Passive tactile sensor for measuring elastic modulus of soft material: Continuum-mechanics model and experiment

Wang, Fang Fang; Shen, Jingjin; Wu, Ya Yong

doi:10.1016/j.sna.2018.10.006

Cited by 5 publications

(3 citation statements)

References 27 publications

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“…Various approaches to tactile sensing have been demonstrated. Most tactile sensors utilize a microelectromechanical system (MEMS) technology based on piezoresistive or capacitive effects. − The external force leads to a structural deformation, which then causes a measurable change in the sensor’s resistance or capacitance. Using an array of MEMS structures can enable the mapping of an external force field .…”

Section: Resultsmentioning

confidence: 99%

Ultrathin Tactile Sensors with Directional Sensitivity and a High Spatial Resolution

et al. 2021

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An ultrathin tactile sensor with directional sensitivity and capable of mapping at a high spatial resolution is proposed and demonstrated. Each sensor node consists of two gallium nitride (GaN) nanopillar light-emitting diodes. Shear stress applied on the nanopillars causes the electrons and holes to separate in the radial direction and reduces the light intensity emitted from the nanopillars. A sensor array comprising 64 sensor nodes was designed and fabricated. Two-dimensional directional sensitivity was experimentally confirmed with a dynamic range of 1−30 mN and an accuracy of ±1.3 mN. Tracking and mapping of an external force moving across the sensor array were also demonstrated. Finally, the proposed tactile sensor's sensitivity was tested with a fingertip gently moving across the sensor array. The sensor successfully registered the finger movement's direction and fingerprint pattern.

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Section: Resultsmentioning

confidence: 99%

Ultrathin Tactile Sensors with Directional Sensitivity and a High Spatial Resolution

et al. 2021

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“…Other MEMS (micro-electromechanical systems)-based tactile sensors deduce applied forces by monitoring changes in piezo resistance and capacitance [ 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 ]. Scaling these sensors for a large area (>1 mm 2 ) while maintaining high spatial-resolution sensing requires high-quality fabrication control, thus increasing sensor cost.…”

Section: Introductionmentioning

confidence: 99%

Direct Shear Stress Mapping Using a Gallium Nitride LED-Based Tactile Sensor

Dvořák

Fazeli

2023

Micromachines

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An experiment was performed to calibrate the capability of a tactile sensor, which is based on gallium nitride (GaN) nanopillars, to measure the absolute magnitude and direction of an applied shear force without the need for any post-processing of data. The force’s magnitude was deduced from monitoring the nanopillars’ light emission intensity. Calibration of the tactile sensor used a commercial force/torque (F/T) sensor. Numerical simulations were carried out to translate the F/T sensor’s reading to the shear force applied to each nanopillar’s tip. The results confirmed the direct measurement of shear stress from 3.71 to 50 kPa, which is in the range of interest for completing robotic tasks such as grasping, pose estimation, and item discovery.

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“…The finite element method (FEM) is one of the numerical methods applied to solve a PDE that represents the physical situation. Many types of realistic problems that are defined by a PDE can only be analyzed with numerical methods, like problems in electromagnetism (Bilican et al 2016), fluid mechanics (Su et al 2019), Micro-Electro-Mechanical-Systems (MEMS) (Kumar et al 2019;Thalluri et al 2020), acoustics (Rahnama 2020), optics (Hah 2018), solid mechanics (Wang et al 2018;Azeman et al 2019), and heat transfer (Dhara and Singh 2020). The analytical solution becomes impossible to determine when all the effects of the problem are considered, and that makes a numerical solution the sole method to be employed.…”

Section: Introductionmentioning

confidence: 99%

Definition and detection of simulation noise via imaginary simulated particles in comparison with an electrical microfluidic chip noise

Güler

2020

Microsyst Technol

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Real problems in science and engineering generally do not have an analytical solution, which invariably leads to the application of numerical methods to analyze the problem. The numerical solutions to the same problem give different results due to variations in discretization, which are defined as simulation noise in this study. Microfluidics impedance flow cytometry is employed to demonstrate and compare experimental and simulated noise. For measurement of the simulation noise, an object is assigned with the same electrical parameters as the medium and moved along the electrode region through a microchannel. Since the object is no different to the medium in terms of material properties, forwarding of the object through the electrodes doesn't have any physical effect, but just reorders the meshing. However, the impedance, which is the calculated output parameter of the simulation, fluctuates due to the reordering of the meshes and is defined as the simulation noise. By employing the imaginary object method, noise can be measured for every Finite element method (FEM) simulation even if the problem has a different physical background.

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Passive tactile sensor for measuring elastic modulus of soft material: Continuum-mechanics model and experiment

Cited by 5 publications

References 27 publications

Ultrathin Tactile Sensors with Directional Sensitivity and a High Spatial Resolution

Ultrathin Tactile Sensors with Directional Sensitivity and a High Spatial Resolution

Direct Shear Stress Mapping Using a Gallium Nitride LED-Based Tactile Sensor

Definition and detection of simulation noise via imaginary simulated particles in comparison with an electrical microfluidic chip noise

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