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This article in AJ

  1. Vol. 61 No. 2, p. 324-325
    Received: May 11, 1968

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Ambient Temperature Effects in Infrared Thermometry1

  1. Ray D. Jackson and
  2. Sherwood B. Idso2



The output signals of two different infrared thermometers deviated drastically when internal console temperatures rose above 48 and 58 C. Internal temperatures greater than 48 C were observed in both instruments on all clear days investigated, rendering one instrument useless during the warmer parts of these days. In addition, one of the instruments also had a temperature-dependent calibration curve, which introduced severe uncertainties into its accuracy.

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