Check every element for ultraviolet transmission
Ultraviolet imaging shows surface detail, coatings and contamination that visible light does not, because short wavelengths scatter from finer structure and many materials absorb UV. The camera sensor is only one part: ordinary lens glass, filters and protective windows absorb ultraviolet, so each element in the optical path has to be chosen for the wavelength.
- Compare the spectral range of the selected model with the wavelength of the UV light, and use a lens and filter rated for that band.
- Decide whether the task is reflected-UV imaging or visible fluorescence excited by UV; fluorescence may only need a UV light, a blocking filter and a visible camera.
- Shield the station and follow the eye and skin safety limits for the UV source, and check that fixtures and parts tolerate the exposure.
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