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Technical Information

Considerations for Sphere Selection
Several factors need to be considered when determining the integrating sphere size that is appropriate for your application. Three of the most important factors are:

Diameter/Source Size
The sphere diameter should be at least 1 1/2 times the largest dimensions of any device mounted within the sphere.

Surface to Port Area
Proper integrating within an integrating sphere is insured when not more than 5% of the sphere wall surface area is taken up by ports. If port requirements exceed that percentage, a larger sphere should be considered. Port area and sphere surface area can be determined by the following simple formulas:

Port Area = r2
Sphere Surface Area = D2
r = port area, D = sphere diameter

Integrating Sphere Coatings
In order to deliver reliable integration and low throughput loss, the coating of the integrating sphere must be a very efficient diffuse reflector. The reflectance must be high in order to minimize absorption loss due to multiple reflections, but it must not reflect light in a specular sense.

Coatings used on Labsphere integrating spheres offer reflectance efficiencies between 95 and 99%. When a perfect diffuse reflector is illuminated with uniform intensity, it behaves as a perfect diffuse source - a Lambertian source. Labsphere's Spectralon, Spectraflect, Duraflect and Infragold coatings provide these excellent Lambertian properties.

Sphere Selection Chart
The following chart is provided as a comparison index for the integrating spheres described in this section. We hope it will assist you in quickly locating a sphere for your application. View Sphere Selection Chart


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