UV Intensity Units and The Conversion
The "UV" in the UV energy unit is actually a shorthand for the word "ultraviolet". So what are the UV energy units? First, let's take a look at the following energy units. The international common energy units are GJ, MJ, KJ, and J/joule.
The uv energy unit is simply a type of energy unit. The energy unit of light intensity is generally expressed by J/m2 and mJ/cm2, that is, the light energy per unit area. So what is the conversion rate between the UV energy units and UV light intensity measurement units? Please look below:
1. UV energy units
1J/cm² = 1000mJ/ cm² = 1000000uJ/ cm²
1J/m² = 1000mJ/ m² = 1000000uJ/ m²
1J/m² = 0.1mJ/ cm²
In the parameter list of many uv energy meters on the market, there are not only "UV energy measurement range" but also "UV power / UV light intensity measurement range". In fact, the two are simply not separable because of "energy = power * time". Since the power is mentioned in the formula, what is the UV intensity units in the UV energy meter?
2. UV intensity unit(UV light intensity measurement units):
1 Joule (J) = 1 Newton * Meter = 1 Watt (W) * Second (S)
1W/m² = 103 mW/ m² = 106 μW / cm²
1W/m² = 1000mW / 10000 cm² = 0.1 mW / cm² = 100 μW / cm²
And the power unit: E = W * t
1 W = 103 mW (milliwatts) = 106 uW (microwatts)
Usually we will see such a UV energy unit in the UV energy parameter table, sampling speed: "xxxx times / sec". So what does this UV energy unit mean in the uv energy meter? Simply speaking, the power value is constantly changing during the measurement process and xxxx times/second is the sampling speed of the uv energy meter per second. So why is the sampling speed so fast? That is because the power value is varied. Calculating the energy value requires accumulating the power value. The faster the sampling speed, the more accurate the energy accumulation value. When the sampling speed reaches 2000 or above, the change in the power value is small and can be neglected.
So when you see that some UV energy metershave slow sampling speeds, the seller tells you how accurate their uv energy meter is. Don't believe that, it must be a lie!
The above is the conversion rate of the UV energy meter light energy unit, UV intensity unit, power unit and their relationship! More information about "How to caculate the UV intensity and UV energy".