Compressive and tensile strain sensing using a polymer planar Bragg grating

Rosenberger, M.; Hessler, Steffen; Belle, Stefan; Schmauß, Bernhard; Hellmann, Ralf

doi:10.1364/oe.22.005483

Cited by 40 publications

(18 citation statements)

References 23 publications

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“…In these diagrams the vertical axis shows the relative Bragg wavelength shift of the two gratings (left) and the applied force (right) over time of the strain test program according section 2 (dash dotted line). Figure 2a depicts the behavior of a PPBG strained alongside the waveguide (angle of 0°, blue line), revealing a response upon tensile and compressive strain previously reported by our group [5]: tensile strain alongside the grating results in a spectral red shift due to an increase of the grating period. Accordingly, compressive strain leads to a blue shift.…”

Section: Characteristics Of 2d Ppbg Multi Axial Strain Sensormentioning

confidence: 60%

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Multi-axial strain sensing using polymer planar Bragg gratings

et al. 2014

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Section: Characteristics Of 2d Ppbg Multi Axial Strain Sensormentioning

confidence: 60%

“…Presently, mainly Bragg gratings in polymer optical fibers (POF) are used for these devices although they can only be loaded with tensile strain [2,3]. In contrast, polymer planar Bragg gratings (PPBG) consisting of bulk Polymethylmethacrylat (PMMA) have been proven to be capable for measuring both tensile and compressive strain [4,5].…”

Section: Introductionmentioning

confidence: 99%

Multi-axial strain sensing using polymer planar Bragg gratings

et al. 2014

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“…Such, the grating wavelength of an FBG fi ber has to be reassessed after curing due to possible contractions of the host polymer fi lm. [ 159 ] The integrated grating can be stretched with the bulk PMMA and such show a response to compression or tension. The sensing response has to be calibrated and should only be infl uenced by one parameter, e.g., bending angle.…”

Section: Flexible Hosts For Optical Fiber Embeddingmentioning

confidence: 99%

Body‐Monitoring and Health Supervision by Means of Optical Fiber‐Based Sensing Systems in Medical Textiles

Quandt

Scherer

Boesel

et al. 2014

Adv Healthcare Materials

128

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Long-term monitoring with optical fibers has moved into the focus of attention due to the applicability for medical measurements. Within this Review, setups of flexible, unobtrusive body-monitoring systems based on optical fibers and the respective measured vital parameters are in focus. Optical principles are discussed as well as the interaction of light with tissue. Optical fiber-based sensors that are already used in first trials are primarily selected for the section on possible applications. These medical textiles include the supervision of respiration, cardiac output, blood pressure, blood flow and its saturation with hemoglobin as well as oxygen, pressure, shear stress, mobility, gait, temperature, and electrolyte balance. The implementation of these sensor concepts prompts the development of wearable smart textiles. Thus, current sensing techniques and possibilities within photonic textiles are reviewed leading to multiparameter designs. Evaluation of these designs should show the great potential of optical fibers for the introduction into textiles especially due to the benefit of immunity to electromagnetic radiation. Still, further improvement of the signal-to-noise ratio is often necessary to develop a commercial monitoring system.

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“…Opposite to fiber based Bragg gratings which are limited to tensile strain measurements, inscribing PPBG into bulktype polymer platelets is favorable for the measurement of both tensile and compressive strain and, in addition, permits mechanical loading from different angles with respect to the waveguide orientation [4,5].…”

Section: Two Gratings In One Chip -Multi Axial Strain Sensingmentioning

confidence: 99%

Polymer Planar Bragg Gratings

2015

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Combining the advantageous properties of cyclo olefin copolymers (COC) with a rapid UV laser based fabrication process, we highlight the generation of planar waveguide Bragg gratings suitable for multi-axial strain sensing (Fig. 1). Bragg gratings are optical filters reflecting a small wavelength band, which is determined by the spatial grating period and the effective refractive index. As both determining factors depend, e. g., on mechanical load conditions and temperature, measuring the reflected Bragg wavelength facilitates optical sensing of these conditions.Optical fiber based Bragg gratings exemplify a well-established representative of optical sensors, being applied in structural health monitoring and temperature sensing. Based on their expedient properties, such as their lower Young's modulus and higher breaking elongation, cost-effective polymers are attractive alternatives to silica fiber based Bragg grating sensors. In addition, the possibility to create planar waveguide structures including Bragg gratings simplifies mechanical handling and load transmission into the device and, opposite to fiber based sensors, facilitates both tensile and compressive strain sensing. Among various available polymers, especially cyclo olefin copolymers are promising materials since they exhibits a high glass transition temperature and low water absorption, the later reducing an objectionable cross sensitivity to ambient humidity under which other prominent polymers such as PMMA suffer.In this article, we summarize our recent work on polymer based planar Bragg gratings in cyclo olefin copolymers ( Fig. 2) with emphasis on multiaxial strain sensing by introducing multiple waveguide gratings at different angles in one planar structure. The unique combination of these structures in a cost-effective substrate material and a rapid fabrication technique afford polymer planar Bragg gratings promising applications in optical multi-axial strain sensing.Cyclo olefin copolymerhigh T g and low water absorption Polymers are subject to ongoing research in the field of optical fiber sensing as they feature significant advantages as compared to silica based devices, e. g. biocompatibility, cost efficient processability and a higher Young's modulus. Especially, polymethyl methacrylate (PMMA) is commonly used for polymer optical fibers, despite its high affinity to absorb water and its low glass

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Compressive and tensile strain sensing using a polymer planar Bragg grating

Cited by 40 publications

References 23 publications

Multi-axial strain sensing using polymer planar Bragg gratings

Multi-axial strain sensing using polymer planar Bragg gratings

Body‐Monitoring and Health Supervision by Means of Optical Fiber‐Based Sensing Systems in Medical Textiles

Polymer Planar Bragg Gratings

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