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I found on a site that it is important to know the temperature of the infrared sensor while calibrating the infra red sensor, but I could not find the real reason behind this. Anyone knows it?

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    \$\begingroup\$ because it's a thermal sensor, and the temperature of the sensor itself is crucial to what it outputs? \$\endgroup\$ Commented May 4, 2020 at 14:11
  • \$\begingroup\$ This seems really logic, would be nice if I can find this back in an equation for example \$\endgroup\$
    – J. Joly
    Commented May 4, 2020 at 14:54

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Your question is worded poorly. I think what you mean is why is it important to also know the temperature of a thermopile itself (as opposed to just the temperature of the target).

This is because thermopiles only measure the temperature DIFFERENCE between themselves and the target. It does not measure absolute temperature. If you want to measure absolute temperature of a target then you have to have another way to measure the thermopile's own temperature and then add that to the temperature difference being measured by the thermopile.

This seems really logic, would be nice if I can find this back in an equation for example

Now that you know what I just said, I don't see what you expect an equation to do for you here unless the equation you are looking for is just:

\$T_{target} = T_{Thermopile} + \Delta T_{measured} \$

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