Fiber optic measurement system having a reference conductor for controlling the energy level of the light source
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United States of America Patent
Stats
-
Nov 12, 1991
Grant Date -
N/A
app pub date -
Aug 30, 1990
filing date -
Aug 30, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A source fiber receives light from a light source and conducts the light through a catheter to transmit the light to a reflective surface at the catheter end. The reflective surface has a predetermined range of movement and forms a reflected beam from the light transmitted by the source fiber. A reference fiber is located such that it is entirely within the reflected beam throughout the entire range of movement of the reflective surface and its output is substantially constant throughout that range of movement. The output of the reference fiber is used to adjust the light output of the light source. A signal fiber is located such that it is covered by the reflected beam to an extent which is dependent upon the position of the reflective surface in its range of movement. The light output of the signal fiber changes by a relatively large amount through the range of movement of the reflective surface and its output may be used to determine the position of the reflective surface.
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