PRODUCTION OF DISTINGUISHABLE LIGHT UNDER THE PRESENCE OF AMBIENT LIGHT

摘要

PROBLEM TO BE SOLVED: To provide an apparatus and method for producing distinguishable light in the presence of ambient light.

SOLUTION: The method and apparatus for producing distinguishable light in the presence of ambient light is disclosed. This method involves admitting light in a first wavelength band through a first admission port into a first optical cavity at least partially defined by a first reflector operably configured to reflect light form the first optical cavity. The method also involves filtering ambient light reflected into the first optical cavity and entering and exiting a first space defined around the first light admission port so that ambient light outside the first wavelength band is attenuated when ambient light enters and exits into and from the first space.

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