Passive Imaging
Who are we?
The workshop and exhibition
Resources and information
St Andrews <

Imaging <
The Basics

Applications <
The Universe
Brijot Imager
Car Radar
Debris Detection
Aircraft Landing

Downloads <
Teacher Pack
Workshop Outline
Project Outline
Project Evaluation
Cheltenham Eval
IR/mmw/Thz Eval
BA Festival Eval
External links
Photo gallery

To the left you can see three pictures taken with three different types of camera: visible, infrared and millimetre wave. The infrared and millimetre wave cameras show heat coming from the body which you can't see with normal ‘visible’ light

Nearly all objects and materials emit a range of wavelengths of light in a way which depends on their temperature.

Objects have to be ‘red hot’ (about 500ºC) before they visibly glow. Objects at room temperature emit most of their heat in the infrared part of the spectrum, but some of the heat is also emitted at longer wavelengths

Infrared wavelengths are longer than those of visible light so the image is more coarse - in other words it has less RESOLUTION. The millimetre wave image is even coarser because the wavelength is longer still

But you can also see through things with millimetre waves because they behave more like radio signals. The hair and beard appear cold in the IR since they are insulating but the millimetre wave image doesn’t see the hair and beard at all - the heat passes straight through!

'Vision For The Future' is an EPSRC funded project run by the MMW group at the University of St Andrews
Copyright ©2006 by the University of St Andrews :: web, graphic and exhibition design by FifeX Ltd,