UV Illuminance and UV Radiation Illuminance Meter
Ultraviolet illuminance represents a radiation function density of ultraviolet light, that is, the power of radiant energy per square centimeter. The unit is: microwatt/square centimeter (μW/cm2). The long-term application of ultraviolet rays will cause the gradual weakening of the irradiation intensity. In daily production and life, ultraviolet radiation illuminance meters are often used to detect the intensity of ultraviolet radiation on the surface of objects, that is, ultraviolet illuminance. Therefore, the ultraviolet light meter is also often called the ultraviolet light meter.
The entire range of ultraviolet rays in the solar spectrum is in the wavelength range of 200nm-380nm. At the same time, ultraviolet rays are subdivided into long-wave UVA ultraviolet bands, medium-wave UVB ultraviolet bands and short-wave UVC ultraviolet bands according to different wavelengths. Ultraviolet rays are a kind of physical optics. The penetration ability of ultraviolet rays with different wavelengths is different. The shorter the wavelength, the stronger the penetration ability of objects. Ultraviolet technology is widely used in different industries in daily life and industrial production.
Among them, long-wave UVA ultraviolet rays are often used in UV curing technology. UV curing technology is a technology that quickly hardens and dries in seconds after irradiating UV light (main wavelength 365nm) on UV curable resins such as coatings, adhesives or inks containing photopolymerizable prepolymers, photopolymerizable monomers, and photoinitiators. However, the usual thermal drying method and the superposition reaction method in the two-liquid mixing method generally require several minutes to several hours to dry the resin.
In order to achieve better results in UV curing technology, it is necessary to detect the ultraviolet illuminance during the curing process. To detect the ultraviolet intensity of UV curing, a UVA ultraviolet illuminance meter with the corresponding band should be used.
UVC ultraviolet rays are mainly used in the sterilization and disinfection of the surface of objects. Traditional sterilization methods generally use heating, dosing and other means, but these treatment methods take a long time, which may cause adverse changes to the treated objects and cause secondary pollution to the environment. Sterilization by irradiating ultraviolet rays can completely avoid the above problems. Ultraviolet rays with a wavelength of 200-280nm can penetrate the cell membrane of bacteria and viruses, damage nucleic acid (DNA), and cause cells to lose their ability to reproduce, achieving a rapid sterilization effect.
However, in order to achieve a satisfactory sterilization effect by using UVC ultraviolet sterilization and disinfection, it is necessary to ensure the irradiation intensity of ultraviolet rays. To detect the UVC ultraviolet radiation intensity of ultraviolet sterilization, it is necessary to use the corresponding UVC ultraviolet irradiance meter. Among the subdivided ultraviolet rays of three different bands, UVA and UVC are used in more industries than UVB ultraviolet rays.
The UV illuminance meter uses 35 different measuring probes to measure UVA, UVB, and UVC ultraviolet rays in different bands. Humanized operation, small and flexible, can be operated with one hand, the probe is separated from the body, which is convenient and simple, and has an automatic clearing function, which can store multiple sets of data.
It can be widely used in sanitation, medical treatment, chemical industry, sanitation, food, electronics, aerospace and other industries, and is suitable for ultraviolet irradiance measurement in fields such as ultraviolet sterilization, physiotherapy, fluorescence analysis, ultraviolet lithography, water treatment, and breeding.
Ultraviolet radiation illuminance meters are distinguished by photoelectric conversion devices, mainly including silicon (selenium) photocell illuminance meters and photoelectric tube illuminance meters. The illuminance value is generally displayed by numbers, so it is also called a digital UV illuminance meter. No matter what kind of illuminance meter, it is composed of a photometric probe, a measurement or conversion circuit, and a display instrument.
Spectral responsivity is the ratio of the output value of the photocurrent or voltage generated by the detector under the irradiation of monochromatic radiation with a wavelength of 0 to the flux of the monochromatic radiation. The principle is that a photoelectric cell is a photoelectric element that directly converts light energy into electrical energy. When light hits the surface of the selenium photovoltaic cell, the incident light passes through the metal thin film and reaches the interface between the semiconductor selenium layer and the metal thin film, generating a photoelectric effect on the interface.
