Measurement sphere (Koala)

Outline


Measurement sphere system
(Koala)


658nm at 12KW on thermister


Note1:
Relative to BaSO4
Glass diffuser includes
specular component

Sphere dia: 30cm, diffuse wall reflectivity>0.95, Sphere Optics

3 side ports for measurement, 1 top port and 1 bottom sample port; 2 holes on top port gate, for in/out laser beams

2 J.C.Stover Optical scattering, p-170

Usage of measurement sphere system:

Fiber coupled LD illuminated sphere wall luminance is measured and compared, where stray light in the sphere measured 3×10-4 cd/m2.

diffuse reflectivity cardboard

black-paint sprayed cardboard
equivalent to PVC w/ paint

BaSO4

black flock paper

frost glass diffuser

0.44

0.03

0.95

0.005

0.08

Oxide Corporation

Speckle contrast Measurement System