and particularly errors due to the transit time disturbances of step and graded index fibres as a function of fibre length, input numerical aperture and temperature. The cladding modes and leaky modes ofa fibre can affect the transit time oflight pulses under suitable conditions, so that fibres become sensitive to environmental effects. The effect of temperature is smaller and more linear for acryl-coated fibres than for nylon-coated ones. The main reason for the non-linear effect of temperature on a nylon fibre is the non-linear Young's modulus of nylon as a function of temperature. The increasing transit time of hard clad silica (HCS) fibres at lower temperatures (below +20°C), contrary to glass fibres, can be explained by the different thermal coefficient of the core and cladding, leading to increased non-homogenities on the core-cladding interface.

Paper Details

Date Published: 1 August 1990
PDF: 8 pages
Proc. SPIE 1267, Fiber Optic Sensors IV, (1 August 1990); doi: 10.1117/12.20291
Show Author Affiliations
Seppo M. Nissilae, Univ. of Oulu (Finland)
Juha Tapio Kostamovaara, Univ. of Oulu (Finland)
Risto A. Myllylae, Technical Research Ctr. of Finland (Finland)


Published in SPIE Proceedings Vol. 1267:
Fiber Optic Sensors IV
Ralf Th. Kersten, Editor(s)

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