Measuring UV intensity
An Ultravoilet light is divided into three bands UVA, UVB, UVC.
- UVA : It is long wave UV transparent wavelength, 315 nm to 400 nm UV transparent. It causes skin tan, skin elasticity and collegen fibers.
Uses: Curing Lamps in the Curing Industries.
- UVB : It is Medium wave UV with erythema effect, wavelength 280 nm to 320 nm. It promotes Vitamin D formation in body., but exposure for long time is not recommended
Uses : In Health care Physiotherapy Lamps
- UVC : It is short wave with bacterial effect wavelength, 200 nm to 280 nm. It is very harmful , for long term exposure causes skin Cancer.
Uses: In Hospitals Germicidal Lamps
There are three fundamental parameter for UV m,measurement. These are wavelength, energy density and irradiance.
Wavelength: To measure the wavelength we require a Spectroradiometer ( They can measure individual peaks) or spectrometer.
Irradiance: Intensity is the output energy of UV source. The amount of UV falling on a surface is called irradiance. A cm2 is that area which is used to track the UV from all angles and is determined by direct measurements. It is measured in Watt/cm2 or mW/cm2 .
UV Energy Density:It is exposure cof UV light with time factor. That is 1 watt for 1 sec equal 1 joule. It is measured in Joules/cm2 or mJ/cm2 .
Now it is very important to understand your UV measuring instrument. It will help you and the customers to better understand the readings.
What Factors Cause
- Potential confusion
- Measurement Errors
Some factors which influence Irradiance Measurements are:
- Cosine error
UVB or UVA light sources irradiation intensity can be detected by the UV lamp intensity meter. Multi-probe UV measurement device that can be equipped with probes: No matter you want to test the UVA,UVB or UVC band. You can select a suitable probe.