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Proceedings Paper

On The Use Of An Optomechanical Sensing Head In Time-Of-Flight Laser Rangefinding
Author(s): M. Koskinen; R. Ahola; J. Kostamovaara; R. Myllyla
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Paper Abstract

The time-of-flight (TOF) laser rangefinding technique has recently found many applications for industrial measurement purposes. The electronics of a rangefinder can be separated from the sensing head using optical fibres. In spite of many advantages such as non-sensitivity to demanding environments, optical fibres also introduce some potential measurement errors. To analyze the effects on performance of using long optical fibres in pulsed TOF rangefinding, an experimental laser rangefinder intended especially for the measurement of to-and-fro motion was developed. The rangefinder has a separate optomechanical sensing head, which is connected to the electronic unit by a shielded cable containing the transmitter and receiver fibres. The transmitter has a pulse repetition rate of 1.3 MHz and the receiver includes a high speed transimpedance preamplifier and automatic gain control electronics. An analogue time-to-amplitude converter is employed to obtain high speed, high resolution measurement. The performance of the rangefinder with different fibre lengths is analysed here, concen-trating mainly on the resolution and differential non-linearity, the integral non-linearity being of less significance due to the AC nature of the measurement.

Paper Details

Date Published: 16 January 1988
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Proc. SPIE 0952, Laser Technologies in Industry, (16 January 1988); doi: 10.1117/12.968863
Show Author Affiliations
M. Koskinen, Noptel Ky (Finland)
R. Ahola, Noptel Ky (Finland)
J. Kostamovaara, University of Oulu (Finland)
R. Myllyla, Technical Research Centre of Finland (Finland)


Published in SPIE Proceedings Vol. 0952:
Laser Technologies in Industry

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