Two-dimensional contour imaging with a fiber optic microbend tactile sensor array

Emge, S.; Chen, Chin‐Lin

doi:10.1016/0925-4005(91)85005-4

Cited by 16 publications

(4 citation statements)

References 11 publications

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“…The design of the sensor matrix however does not allow shape recognition of an object or multi-touch sensitivity, because the sensor and the signal transmission element are combined in one entity. A more complex approach would be needed for such requirements [18, 21, 25-27]. …”

Section: Resultsmentioning

confidence: 99%

Textile Pressure Sensor Made of Flexible Plastic Optical Fibers

Rothmaier

Luong

Clemens

2008

Sensors

168

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In this paper we report the successful development of pressure sensitive textile prototypes based on flexible optical fibers technology. Our approach is based on thermoplastic silicone fibers, which can be integrated into woven textiles. As soon as pressure at a certain area of the textile is applied to these fibers they change their cross section reversibly, due to their elastomeric character, and a simultaneous change in transmitted light intensity can be detected. We have successfully manufactured two different woven samples with fibers of 0.51 and 0.98 mm diameter in warp and weft direction, forming a pressure sensitive matrix. Determining their physical behavior when a force is applied shows that pressure measurements are feasible. Their usable working range is between 0 and 30 N. Small drifts in the range of 0.2 to 4.6%, over 25 load cycles, could be measured. Finally, a sensor array of 2 × 2 optical fibers was tested for sensitivity, spatial resolution and light coupling between fibers at intersections.

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Section: Resultsmentioning

confidence: 99%

Textile Pressure Sensor Made of Flexible Plastic Optical Fibers

Rothmaier

Luong

Clemens

2008

Sensors

168

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“…In contrast to [ 23 ], not the losses were evaluated, but the coupling between two crossing fibres. Similar concepts had already been proposed in [ 19 , 20 ] and also by Schoenwald et al [ 21 ], which relied on two different layers of crossing fibres. Rothmaier et al presented a textile integration of this pressure sensor [ 25 ], but none of the aforementioned methods were fully compatible with textile technology nor did they provide simultaneous sensing at different locations.…”

Section: Introductionmentioning

confidence: 72%

“…There have been several proposals for optical force sensors using polymer optical fibres (POF), which are more robust. Initially, POF pressure sensor technology was—and still is—used in the field of robotics [ 19 , 20 , 21 , 22 ]. In [ 23 ] for instance, the losses induced by macro bending in a POF arrays have been used as sensor signal.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Fibre Cross-Coupling Mechanisms in Fibre-Optical Force Sensors

Bunge

Kallweit

Colakoglu

et al. 2021

Sensors

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The force-enhanced light coupling between two optical fibres is investigated for the application in a pressure or force sensor, which can be arranged into arrays and integrated into textile surfaces. The optical coupling mechanisms such as the influence of the applied force, the losses at the coupling point and the angular alignment of the two fibres are studied experimentally and numerically. The results reveal that most of the losses occur at the deformation of the pump fibre. Only a small percentage of the cross-coupled light from the pump fibre is actually captured by the probe fibre. Thus, the coupling and therefore the sensor signal can be strongly increased by a proper crossing angle between the fibres, which lead to a coupling efficiency of 3%, a sensitivity improvement of more than 20 dB compared to the orthogonal alignment of the two fibres.

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“…This principle has been applied so far only in few textile applications. Sensor arrays, where optical fibers are placed in warp and weft direction of weaves, allow the determination of touch, pressure and location [32][33][34]. A different approach for a pressure sensor array is presented in [35], in which elastomeric POF were squeezed and deformed rather than bent.…”

Section: Introductionmentioning

confidence: 99%

Photonic textiles for pulse oximetry

Rothmaier¹,

Selm²,

Spichtig³

et al. 2008

Opt. Express

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Biomedical sensors, integrated into textiles would enable monitoring of many vitally important physiological parameters during our daily life. In this paper we demonstrate the design and performance of a textile based pulse oximeter, operating on the forefinger tip in transmission mode. The sensors consisted of plastic optical fibers integrated into common fabrics. To emit light to the human tissue and to collect transmitted light the fibers were either integrated into a textile substrate by embroidery (producing microbends with a nominal diameter of 0.5 to 2 mm) or the fibers inside woven patterns have been altered mechanically after fabric production. In our experiments we used a two-wavelength approach (690 and 830 nm) for pulse wave acquisition and arterial oxygen saturation calculation. We have fabricated different specimens to study signal yield and quality, and a cotton glove, equipped with textile based light emitter and detector, has been used to examine movement artifacts. Our results show that textile-based oximetry is feasible with sufficient data quality and its potential as a wearable health monitoring device is promising.

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Two-dimensional contour imaging with a fiber optic microbend tactile sensor array

Cited by 16 publications

References 11 publications

Textile Pressure Sensor Made of Flexible Plastic Optical Fibers

Textile Pressure Sensor Made of Flexible Plastic Optical Fibers

Analysis of Fibre Cross-Coupling Mechanisms in Fibre-Optical Force Sensors

Photonic textiles for pulse oximetry

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