Solar radiation in the band of 200-280nm will be completely absorbed by the ozone layer during the process of passing through the atmosphere. The atmosphere below the ozone layer

The scattering effect of other components and the surface ozone also absorb it, which makes a natural "dark room" formed near the ground-where the natural solar-blind ultraviolet light signal is almost completely undetectable.

Ultraviolet lens is an ultraviolet system with a certain spectral range, and the chromatic aberration of the optical system needs to be corrected to ensure that the system has good performance. One of the important methods for correcting the chromatic aberration of the optical system is to use the different dispersion properties of optical materials for reasonable power distribution. However, due to the limited choice of ultraviolet optical materials and the small difference in dispersion coefficient, the chromatic aberration correction of the ultraviolet optical system has certain difficulties. In addition, in order to improve the signal-to-noise ratio of the system, an optical system with a large relative aperture is required. The aberration correction of an optical system with a relatively large aperture needs to choose an optical material with a high refractive index, but the refractive index of the ultraviolet transmission material is low (less than 1.46), resulting in an increase in the number of transmission elements in the optical system or an increase in the thickness of the lens, and therefore The transmittance of the optical system is reduced, which partially offsets the net optical gain obtained by the large relative aperture

Ultraviolet lens use:

Search for potential fingerprints, footprints, hide bloodmarks, fibers and other physical evidence

Search for physical evidence such as gunshot residues, human body spots, blood stains, bite marks, etc.

Improve the extraction rate of photographs of finger prints treated with fluorescent reagents

Document security feature recognition under daylight conditions (passport, license plate, etc.)

Bank bill feature confirmation (with fluorescent mark)

SN	Part #	EFL(mm)	Wavelength(nm)	F#	SPECS
1	UV2535	25	280	3.5
2	UV3535	35	240-290	3.5
3	UV7510	75	280	10.0
4	UV20065	200	308	6.5
5	UV20065	200	308	6.5