Infrared Imaging Types

Question 1

List all IR imaging types.

Answer 1

IR, IR Reflectography (IRR), IR Transmitted (IRT), IR Fluorescence (IRF), IR Reflectography Fluorescence (IRRF), IR False Color (IRFC)

Question 2

What is IRR used for?

Answer 2

Detecting underpainting and material transparency.

Question 3

Why can’t Prussian blue detect indigo underneath?

Answer 3

Because Prussian blue on the surface absorbs IR, masking lower layers.

Question 4

Camera used in IRR?

Answer 4

InGaAs (Indium Gallium Arsenide), 1100–1700 nm sensor.

Question 5

IRT usage?

Answer 5

For thin transparent items (canvas, documents); light source placed behind or under.

Question 6

IRF usage?

Answer 6

To identify Egyptian blue or cadmium red using visible light and IR filter.