Difference between radiation pyrometer and optical pyrometer

There is difference between radiation pyrometer and optical pyrometer is given below.

Radiation pyrometer Optical pyrometer
Temperature is direct measured with the help of thermocouple. Temperature is measured by comparing the brightness of hot body radiation at specific colour.
Emissivity of target may affect measurement. Dust, smoke and thermal background radiation affect.
Chance of error is negligible. Causing human error.
The radiation pyrometer has moderate cost. The optical pyrometer has high cost.
The output is directly given by thermocouple in terms of m volt. The output is observed by human eye.
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