There must be at least one excitation and one collecting
fiber in the traditional fiber endface probe used to
quantify fluorescence. The lighted and probed regions might overlap thanks to a
quartz shield that is attached to the distal end of the fibers. The percentage
of overlapping rises when the numerical aperture of the fibers and shield
thickness are both increased. A greater diameter shield is necessary for a
deeper shield.
A fiber optic probe with slanted transmission and
receiving fibers is disclosed for detecting dispersed light. These fibers are
bundled to produce a bevel at the probe's tip. The transmitting and receiving
fibers stored inside the probe's housing, which has a transparent window along
the length of its tip, are protected by this. By cutting, polishing, and other
methods, the end faces of the fibers are angled such that they lie in a plane
that is not parallel to the longitudinal axis of each fiber. The fibers are
positioned such that lines normal to the slanted end faces are divergent
concerning one another and are held in the probe's tip using epoxy.
The epoxy is tapered such that the transmitting fiber,
the epoxy, and the receiving fiber create a bevel of no more than 20 degrees.
The epoxy is positioned essentially between the transmitting and receiving
fibers. The light cones are directed toward one another by the tilted fiber
endface probe, improving the effectiveness of light coupling.
The epoxy contains a light absorber, such as carbon black, to lessen the
crosstalk between the transmitting and receiving fibers.
The end face of an optical connection or split fiber may
be inspected using fiber optic inspection microscopes.
Fiber optic connection termination inspection and fiber
patch panel ferrule inspection are two common applications for fiber optic
microscopes on the market.
For single-mode fiber applications, fiber scopes may
magnify up to 200X or 400X; for multimode applications, a low-cost 100X variety
is offered. The latter is frequently a part of tool kits for fiber optic
termination.
Video fiber endface microscope is used for ferrule inspection. They consist of a portable LCD device and a compact, lightweight probe with a CCD camera and a long-lasting LED light source. When the probe adapter tip connects to the connection, an LCD is shown that shows tiny particles and end-face damage in crisp, clear detail
