HunterLab manufactures, directional 45/0 instruments and also diffuse sphere instruments, with diffuse/8˚ geometry. The UltraScan PRO, UltraScan VIS, ColorQuest XE, and ColorQuest XT are all bench top sphere instruments available from HunterLab.
Measuring in reflectance with sphere instruments, the sample is illuminated from all directions (diffusely) and the detector receives reflected light at 8˚ from the normal to the sample surface. This allows the instruments to measure in specular-included or specular-excluded modes. When specular-excluded mode is used the specular reflectance is eliminated. This is especially helpful when measuring product in a glass sample cup as it the shine from the surface of the cup is negated. However, most reflectance measurements on sphere instruments are taken in specular-included mode.
Sphere instruments also have the ability to measure samples in transmittance mode. Transmittance mode is used to measure translucent or transparent materials and these can be either liquids or solids. HunterLab sphere instruments (except for the ColorQuest XT) also have the ability to measure Haze. Haze measurement serves to indicate internal scattering.
HunterLab sphere instruments are a popular choice for many industries because of their versatility. Not only can sphere instruments take transmittance and haze measurements, but they can also measure in specula- included and -excluded reflectance modes. These features make HunterLab sphere instruments a good fit for a wide variety of applications.
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