Name: FLIR T1020
Brand: FLIR
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Theory of thermography

38.4 Infrared semi-transparent materials

Consider now a non-metallic, semi-transparent body – let us say, in the form of a thick flat

plate of plastic material. When the plate is heated, radiation generated within its volume

must work its way toward the surfaces through the material in which it is partially ab-

sorbed. Moreover, when it arrives at the surface, some of it is reflected back into the inte-

rior. The back-reflected radiation is again partially absorbed, but some of it arrives at the

other surface, through which most of it escapes; part of it is reflected back again.

Although the progressive reflections become weaker and weaker they must all be added

up when the total emittance of the plate is sought. When the resulting geometrical series

is summed, the effective emissivity of a semi-transparent plate is obtained as:

When the plate becomes opaque this formula is reduced to the single formula:

This last relation is a particularly convenient one, because it is often easier to measure

reflectance than to measure emissivity directly.

#T559954; r. AP/42311/42335; en-US

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