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1 August 1990Use of optical fibers in the pulsed time-of-flight laser rangefinding technique
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.
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Seppo M. Nissilae, Juha Tapio Kostamovaara, Risto A. Myllylae, "Use of optical fibers in the pulsed time-of-flight laser rangefinding technique," Proc. SPIE 1267, Fiber Optic Sensors IV, (1 August 1990); https://doi.org/10.1117/12.20291