Spectral Response
The wavelength region in which the IR Thermometer is sensitive.
Spot
The diameter of the area on the target where the temperature determination is made. The spot is defined by the circular aperture at the target that allows typically 90% of the IR energy to be collected by the instrument, as compared with the 100% spot diameter which is defined by the IR energy collected from a very large target. The actual size and distance to the target for the 100% spot diameter is specified in the calibration procedure for each instrument.
Stare
A saturation effect caused by aiming a sensor at a hot target for an extended period of time and then quickly aiming at a target at a lower temperature. The increase in time (beyond the normal system response) for the sensor to return to within 5 % of the lower temperature is defined as the stare time.
Storage Temperature Range
Ambient temperature range that the thermometer can safely withstand in a
Target
The object upon which the temperature determination is being made.
Temperature
A degree of hotness or coldness of an object measurable by a specific scale; where heat is defined as thermal energy in transit, and flows from objects of higher temperature to objects of lower temperature.
Temperature Coefficient (or Ambient Derating)
An indication of the instruments ability to maintain accuracy when the ambient conditions are subject to a slow change or drift. The temperature coefficient is usually expressed as the percent change in accuracy per degree change in ambient temperature. For a rapid change in ambient conditions refer to Thermal Shock.
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