How to Calculate UV energy and intensity by UV integrator?
Linshang UV integrator measures the real-time, maximum, and cumulative energy values of UV intensity. 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.
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 curing efficiency and even affect the curing.
2. The 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. From the above, we know that the intensity of the UV lamp will be attenuated, so the different UV rays on the same production line are impossible to maintain the same intensity, and even the intensity of the same UV lamp will vary with factors such as the supply voltage and the measurement position. The farther the detector of the UV integrator is from the UV lamp, the lower the measured intensity value, and vice versa. Therefore, it is impossible to use the intensity at a certain time multiplied by the time to obtain the energy value accumulated over a period of time.
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.