Dr. Ivan Dolezal Profile

Dr. Ivan Dolezal

at Technical Univ of Liberec

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Proceedings Article | 17 March 2008 Paper

Emissivity independent low-temperature pyrometry

Ivan Dolezal, Lubos Hes

Proceedings Volume 6939, 693904 (2008) https://doi.org/10.1117/12.778991

KEYWORDS: Sensors, Temperature metrology, Pyrometry, Signal detection, Mirrors, Target detection, Infrared detectors, Data acquisition, Transmittance, Resistance

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Uncertainty of a target emissivity and environment transmittance and possible reflected radiation are major origins of pyrometer inaccuracy. Measurement without knowledge of emissivity requires gaining at least two independent signals relating to the target. The patented method takes advantage of two same infrared detectors but maintained on different temperatures. A simplified approach implies a radiation enclosure that consists of 2 bodies (target vs. detector), thus a formula for temperature obtained from a set of 2 equations appears simple. Infrared detectors that can work at considerable high temperature are unavailable so temperature range of this method is limited. In an experimental facility, the first thermopile detector is heated by a transistor, the second one is cooled by a Peltier cooler. The swivel radiant heater of cube shape exhibits single of 4 surfaces with different emissivity towards the detectors. The radiation is both concentrated and switched to single detector by a pivoted toric mirror. Close mutual arrangement without optics is optional. All sensors and actuators are connected to a Data Acquisition Switch Unit. The experiment including control loops is fully managed by a PC program. Various side effects of realization like probably an influence of housing radiation at ambient temperature and reflection cause that simple formula is not adequate so that multivariable regression had to be involved. Experimental results are shown in graphs.

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