Biomedical Engineering Reference
In-Depth Information
Sensitive Layer
Reflector
Catheter
Plastic Optical
Fibers
Figure 6.2-27 Gastroenterology usage of fiber optics.
The sensor shown in
Figure 6.2-27
uses two dyes.
Chromophores, immobilized on controlled pore glasses,
are fixed at the end of plastic optical fibers. The distal end
of the fibers is heated and the CPG forms a very thin
pH-sensitive layer on the fiber tips. The probe has four
fibers (two for each chromophore). The use of LEDs as light
sources, solid-state detection, and an internal micropro-
cessor makes this a truly portable, battery-powered sensor.
References
Bruce, R. V. 1973.
Alexander Graham Bell
and the Conquest of Solitude.
Gollanez,
London.
Cherin, A. H. 1983.
An Introduction to
Optical Fibers.
McGraw-Hill,
New York.
Hall, R. N., G. E. Fenner, J. D. Kingsley,
T. J. Soltys, and R. O. Carlson. 1962.
''Coherent light emissions from GaAs
Junction.''
Phys. Rev. Lett.
9, 366.
Kao, K. C., and G. A. Hockham. 1966.
''Dielectric fiber surface waveguides for
optical waveguides.''
Proc. Inst. Electr.
Eng.
133, 1151.
Kapron, F. P., D. B. Keck, and R. D.
Maurer. 1970. ''Radiation losses in glass
optical waveguides.''
Appl. Phys. Lett.
17, 423.
Maiman, T. H. 1960. ''Stimulated optical
radiation in ruby.''
Nature
(London)
6, 106.
Morse, P. M., and H. Feshbach. 1953.
Methods of Theoretical Physics, Part II
.
McGraw-Hill, New York.
Nathan, M. I., W. P. Dumke, G. Burns,
F. H. Dill, Jr., and G. Lasher. 1962.
''Stimulated Emissions of Radiation
from GaAs p-n Junctions.''
Appl. Phys.
Lett.
1, 62.
