A new and miniature imaging device is being developed to allow flexible endoscopy in regions of the body that are difficult to reach. The scanning fiber endoscope employs a single scanning optical fiber to illuminate a target area, while backscattered light is detected one pixel at a time to build a complete image. During each imaging cycle the fiber is driven outward in a spiral pattern from its resting state at the image center to the outer fringe of the image. At this point, the fiber is quickly driven back to its initial position before acquiring a subsequent frame. This work shortens the time between successive images to achieve higher overall frame rates by applying a carefully timed input, which counteracts the tip motion of the scanning fiber, quickly forcing the scanning fiber to the image center. This input is called motion braking and is a square wave function dependent upon the damped natural frequency of the scanning fiber and the instantaneous tip displacement and velocity. Imaging efficiency of the scanning fiber endoscope was increased from 75–89% with this implementation.

References

References
1.
Seibel
,
E. J.
, 2008, “
1-mm Catheterscope
,” in
Optical Fibers and Sensors for Medical Diagnostics and Treatment Applications VIII
, Proc. SPIE,
6852
, p.
685207
.
2.
Seibel
,
E. J.
,
Brown
,
C. M.
,
Dominitz
,
J. A.
, and
Kimmey
,
M. B.
, 2008, “
Scanning Single Fiber Endoscopy: A New Platform Technology for Integrated Laser Imaging, Diagnosis, and Future Therapies
,”
GI Endoscopy Clinics of North America
(in press).
3.
Seibel
,
E. J.
,
Johnston
,
R. S.
, and
Melville
,
C. D.
, 2006, “
A Full-Color Scanning Fiber Endoscope
,” in
Optical Fibers and Sensors for Medical Diagnostics and Treatment Applications VI
, Proc. SPIE,
6083
, p.
608303
.
4.
Smithwick
,
Q. Y.
,
Vagners
,
J. J.
,
Reinhall
,
P. G.
, and
Seibel
,
E. J.
, 2006, “
An Error Space Controller for a Resonating Fiber Scanner: Simulation and Implementation
,”
Trans. ASME J. Dyn. Syst. Meas. Control
,
128
(
4
), pp.
899
913
.
5.
Smithwick
,
Q. Y.
,
Vagners
,
J. J.
,
Reinhall
,
P. G.
, and
Seibel
,
E. J.
, 2003, “
Modeling and Control of the Resonant Fiber Scanner for Laser Scanning Display or Acquisition
,”
SID Symp. Digest Tech. Papers
,
34
(
2
), pp.
1455
1457
.
6.
Thomson
,
W. T.
, and
Dahleh
,
M. D.
, 1993,
Theory of Vibration with Applications
,
Prentice Hall
,
Upper Saddle River, NJ
.
7.
Meirovitch
,
L.
, 2001,
Fundamentals of Vibrations
,
McGraw-Hill
,
Boston, MA
.
8.
Schowengerdt
,
B. T.
,
Kundrat
,
M. J.
,
Lee
,
C. M.
,
Johnston
,
R. S.
,
Melville
,
C. D.
,
Reinhall
,
P. G.
, and
Seibel
,
E. J.
, 2008, “
Miniature Wide-Throw-Angle Scanning Fiber Projection Display
,”
SID Symp. Dig. Tech. Papers
,
39
,pp.
2102
2105
.
9.
Kundrat
,
M. J.
,
Reinhall
,
P. G.
,
Lee
,
C. M.
, and
Seibel
,
E. J.
, 2011, “
High Performance Open Loop Control of Small Cylindrical Cantilever Beams
,”
J. Sound Vib.
,
330
, pp.
1762
1771
.
You do not currently have access to this content.