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Frontiers of Optoelectronics

ISSN 2095-2759

ISSN 2095-2767(Online)

CN 10-1029/TN

Postal Subscription Code 80-976

Front. Optoelectron.    2016, Vol. 9 Issue (4) : 621-626    https://doi.org/10.1007/s12200-016-0537-z
RESEARCH ARTICLE
Design of temperature insensitive in vivo strain sensor using multilayer single mode optical fiber
F. MAKOUEI,S. MAKOUEI()
Faculty of Electrical and Computer Engineering, University of Tabriz, Tabriz 51664, Iran
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Abstract

Bone strain measurement is a case of interest and demanding task for osteogenic adaption responses. In this paper, a novel biocompatible optical sensor for the bone axial strain measurement was proposed. In case modern multilayer single mode WII type optical fibers are well designed, they exhibit superior characteristics compared to conventional metal strain gauges (SGs). Furthermore, they could be strong competitors for SGs based on fiber Bragg grating (FBG) devices. In this study, mode field diameter (MFD) was selected as the indirect parameter for sensing task, which was totally a new approach. The strain sensitivity of 70.7733 pm/µε was obtained. Moreover, temperature sensitivity was –3.0031 × 106 pm/°C, which was negligible and removed the temperature compensation complexity for the sensor structure presented. The satisfactory property achieved for the designed sensor is as a result of multilayer fiber’s complicated structure as well as the design procedure based on evolutionary genetic algorithm (GA). In addition, the sensor demonstrated a reliable performance as its sensitivity was independent of the magnitude of the applied load.

Keywords bone strain      in vivo      optical strain gauge (SG)      genetic algorithm (GA)     
Corresponding Author(s): S. MAKOUEI   
Issue Date: 29 November 2016
 Cite this article:   
F. MAKOUEI,S. MAKOUEI. Design of temperature insensitive in vivo strain sensor using multilayer single mode optical fiber[J]. Front. Optoelectron., 2016, 9(4): 621-626.
 URL:  
https://academic.hep.com.cn/foe/EN/10.1007/s12200-016-0537-z
https://academic.hep.com.cn/foe/EN/Y2016/V9/I4/621
Fig.1  Index of refraction profile for the proposed structures (WII)
Fig.2  Axial bone strain
G/(°) H/(°) lg/µm a/(°)
-1.6548×10-6 31.7794×10-6 0.109 0.45×10-6
Tab.1  Interpolated coefficient in the relation of Eq. (8)
Fig.3  Scheme of design procedure based on GA
Fig.4  MFD vs. compressive (−-) and tensile (+) strain
parameter a P Q D R1 R2
optimum value 2.2462 µm 0.70788 0.2950 0.00455 1.339 −0.721
Tab.2  GA results for optimal values of geometrical and optical parameters
Fig.5  MFD vs. strain and temperature
Fig.6  Sensor sensitivity vs. applied strain
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