January 10 2020
Two-Color or Ratio Pyrometers measure temperatures from the ratio of radiation signals of two adjacent wavelengths as opposed to measuring the absolute intensity within one wavelength, i.e. 1-color pyrometers. The advantages and benefi ts of using 2-color sensors are the following:
- Automatic compensation for viewing though dirty windows, dust and partial smoke between sensor
and target. - Compensation for changes in target emissivity i.e. gray bodies—targets with the same emissivity on
both wavelengths. - Measures smaller target than sensor’s fi eld of view (FOV) i.e. measures weighted peak temperature
within FOV. - Unaffected by moving targets within FOV.
