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outside of automotive because of the cost of equipment was high and the demand
for high quality gloss finish was not as crucial.
The Novo-Gloss IQ measures the DOI of a surface by quantifying the way a
reflected measurement beam is spread and distorted around the specular angle.
An example of test panel with low and high DOI values. Orange peel, texture, flow out and other key parameters can be
assessed in coating applications where high gloss quality is becoming increasingly important.
The DOI value of a surface is number between zero and one hundred; a surface
that exhibits a perfect undistorted image returns a value of 100, as the values
decrease and as the image becomes less discernable.
Measuring DOI with the Novo-Gloss IQ
The Novo-Gloss IQ can measures DOI at 20⁰ and 60⁰ degrees,
20⁰ is the prescribed angle for DOI measurement in ASTM D5767.
Due to the larger measurement spot size at 60⁰, tests have shown that this angle is
more sensitive to longer wave length ripples than 20⁰.
RSpec- Peak Specular Reflectance
Peak specular reflectance is a measure of the peak gloss value of a surface; this
value is obtained very close to the specular angle.