Introduction to the working principle of UV illuminance meter
Ultraviolet illuminance meter is a specialised instrument for measuring luminosity and brightness.
It is the measurement of light intensity (illuminance) is the degree of the object is illuminated, that is, the surface of the object received by the luminous flux and the ratio of the illuminated area.
Ultraviolet illuminance meter is also known as ultraviolet irradiance meter, ultraviolet intensity meter and so on;
He mainly measures the intensity of ultraviolet radiation;
Used in photochemistry, polymer materials aging, flaw detection, ultraviolet light source, plant cultivation, large-scale integrated circuit lithography and other fields of ultraviolet radiation measurement work.
The principle of UV illuminance meter is:
Photocell is a 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.
