Abstract: The present invention relates to an ultraviolet radiation detector in general and more specifically to a solar blind ultraviolet radiation detector; that is, a detector insensitive to the radiation of sunlight reaching the earth's surface but sensitive to UVC wavelengths in the spectrum, defined as the interval 200 nm-280 nm. The solar blind detector is base on the use of photochromic compounds in conjunction with ultraviolet wavelength-selective chemical blocks and their incorporation into optically clear polymer matrices. The photochromic compound is selected from the group comprising spiropyran molecules spirooxazine molecules and chromene derivatives. Applications for such device are as numerous as the sources of UVC radiation. An obvious use for such Solar Blind UVC detector is monitoring the output of UVC sources used in the decontamination of water and air (water treatment and air purification) and for sterilization of medical instruments.

Abstract: The present invention teaches a method for making a photochromic ultraviolet protective shield. The UV blocking eyewear uses a material which changes color when exposed to UV radiation. The obtained visible color is directly proportional to the intensity of ultraviolet light impinging the material. The photochromic ultraviolet protective shield is made by adjunction of photochromic compounds to a host polymer matrix. Incorporation of photochromics into a polymeric matrix involves the technique of injection molding, extrusion molding or cell-casting. This invention will offer the advantages i) to protect the eye or the face by absorbing the dangerous ultraviolet rays such as UV laser radiation ii) to reduce glare and squinting of the eye by automatically darkening in sunlight.

Abstract: The present invention teaches an ultraviolet active wristband. The ultraviolet active wristband is made of the same materials as any wristband already in the market. However, the present wristband has the intriguing propriety of changing color reversibly from clear to any visible color (violet, blue, red, orange, yellow . . . ) when exposed to an ultraviolet source. The wavelength interval of the ultraviolet source is ?250 nm-400 nm!. Therefore, it is also sensitive to the spectrum of ultraviolet sunlight that is ?290 nm-400 nm!. The active chemical is a photochromic substance such as spiropyrans, spiroxazines.

Abstract: A metamorphic nail polish capable of color changing from clear to any visible color (violet, red, blue, yellow . . . ) in presence of sunlight or a any ultraviolet radiation source. The nail polish will go back to colorless as soon as it is removed from the sunlight or the UV source. The present nail polish is capable of undergoing multiple reversible changes without altering its physical properties. The active chemical is a photochromic substance such as spiropyrans or spiroxazines molecules. The photochromic compound is added to any clear nail polish to form a composition sensitive to UV radiation. The composition is not toxic and does not cause skin irritation. It may be directly applied on the nail or on top of a previously applied colored enamel.

Abstract: An Ultraviolet detector based on the propriety of a photochromic composition in changing its color upon exposure to UV rays is described. The said photochromic composition contains a spiropyran or a spiroxazine molecule previously dissolved in a non-polar solvent such as toluene, cyclohexane, then mixed to clear plastics to be incorporated in any item e.g. watch, credit card, sunscreen bottle cap. The present UV sensor can also be used as a sun shading technique on a windshield of an automotive vehicle.