Measurement of hot surfaces by pulsed time-of-flight laser radar techniques

Kari E. Maatta; Juha Tapio Kostamovaara; Risto A. Myllylae

doi:10.1117/12.20246

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1 August 1990 Measurement of hot surfaces by pulsed time-of-flight laser radar techniques

Kari E. Maatta, Juha Tapio Kostamovaara, Risto A. Myllylae

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Proceedings Volume 1265, Industrial Inspection II; (1990) https://doi.org/10.1117/12.20246
Event: The International Congress on Optical Science and Engineering, 1990, The Hague, Netherlands

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.

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Kari E. Maatta, Juha Tapio Kostamovaara, and Risto A. Myllylae "Measurement of hot surfaces by pulsed time-of-flight laser radar techniques", Proc. SPIE 1265, Industrial Inspection II, (1 August 1990); https://doi.org/10.1117/12.20246

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