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Surface type Reflectivity Reference

Matt High PTFE reference plate

Matt Low

Labsphere diffuse

reflectance standards

Glossy High

Protruding PTFE

reference plate

Glossy Low NIST SRM 2021

The Troubleshooting section contains information on the available reference surfaces.

Figure 5: Highly diffuse samples are measured against a flat PTFE reference plate

Figure 6: The protruding PTFE reference plate more accurately emulates highly

specular samples

Inaccuracy in the standard

If the standard material used to calculate a value is not accurate, this will hamper the

determination of the reflectance of the sample. Great care must be taken to keep

reference materials clean and unscratched.

For a detailed discussion on the factors affecting the measurement of diffuse

reflectance and transmittance with integrating spheres, refer to reference (2).

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Mantis 5000 Specifiche Pagina 8