Miniature fiber optic pressure sensor with composite polymer-metal diaphragm for intradiscal pressure measurements

Silas C. Nesson; Miao Yu; X. M. Zhang; Adam H. Hsieh

doi:10.1117/1.2967908

1 July 2008 Miniature fiber optic pressure sensor with composite polymer-metal diaphragm for intradiscal pressure measurements

Silas C. Nesson, Miao Yu, X. M. Zhang, Adam H. Hsieh

Author Affiliations +

Journal of Biomedical Optics, Vol. 13, Issue 4, 044040 (July 2008). https://doi.org/10.1117/1.2967908

Abstract

We developed a miniature fiber optic pressure sensor system and utilized it for in vitro intradiscal pressure measurements for rodents. One of the unique features of this work is the design and fabrication of a sensor element with a multilayer polymer-metal diaphragm. This diaphragm consists of a base polyimide layer (150 nm thick), a metal reflective layer (1 μm thick), and another polyimide layer for protection and isolation (150 nm thick). The sensor element is biocompatible and can be fabricated by simple, batch-fabrication methods in a non-cleanroom environment with good device-to-device uniformity. The fabricated sensor element has an outer diameter of only 366 μm, which is small enough to be inserted into the rodent discs without disrupting the structure or altering the intradiscal pressures. In the calibration and in vitro rodent intradiscal pressure measurements, the sensor element exhibits a linear response to the applied pressure over the range of 0–70 kPa, with a sensitivity of 0.0206 μm/kPa and a resolution of 0.17 kPa. To our best knowledge, this work is the first successful demonstration of rodent intradiscal pressure measurements.

©(2008) Society of Photo-Optical Instrumentation Engineers (SPIE)

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Silas C. Nesson, Miao Yu, X. M. Zhang, and Adam H. Hsieh "Miniature fiber optic pressure sensor with composite polymer-metal diaphragm for intradiscal pressure measurements," Journal of Biomedical Optics 13(4), 044040 (1 July 2008). https://doi.org/10.1117/1.2967908

Published: 1 July 2008

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KEYWORDS

Sensors

Fiber optics sensors

Polymers

Fiber optics

Polymeric sensors

Metals

Fiber optics tests

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