How to Calculate UV energy and intensity by UV integrator?

From:Linshang Time:2019/09/09 16:20:00 Browse:1228

How to calculate UV energy and intensity of curing light sources? UV integrator is a professional UV measurement device used to measure the ultraviolet energy and irradiation intensity (optional) of the UV curing light sources. UV light sources are widely used in UV curing industries. High pressure mercury lamps play a big part in the curing industry in the past days. Now more and more people tend to use UV LED light sources.

UV curing light sources working principle: UVLED uses the principle of light-emitting diodes to generate characteristic ultraviolet (UV) light. When the traditional mercury lamp is energized, arcs are generated at both poles. As the voltage increases and the temperature rises, the mercury evaporates, generating mercury vapor arcs and emitting characteristic ultraviolet (UV) light. Different halogen coatings will have different wavelength output characteristics. 

Linshang UV integrator measures the real-time, maximum and cumulative energy values of UV light sources. Many customers is curious about how UV energy and intensity are calculated after use, why energy is not equal to intensity multiplied by time. Before understanding the calculation method of UV energy and intensity, we can first understand the knowledge of UV integrator and UV lamp attenuation.

1. What is the attenuation of the UV lamp?

UV lamps are widely used in UV curing, UV exposure, UV printing and other industries. UV integrators can be used to detect the intensity and energy value of UV lamps. However, the UV lamp has a long service life. It should be noted that the life of the UV lamp does not mean that it cannot be used any more. However, the UV light produced by the UV lamp is not strong enough to cause energy damage when the same power is input. Therefore, the attenuation of the UV lamp can reduce the UV curing efficiency and even affect the UV curing effect.

2. Function of UV LED integrator

The UV lamp can detect the intensity of the UV lamp to determine whether the UV lamp is attenuated. You can also check the distribution of the UV intensity through the power curve of the energy meter to find the UV lamp with attenuation or even damage, and confirm the curing process parameters through the data.

3. How to calculate UV energy and Intensity?

Assuming that the intensity value of the UV lamp is constant, then the UV energy and intensity calculation method is the intensity multiplied by the time equal to the energy. This method may seem a little complicated for most people to understand. We can use Linshang UV integrator to help us calculate the UV energy and UV light irradiation intensity. 

  1. Long press the "POWER" button to select the mode in the Off state.

  2. When selecting the auto mode, set the trigger power first, when the measured power reach the set trigger power, the meter will start measurement.

  3. Point the light source at the receving probe, the meter will automatically count the maximum power and real time power, ultraviolet energy and measurement time.

  4. Take away the light source, the meter will stop measuring when there is no ultraviolet light.

  5. After test, short press the "POWER" button to check the power curve.

UV integrator
UV integrator

4. Relationship between UV intensity and UV energy

From the above figure, we can see that the intensity of ultraviolet light is not a straight line. The maximum value of ultraviolet intensity during this period is 1.8mW/cm2, the minimum value is 0 mW/cm2 and the total measurement duration is 7.7s. UV energy is the integral value of intensity versus time. The area enclosed by this curve and the time axis represents the energy value accumulated during this time. If the maximum power value is multiplied by the time, the resulting data must be greater than the area of the graph, and the actual energy value is not obtained.

In fact, the UV integrator can obtain a large amount of intensity value data P1, P2, P3,…, Pn in this period by fast sampling of the instrument, and multiply the intensity values of different sizes by time to obtain multiple energy values, and finally the sum of these energy values gives the total energy value during this time. In an ideal state, if an infinite number of intensity values can be obtained, the true energy value can be calculated. However, in actual measurement, the accuracy of the energy value is related to the sampling speed of the UV energy meter. The faster the sampling speed, the more accurate the calculated energy value.

The above is all the answers to the calculation of UV energy and intensity. If you have more questions, please feel free to contact Linshang Technology's technical service staff. For more information about the high temperature resistance of the UV energy meter, please refer to "Use Time of Linshang UV Energy Meter at Different High Temperature.

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