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Describe a Pyrometer.

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Pyrometer is a instrument for measurement of temperature. Most of pyrometer measured relatively high temperature such as encountered in furnaces. Pyrometers are closely related to bolometer and thermistor and are used in thermometry. On the basis of how it works, it has mainly four types :
$1.$ Radiation pyrometer.
$2.$ Optical pyrometer.
$3.$ Resistance pyrometer
$4.$ Thermocouple pyrometer.

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