Less light

Less Light reduces heat and stress on the objects

With no Bayer pattern filtration, no optical low pass filter and no IR cutting filter on the CCD of Tech Vision EV Multispectral system, the amount of light needed to illuminate an object is reduced by about 3 f-stop. 

The narrow-band LED of the EV Light does not emit IR or UV with every exposure (unlike strobes and most other light sources) . This greatly reduces heat and stress on the object and with less heat, there is no risk of registration error due to the object expanding.

Efficient use of light

Ordinary photography, which employs broad-band white light, exposes the object to a great deal of unnecessary light energy.  The majority of this light is then discarded by the filtration system in a RGB digital camera. 

With narrow band LED illumination of the Tech Vision EV Multispectral system, no filtration is required.  The light energy is used much more efficiently, and only sufficient light to properly expose the objects in the spectral band of interest is generated.  There is no unnecessary light energy being created. This means that the object is subject to less light stress, and the lighting system requires dramatically less power. 

Typically, an area CFA (color filter array) image capture requires about 10 times more light energy directed onto the document surface for an equivalent exposure by the Tech Vision EV Multispectral system.

A linear (line-scan) CFA with constant uniform illuminant requires several thousand time more light energy compared to the Tech Vision EV Multispectral system.

Hyperspectral Imaging