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如何解释红外摄像机的图像

How to Interpret Images from Infrared Cameras?

A field campaign. A laboratory testbed. A volcano. Different applications of infrared cameras, but the very same modus operandi. Turn the camera on, point it toward the scene, and get images on the screen. It looks so simple! And the image is even calibrated in real temperature units. Great!

Real life conditions are unfortunately a bit more complex. Accurate interpretation of the infrared images may be achieved, but it requires a good knowledge of the measurement conditions along with some radiometry skills. The goal of the present note is to describe how simple scene models may be established, how their limitations are determined, and how can we use them to estimate physical parameters like the thermodynamic temperature of the objects we are looking at.

This technical note is divided into 2 parts. The first one deals with the most important effect a camera user is faced with: the object emissivity. In the second, we discuss the contribution of the semi-transparent atmosphere through which the object is observed.


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