Definitions

Phosphorescence is the physical property whereby a material if excited by the correct wavelength of energy produces an afterglow after the excitation source has been removed, normally at a longer wavelength.The persistence or time, intensity and colour of the afterglow will be specific to a particular phosphor and may or may not be visible to the human eye. It will also be a function of various factors including ambient temperature, the condition of the material and the energy level of excitation.Materials which exhibit a wavelength conversion yet do not display afterglow are described as Fluorescent. The conversion is virtually instantaneous and the effect only persists whilst the excitation source is present.

Phosphor Meter - PM102D

Portable Measurement of Ultraviolet PhosphorescenceThe PM102D from DaRo UV Systems provides rapid, portable and reliable comparator measurement of the intensity decay of phosphorescent materials. It is used for research or quality control purposes. Users include security printers, ink/dye manufacturers, display sign manufacturers etc.

• Adjustable gain control making comparisons possible
• Can be simply interchanged
• Adjustable inspection time delay

Fluorecsence METER - FM103

Portable Measurement of Ultraviolet FluorescenceThe FM103 from DaRo UV Systems provides instantaneous comparator measurement of UVA fluorescent effects. Designed for portable use, but can be permanently fitted, the unit is compact and rugged and requires only a 12 volt power source.Suitable for laboratory or quality control purposes the FM103 may be used to define the fluorescence of paper, ink/dyes, invisible tracers, security documents, fluorescent powders and some minerals.

• Readings are independent of daylight
• Colour filtration available on specification
• Can trigger an adjustable alarm