Ultraviolet light meter is a special instrument for measuring luminosity and brightness.
It is to measure the light intensity (illuminance) is the degree to which the object is illuminated, that is, the ratio of the luminous flux obtained on the surface of the object to the illuminated area.
Ultraviolet light meter is also called ultraviolet light meter, ultraviolet intensity meter, etc.;
He mainly measures the intensity of ultraviolet radiation;
It is used for ultraviolet radiation measurement in the fields of photochemistry, polymer material aging, flaw detection, ultraviolet light source, plant cultivation, large-scale integrated circuit lithography, etc.
The principle of UV light meter is:
Photovoltaic cells are photoelectric elements that directly convert light energy into electrical energy.
When the light hits the surface of the selenium photocell, the incident light passes through the metal film 4 and reaches the interface between the semiconductor selenium layer 2 and the metal film 4, and a photoelectric effect is generated on the interface.
The magnitude of the potential difference is proportional to the illuminance on the light-receiving surface of the photovoltaic cell.
At this time, if an external circuit is connected, a current will flow through, and the current value will be indicated on a microammeter with lux (Lx) as the scale.
The magnitude of the photocurrent depends on the intensity of the incident light and the resistance in the loop.
The illuminance meter has a shifting device, so it can measure high illuminance and low illuminance.
