Knowledge Book for UV Illuminance Meters
Overview of UV illuminance meter
UV illuminance meter, also known as UV irradiance meter, UV intensity meter, etc., he mainly measures the intensity of ultraviolet radiation, used in photochemistry, polymer materials aging, flaw detection, UV light source, plant cultivation, large-scale integrated circuits photolithography and other fields of UV radiation measurement work.
The UV illuminometer uses 35 different detectors to measure UVA, UVB, UVC, visible light and infrared light. The measurement wavelength of UV illuminance meter is divided into UVA (320nm-380nm), UVB (280nm-320nm), UVC (200nm-280nm), and some products can detect a wide range of wavelengths, user-friendly operation, compact and flexible, can be operated by one hand, the probe is separated from the body, convenient and simple, and more automatic memory function, can store 20 groups of data, can be Widely used in health, medical, chemical, sanitation, food, electronics, aerospace and other industries, suitable for UV, physical therapy, fluorescence analysis, UV lithography, water treatment, breeding and other fields of UV irradiance measurement.
Principle of UV illuminance meter
UV illuminance meter is a special measurement of luminosity, brightness of the instrumentation. It is to measure the intensity of light (illuminance) is the degree of illumination of the object, that is, the ratio of the luminous flux received by the surface of the object to the area illuminated. Illuminance meter is usually composed of selenium photocell or silicon photocell and microampere meter. The principle is: photocell is the photoelectric element that converts light energy directly into electrical energy. When light is directed to the surface of the selenium photovoltaic cell, the incident light reaches the dividing surface of the semiconductor selenium layer 2 and the metal film 4 through the metal film 4, and produces a photoelectric effect at the interface. The magnitude of the potential difference generated is proportional to the illuminance on the light-receiving surface of the photocell. At this point, if an external circuit is connected, a current passes through, and the value of the current is indicated from a microampere meter graduated in lux (Lx). The magnitude of the photocurrent depends on the intensity of the incident light and the resistance in the circuit. The illuminance meter has a variable gearing device, so that it can measure high illuminance as well as low illuminance.
