Image Processing Reference
In-Depth Information
Figure1.44 Composite visible and UV (240-280 nm) image of power line corona.
(Courtesy of Ofil Ltd., Nes-Ziona, Israel)
betas are moving faster than the local speed of light in water, electromagnetic shock
waves are produced which lead to the emission of blue and UV light. Figure 1.45
shows the effect of this so-called Cherenkov radiation. UV cameras are used to
image cassettes of spent fuel. This allows inspectors to verify the presence of fuel
rods, since the rods glow with a distinctive spectrum heavily weighted towards the
UV.
InfraredPhotographyandHeatDetection
Many people are under the impression that the infrared photographic film described
earlier enables one to take photographs of people or other warm objects in total
darkness. This is quite incorrect. In fact, people do radiate infrared light that can
reveal them even in total darkness, but that light is known as midwave or longwave
infrared (MWIR and LWIR), which has wavelengths that are up to ten times
longer than the wavelength of near-IR light. MWIR and LWIR light emissions are
not detectable with conventional infrared film.
Figure1.45 Visible (left) and near-UV (right) images of fuel rod assembly in a storage
pond. The missing rods make the marked holes glow brighter because nothing is blocking
the light paths. (Photo courtesy of Channel Systems)
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