Page 303 - Modern Optical Engineering The Design of Optical Systems

282 Chapter Twelve

If we cut two small holes in the sphere, one to admit light and the
other (in a location not directly illuminated by the first hole) for a light
sensor, we have a device which can read the amount of radiation
admitted into the sphere without any variation of sensitivity resulting
from the direction of the light, the size of the beam, or the position of
the beam in the admitting hole. The total radiation emitted by a lamp
or other source which is placed inside the sphere can readily be mea-
sured. Conversely, if the light sensor is replaced by a source of light,
then the other hole becomes an almost perfect, uniform, unpolarized,
lambertian source of radiation. The area of the holes should not exceed
2 percent of the area of the sphere, the integrating sphere is an excellent
device to measure the transmission of a lens.

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