The chapter most infrared material omits is the first one here: conduction, convection and radiation decide where a fault’s heat reaches a surface, and whether it reaches one at all. That is why a closed panel survey finds so little, and the book works the arithmetic that shows it.
Emissivity gets a chapter of its own, because it is the largest single source of error in the discipline and the one setting a thermographer chooses by hand.
Study material written by Sensemore. It is not accredited training, it is not from any certification body’s question bank, and it confers no certification.