A pyrometer or radiation thermometer is a non-contact instrument that detects an objects surface temperature by measuring the temperature of the electromagnetic radiation (infra rd or visible) emitted from the object.
- RADIATION PYROMETERS
Radiation pyrometers are used for measuring temperature up to 10000 oF. They are also used for measuring higher temperature of moving objects or when the use of other sensitive device is in practical.
In radiation pyrometer the radiant heat or energy from the hot substance is translated into emf by the thermocouple and indicated in degrees of temperature.
Advantages of pyrometer :
No need of contact
Fast response speed
Disadvantages of pyrometer :
Emissitive error are introduced
Error due to the obsortion of the radiation by the carbon dioxide , water or other apparently transparent gases