20 Infrared recording

20.1 Introduction

Photography is normally confined to the visible region of the EM spectrum, but extension using nonvisible radiations is possible. Various imaging techniques allow recording of the infrared (IR) regions. The optimum methods is usually determined by the emission, absorption, transmission and reflection of IR by a subject as part of its spectral signature. Broadly speaking, there are two groups of techniques, those concerned with photographic IR sensitized materials, and thermal infrared imaging using other forms of sensor (see Chapter 21).

Figure 20.1 Infrared recording and the electromagnetic spectrum The diagram shows the various IR zones, the spectral sensitivity range of photographic materials, the spectral response range of detectors and the spectral transmission range of optical materials.

Figure 20.1 Infrared recording and the electromagnetic spectrum The ...

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