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Everyday Heat Transfer Problems: Sensitivities to Governing Variables
M. Kemal Atesmen
M. Kemal Atesmen
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ASME Press
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In an active infrared sensor, the surface temperature is held constant during the measurement process by providing controlled energy to the sensor's surface. The sensor surface receives radiation heat transfer energy from the surface of the object being measured. The sensor also loses thermal energy to its environment. The temperature at the sensor's surface can be analyzed by using unsteady-state and one-dimensional heat transfer rate equations in rectangular coordinates.

Unsteady-state heat transfer in an active infrared sensor is detailed in the Reference by J. Fraden [3]. The energy balance of a sensor element can be written as follows:
Change in internal energy of the sensor with respect to time=Control energy supplied to regulate the surface temperature of the sensorEnergy lost from the sensor to the environment by conduction and by convection heat transfer+Net radiation heat transferred from the object being measured to the sensor
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