Stretch sensors for human body motion

O'Brien, Ben; Gisby, Todd; Anderson, Iain A.

doi:10.1117/12.2046143

Cited by 48 publications

(36 citation statements)

References 16 publications

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“…In order to achieve this, we need a model that can represent the DE as sections that can be measured separately. One such model is the transmission line 5,12 , which is a distributed representation of the DE ( Figure 2). In this model, the DE consists of smaller sections, each representing a portion of the overall length.…”

Section: = (1)mentioning

confidence: 99%

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Localised strain sensing of dielectric elastomers in a stretchable soft-touch musical keyboard

Tairych

Anderson

2015

SPIE Proceedings

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We present a new sensing method that can measure the strain at different locations in a dielectric elastomer. The method uses multiple sensing frequencies to target different regions of the same dielectric elastomer to simultaneously detect position and pressure using only a single pair of connections. The dielectric elastomer is modelled as an RC transmission line and its internal voltage and current distribution used to determine localised capacitance changes resulting from contact and pressure.This sensing method greatly simplifies high degree of freedom systems and does not require any modifications to the dielectric elastomer or sensing hardware. It is demonstrated on a multi-touch musical keyboard made from a single low cost carbon-based dielectric elastomer with 4 distinct musical tones mapped along a length of 0.1m. Loudness was controlled by the amount of pressure applied to each of these 4 positions.

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confidence: 99%

“…Recent advances in soft material research, particularly in the field of electroactive polymer sensors have shown great potential and compatibility with the human body 5,6 . In particular, dielectric elastomers (DE) have featured in numerous applications from sports coaching 7 to health monitoring 8,9 .…”

Section: Introductionmentioning

confidence: 99%

Localised strain sensing of dielectric elastomers in a stretchable soft-touch musical keyboard

Tairych

Anderson

2015

SPIE Proceedings

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“…In dielectric elastomer sensors (DES) a change of the electric capacitance can be measured when the elastomer film is mechanically deformed by an external force [14][15][16][17][18]. The capacitance of the compliant capacitor is enhanced by the increase of the electrode area and the simultaneous decrease of the distance between the electrodes upon the deformation, resulting in a very simple load sensor.…”

Section: Introductionmentioning

confidence: 99%

Influence of design and material properties on the performance of dielectric elastomer compression sensors

2015

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New designs of dielectric elastomer sensors (DES) which are capable to detect compression loads on rigid as well as on compliant surfaces are introduced in this paper. Currently, DES films exhibit only very poor sensitivity in terms of the change of electric capacitance upon increasing loads for compression measurements. In the new sensor mats, the compression load is converted to a tensile load which acts on an elastomer film located between two profiled elastomer components. In addition, the deformation of the elastomer profiles can also contribute to the sensor effect. All elastomer components were prepared of silicone. A number of parameters which have an influence on the characteristic dependence of capacitance on compression load are discussed. A main influence results from the shape of the elastomer profiles which stretch the elastomer film inside. Also very important are the number and the locations of electrode layers in the sensor mat between which the capacitance is measured. Finally, the hardness of the elastomer plays also a decisive role for the sensor sensitivity. This broad variability of the sensor design offers a high potential to tune the sensor characteristics. Various examples of compression sensors are described and the impact of structural and material parameters is discussed

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“…Visual-based HPR systems, such as the ones described in [1,2,6], are quite accurate, inexpensive and unobtrusive, but they are not suitable for ambulatory monitoring during daily life activities. In contrast, glove-based HPR devices, relying on off-the-shelf flex sensors [3,10], dielectric elastomer stretch sensors [11], optical fibers [12], or inertial measurement units [4], are intrinsically ambulatory, but they are often less usable than visual-based systems due to obtrusive wiring and rigid sensor technology that does not adapt to the dynamically changing hand shape of the users. Indeed, the human body, and the human hand in particular, have a high number of degrees of freedom (DOFs) that act on a continuously compliant structure.…”

Section: Introductionmentioning

confidence: 99%

A Multi-Modal Sensing Glove for Human Manual-Interaction Studies

et al. 2016

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Abstract:We present an integrated sensing glove that combines two of the most visionary wearable sensing technologies to provide both hand posture sensing and tactile pressure sensing in a unique, lightweight, and stretchable device. Namely, hand posture reconstruction employs Knitted Piezoresistive Fabrics that allows us to measure bending. From only five of these sensors (one for each finger) the full hand pose of a 19 degrees of freedom (DOF) hand model is reconstructed leveraging optimal sensor placement and estimation techniques. To this end, we exploit a-priori information of synergistic coordination patterns in grasping tasks. Tactile sensing employs a piezoresistive fabric allowing us to measure normal forces in more than 50 taxels spread over the palmar surface of the glove. We describe both sensing technologies, report on the software integration of both modalities, and describe a preliminary evaluation experiment analyzing hand postures and force patterns during grasping. Results of the reconstruction are promising and encourage us to push further our approach with potential applications in neuroscience, virtual reality, robotics and tele-operation.

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Stretch sensors for human body motion

Cited by 48 publications

References 16 publications

Localised strain sensing of dielectric elastomers in a stretchable soft-touch musical keyboard

Localised strain sensing of dielectric elastomers in a stretchable soft-touch musical keyboard

Influence of design and material properties on the performance of dielectric elastomer compression sensors

A Multi-Modal Sensing Glove for Human Manual-Interaction Studies

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