Common Use Errors of Gloss Measurement
1. Gloss and Gloss Measurement Device -Gloss Meter
Gloss is the property of a surface which involves specular reflection. Specular reflection is a sharply defined light beam resulting from reflection off a smooth, uniform surface. Gloss follows the law of reflection which states that when a ray of light reflects off a surface, the angle of incidence is equal to the angle of reflection.
Gloss meter is a precision glossiness measurement device . When using gloss meter, many people find the measured gloss value is inaccurate. Inaccurate data may caused by improper operation. We list some common errors when using gloss meter. Hope these information can help you.
2. The Common Use Errors of Gloss Measurement
(1) Light leakage causes gloss measurement error
The be measured surface must covered the measuring aperture, the light spot of LS192 mirror gloss meter is 9mm*15mm, i.e. The be measured area must bigger than 9mm*15mm, and surface should be flat. For small size surface, Small aperture mirror gloss meter is recommended.
(2) Improper clean for the gloss meter standard plate
Strict cleanliness of standards plate is a must, ordinary paper towels and cloth is not up to the standard plate cleanliness requirements. We must use the enclosed special lens cloth or lens paper provided by the gloss meter supplier to clean the standard plate.
The holder removed from the main device should be kept in a safe and clean place to prevent from damage or pollution.
(3) Glossiness measurement in environment with huge temperature differences
When the meter is taken from a cold location to a hot environment, (For example, in winder, from outside to inside room ) moisture condensation occurs easily. If so don't use the meter any more and wait for the moisture to evaporate.
Since big temperature difference between environment and the meter would badly affect measuring accuracy. In this case, please wait for a period of time till the temperature get to a balance and then calibrate the gloss meter again.If measurement operation last a long time, for example an hour or more, it's necessary to recalibrate the meter.
(4) Gloss measurement under strong light
All the optical instruments, as far as possible to avoid the influence of outside light, when stray light irradiate on the contact surface of the sample ,stray light will affect the instrument measuring accuracy.
If necessary, especially under strong light, shade it with a piece of light-tight cloth.
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