Reflectance Standards / Reflectance standards
Sarspec has available two types of reflectance standards, for diffuse and specular reflectance.
The specular reflectance type consists of a 50 mm mirror with fused silica substrate coated with Al-MgF2 for high specular reflectivity in a wavelength range from 250 to 2500 nm.
For diffuse reflectance all Sarspec standards use optical PTFE which consists of a pure polytetrafluorethylene (PTFE) disc with 50 mm diameter. As a result of its incomparable whiteness and purity, optical PTFE achieves virtually ideal Lambertian reflectance properties with a reflectivity coefficient of up to 98% in a broad wavelength range from 250 to 2500 nm. Aditional advantages when using optical PTFE is its high UV stability, universal chemical resistance and can be easily cleaned.
Sarspec offers one specular standard and three diffuse standards corresponding to reflectivities of 98%, 50% and 10%. There’s also the possibility of customization for different sizes or reflectivities.
|Parameter||Diffuse reflectance||Specular reflectance|
|Material||Optical PTFE||Fused Silica / Al-MgF2|
|Diameter||50 mm||50 mm|
|Thickness||10 mm||12 mm|
|Wavelength range||250-2500 nm|
|Max. Temperature||260º C||80º C|
|Housing||Black anodized aluminium|
|Diffuse Reflectance Standard, PTFE, 98% Reflectance||DRSTD98|
|Diffuse Reflectance Standard, PTFE, 50% Reflectance||DRSTD50|
|Diffuse Reflectance Standard, PTFE, 10% Reflectance||DRSTD10|
|Specular Reflectance Standard||SRSTD|