Plant Operation Practice Test

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Which device is used to measure radiation emitted from an object?

Infrared thermometer
Thermocouple
Barometer
Pressure gauge

The correct answer is: Infrared thermometer

The infrared thermometer is specifically designed to measure the temperature of an object by detecting the infrared radiation it emits. This device operates based on the principle that all objects emit infrared radiation as a function of their temperature, allowing it to provide a non-contact measurement. This capability is especially useful when dealing with hot surfaces or hazardous materials, where direct contact measuring devices might not be safe or practical. In contrast, a thermocouple measures temperature through the voltage generated at the junction of two different metals and does require direct contact with the object, making it less suitable for measuring radiation. A barometer measures atmospheric pressure and does not relate to radiation measurement at all. Similarly, a pressure gauge measures the pressure of gases or liquids, which has no connection to radiation. Thus, the infrared thermometer stands out as the appropriate choice for measuring radiation emitted from an object.