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Proceedings Paper

Measurement of hot surfaces by pulsed time-of-flight laser radar techniques
Author(s): Kari E. Maatta; Juha Tapio Kostamovaara; Risto A. Myllylae
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Paper Abstract

This paper discusses the construction and capabilities of a time-of-flight laser rangefmder system for profiling measurements on hot surf,es (< 1400C), especially measurement of the thickness profile of the lining of a converter in iron works. Thebkgmtmdradiation is the main source ofthe noise in the receiverin this kind ofmeasurement. The inherentlylow signalto- noise ratio, typically 10 - 40,can be improved by the construction, adjustment ofthe parallel optics and optimization of the gain of the receiver avalanche photodiode. A stability of +1- 5 mm and a resolution of a few mm can be achieved in real measurement sitoations with a measurement time ofless than 1 second per poinL The non-linearity of the device at the near end ofthe measurementrange due to the paralleloptics and optical fibres is reduced to 5 mm by modifying the optics and using a mode mixer. The poor temperature stability, typically about -2 mm/'C, ofa device with different receiver channels for start and stop pulses can be improved by stabilizing the temperature ofthe electronics, orbeuer still, by using one electrical channel, in which case the temperature drift is almost zero in the temperature range -10C -+35C.

Paper Details

Date Published: 1 August 1990
PDF: 13 pages
Proc. SPIE 1265, Industrial Inspection II, (1 August 1990); doi: 10.1117/12.20246
Show Author Affiliations
Kari E. Maatta, 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. 1265:
Industrial Inspection II
Donald W. Braggins, Editor(s)

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