Fabrication and evaluation of a notched polymer optical fiber fabric strain sensor and its application in human respiration monitoring

This paper describes an intensity-based notched polymer optical fiber (POF) fabric strain sensor and its application in human respiration monitoring. A mechanical analysis illustrates geometrical profiles of constrained fiber loops on the fabric substrate. V-shaped notches are made by laser ablation on the sides of the POFs. The effects of loop parameters and processing conditions on the sensing performance are investigated. The experimental results show that the fabric sensor is more sensitive to strain with notches on the outer side of the loops, a small radius of the loops and a low scanning speed of laser. This fabric sensor exhibits a large measurable strain range of up to 21%. The achieved strain sensitivity is 3.77. The temperature and relative humidity have little effect on strain sensitivity between 0℃ and 60℃. A belt has been fabricated by integrating the fabric sensor for monitoring human respiration. The evaluation trials show a strong correlation between the belt system and a clinic monitor.

[1]  T. S. Chuan,et al.  Rapid Constructions of Microstructures for Optical Fiber Sensors Using a Commercial CO2 Laser System , 2008, The open biomedical engineering journal.

[2]  Mauro Lomer,et al.  Principle of functioning of a self-compensated fibre-optical displacement sensor based on diffraction-grating-ended POF , 2004 .

[3]  K.S.C. Kuang,et al.  An evaluation of a novel plastic optical fibre sensor for axial strain and bend measurements , 2002 .

[4]  Patricia Scully,et al.  Sensing applications for POF and hybrid fibres using a photon counting OTDR , 2007 .

[5]  Gerard Franklyn Fernando,et al.  An intensity-based optical fibre sensor for fatigue damage detection in advanced fibre-reinforced composites , 1995 .

[6]  Xm M. Tao,et al.  Fabric strain sensor integrated with looped polymeric optical fiber with large angled V-shaped notches , 2012 .

[7]  Y. C. Chen,et al.  Power loss characteristics of a sensing element based on a grooved polymer optical fiber under elongation , 2008 .

[8]  Ian Bennion,et al.  Strain and temperature sensitivity of a single-mode polymer optical fiber. , 2005, Optics letters.

[9]  A. Djordjevich,et al.  Principles of deflection-curvature measurement , 2001 .

[10]  Anatoly Babchenko,et al.  Graded-index plastic optical fiber for deformation sensing , 2007 .

[11]  C. Pulido,et al.  Improved fluorescence signal with tapered polymer optical fibers under side-illumination , 2010 .

[12]  Zhihao Chen,et al.  Plastic optical fiber microbend sensor used as breathing sensor , 2012, 2012 IEEE Sensors.

[13]  Anatoly Babchenko,et al.  Plastic optical fibre with structural imperfections as a displacement sensor , 2006 .

[14]  B. Condon,et al.  Thermal injuries associated with MRI. , 2001, Clinical radiology.

[15]  Guang Feng Wang,et al.  Inscription of Polymer Optical Fiber Bragg Grating at 962 nm and Its Potential in Strain Sensing , 2010, IEEE Photonics Technology Letters.

[16]  Hypolito José Kalinowski,et al.  A fibre optic Bragg grating strain sensor for monitoring ventilatory movements , 2001 .

[17]  R. N. Karekar,et al.  An optical fiber weighing sensor based on bending , 2008 .

[18]  F. Pirotte,et al.  Optical Fiber Sensors Embedded Into Medical Textiles for Healthcare Monitoring , 2008, IEEE Sensors Journal.

[19]  João L. Pinto,et al.  A reliable low-cost wireless and wearable gait monitoring system based on a plastic optical fibre sensor , 2011 .

[20]  Byoungho Lee,et al.  Review of the present status of optical fiber sensors , 2003 .

[21]  Taesung Kim,et al.  An evaluation of the optical fiber beam as a force sensor , 2009 .

[22]  Yunjiang Rao,et al.  A prototype fibre-optic-based Fizeau medical pressure and temperature sensor system using coherence reading , 1994 .

[23]  F. Narbonneau,et al.  OFSETH: Smart medical textile for continuous monitoring of respiratory motions under magnetic resonance imaging , 2009, 2009 Annual International Conference of the IEEE Engineering in Medicine and Biology Society.

[24]  H. Tam,et al.  Trans-4-stilbenemethanol-doped photosensitive polymer fibers and gratings. , 2004, Optics letters.

[25]  Mervyn J. Kowalsky,et al.  Validation of a single-mode polymer optical fiber sensor and interrogator for large strain measurements , 2011 .

[26]  Jerome L. Myers,et al.  Research Design and Statistical Analysis , 1991 .

[27]  Libo Yuan,et al.  Embedded white light interferometer fibre optic strain sensor for monitoring crack-tip opening in concrete beams , 1998 .

[28]  Ian Bennion,et al.  Application of long-period-grating sensors to respiratory plethysmography. , 2007, Journal of biomedical optics.

[29]  Andreas T. Augousti,et al.  Improved fibre optic respiratory monitoring using a figure of eight fiber optic coil , 2005 .