Praying Mantis Diffuse Reflectance Accessory
Praying Mantis Diffuse Reflectance Accessory
Praying Mantis Diffuse Reflectance Accessory
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How do you measure how good a sphere is?<br />
• Sphere Multiplier “M” – a measure of the efficiency of<br />
the sphere.<br />
• Calculated from the reflectivity and the port fraction.<br />
• Bigger is better<br />
• M isn’t everything<br />
• Think of the light being diluted across the surface of the sphere<br />
• Light is more concentrated in a smaller sphere<br />
Sphere diameter<br />
Sphere Surface<br />
Area (mm 2 )<br />
Port Fraction<br />
f<br />
Sphere Multiplier<br />
M<br />
% of incident light falling on<br />
64 mm 2 detector port<br />
60 mm 11310 11.3 8.1 4.6<br />
70 mm 15394 9.3 9.7 4.0<br />
75 mm 17671 3.6 21.7 7.9<br />
150 mm 70686 2.5 28.5 2.6<br />
Erich Heiden UV/Vis Salesmanager<br />
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