optris CTratio 1M Series, Руководство оператора

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10.4 Characteristic Slope Values
The slope is the quotient of the emissivity of both of the overlapping wavelength bands. The factory default
value for the slope is 1,000. The following slopes are typical reference values. The real slope can vary
depending on the metal alloy and surface finish.
Cobalt, Iron, Nickel, Stainless steel, Steel
► oxidized surfaces
Slope: 1,000
Cobalt, Iron (solid, molten), Molybdenum,
Nickel, Platinum, Rhodium, Stainless steel,
Steel, Tantalum, Tungsten, Wolfram
► non-oxidized surfaces
Slope: 1,060
10.5 Determination of unknown Slope values
Basically you can use the same methods to determine an unknown slope as described under
►10.2 Determination of unknown Emissivity
. As the CTratio is dedicated for high temperature
applications, only the first method may be practically applicable (use of a t/c or other contact probe).
10.6 Attenuation
The CTratio is able to measure the temperature of targets smaller than the field of view (FOV). If the target
size is smaller than the FOV (and thus attenuating the signal) this may cause a small inaccuracy of the
reading. The inaccuracy is dependent on the object temperature and value of attenuation. The higher the
object temperature and attenuation the higher the inaccuracy of the sensor.