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Optical Sensors

Localized active-cladding optical fiber bend sensor

[+] Author Affiliations
Robb M. Gavalis

Tufts University, Mechanical Engineering Department, 200 College Avenue, Medford, Massachusetts 02155

Peter Y. Wong

Tufts University, Mechanical Engineering Department, 200 College Avenue, Medford, Massachusetts 02155

Jessica A. Eisenstein

Tufts University, Mechanical Engineering Department, 200 College Avenue, Medford, Massachusetts 02155

Lothar Lilge

University of Toronto, Medical Biophysics Department, Ontario Cancer Institute, 610 University Ave. Rm. 7-416, Toronto, Ontario M5G 2M9, Canada

Caroline G. L. Cao

Tufts University, Mechanical Engineering Department, 200 College Avenue, Medford, Massachusetts 02155

Opt. Eng. 49(6), 064401 (June 15, 2010). doi:10.1117/1.3449110
History: Received October 30, 2009; Revised April 13, 2010; Accepted April 26, 2010; Published June 15, 2010
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We present the design and fabrication of a novel fiber optic multiparameter bend sensor. Unlike current intrinsic fiber optic multiparameter bend sensors that depend on multiple cores or multiple fibers, the new sensor is based on three circumferential active-cladding point modifications on a single optical fiber at specific axial locations along the length of the fiber. A commercial 30-WCO2 laser is used to cut three point modifications in the plastic cladding of the fiber. Each of the three defects is filled with fluorophores (quantum dots) with different peak emission wavelengths. A 405-nm laser (operating at 10-mW) is used to excite the quantum dots, while a spectrometer, coupled to the fiber, measures the emission signals of each of the three fluorophores simultaneously. Results show that bending direction and degree of curvature at a single localized modification region can be expressed as a function of the three fluorescence intensities.

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© 2010 Society of Photo-Optical Instrumentation Engineers

Citation

Robb M. Gavalis ; Peter Y. Wong ; Jessica A. Eisenstein ; Lothar Lilge and Caroline G. L. Cao
"Localized active-cladding optical fiber bend sensor", Opt. Eng. 49(6), 064401 (June 15, 2010). ; http://dx.doi.org/10.1117/1.3449110


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