The Indication Error of Thick Glass Light Transmittance Meter
What is the indication error of the light transmittance meter? The indication error is also called accuracy. The light transmittance of different brands of light transmittance meters is different. The measurement data of the high precision light transmittance meter will be more accurate.
All the light transmittance meters have an indication error, and this indication error is also called accuracy. There are many brands of light transmittance meters, and the transmittance of different brands of light transmittance meters are different, so when testing the same material, the test data of different light transmittance meters will not be same. The only method to identify the accurate one is to send the light transmittance meter to an authoritative metrology institute for inspection.
According to the Chinese National Standard JJF1225-2009 "Corrosion Specifications for Automotive Light Transmittance Meters", the light source of the light transmittance meter must meet the CIE visual function standard.
The Linshang Technology LS116 Transmittance Meter is an instrument that complies with the CIE visual function standard. It can pass the detection by the Chinese National Metrology Institute. The indication error of the LS116 light transmittance meter is within ±2%, and the measurement data is very accurate.
In addition, the light source in the instrument forms a perfect parallel light path through the refraction of multiple lenses. We all know that when the parallel light is incident perpendicularly from the air into another medium, no refraction occurs, and the light will follow the original path. Therefore, when testing the glass with a large thickness, the LS116 light transmittance meter can also ensure the accuracy of the data.
In the above figure, we tested a large thickness of glass using the LS116 transmittance meter. From the figure we can know that the transmittance of this glass is 82.11%, and the accuracy of the LS116 transmittance meter is ±2%, so we can judge the true light transmittance of this glass is between 80.11% and 84.11%.
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