Patent ID: 6469794
Filing Date: 2002-10-22
Classification: G01N

Abstract:
Apparatus for inspecting the interior of a device under test through a single port in the device under test comprising:laser means for producing laser energy; beam splitter means for directing said laser energy to a first direction and to a second direction; delay means receiving said laser energy from said second direction for introducing a an amount of controllable delay to said laser energy from said second direction and outputting said delayed laser energy from said second direction; optical routing means receiving said laser energy from said first direction for directing said laser energy from said first direction to ones of a first at least one optical fibers that enter said device under test through said port, and for transmitting laser energy reflected from interior surfaces of said device under test to ones of a second at least one optical fibers; elongate dye-cell means receiving said laser energy reflected from said interior surfaces of said device under test at a first end and said delayed laser energy from said second direction at a second end for creating two-photon fluorescence between said laser energy reflected from said interior surfaces of said device under test and said delayed laser energy from said second direction and outputting said two-photon fluorescence; wherein said amount of controllable delay is representative of said interior surfaces of said device under test.