Dr. Leon M. Headings Profile

Dr. Leon M. Headings

at Ohio State Univ

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Author

Publications (8)

Proceedings Article | 25 April 2023 Presentation + Paper

Characterization of a PVDF sensor embedded in a metal structure using ultrasonic additive manufacturing

Mohid Khattak, Leon Headings, Marcelo Dapino

Proceedings Volume 12489, 124890F (2023) https://doi.org/10.1117/12.2659270

KEYWORDS: Sensors, Ferroelectric polymers, Metals, Aluminum, Ultrasonics, Matrices, Additive manufacturing, Structural health monitoring, Manufacturing, Vibration

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Proceedings Article | 18 April 2022 Presentation + Paper

Flexible piezo-capacitive pressure sensor for measurement of wind speed and direction

Arun Ramanathan, Leon Headings, Marcelo Dapino

Proceedings Volume 12046, 1204607 (2022) https://doi.org/10.1117/12.2614329

KEYWORDS: Sensors, Wind measurement, Capacitance, Electrodes, Capacitors, Ferroelectric polymers, Dielectrics, Protactinium, Temperature metrology, Magnetometers

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Proceedings Article | 22 March 2021 Presentation

Metal-matrix composites embedded with piezoelectric PVDF sensors using ultrasonic additive manufacturing

Arun Kumar Ramanathan, M. Bryant Gingerich, Leon Headings, Marcelo Dapino

Proceedings Volume 11594, 115940A (2021) https://doi.org/10.1117/12.2581845

KEYWORDS: Sensors, Ferroelectric polymers, Ultrasonics, Composites, Additive manufacturing, Smart materials, Metals, Energy harvesting, Thermal sensing, Solid state electronics

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Metal-matrix composites with active components have been investigated as a way to functionalize metals. As opposed to surface-mounted approaches, smart materials embedded in metals can be effectively shielded against the environment while providing in-situ sensing, health monitoring, actuation, or energy harvesting functions. Typical manufacturing approaches can be problematic, however, in that they may physically damage the smart material or degrade its electromechanical properties. For instance, non-resin-based embedment procedures such as powder metallurgy involve isostatic compression and diffusion bonding, leading to high process temperatures and breakdown of the electromechanical properties of the active component to be embedded. This paper presents the development and characterization of an aluminum-matrix composite embedded with piezoelectric polyvinylidene fluoride (PVDF) sensors using ultrasonic additive manufacturing (UAM). UAM incorporates the principles of solid-state, ultrasonic metal welding and subtractive processes to fabricate metal-matrices with seamlessly embedded smart materials and without thermal loading. As implemented in this study, the UAM process uses as-received, commercial Al 6061 tape foilstock and TE Connectivity PVDF film. In order to increase the mechanical coupling between the sensor and the metal-matrix without the aid of adhesives, the PVDF sensor is embedded with an empirically optimized pre-compression defined by the tape foils welded above the sensor. The specimen is characterized by tensile (d31 mode), bending (d31 mode), and compression tests (d33 mode) to evaluate its functional performance. Within the investigated load range, the specimen exhibits open-circuit sensitivities of 4.6 mV/N under uniaxial tension and 9.7 mV/N under compressive impulse tests with better than 95% linearity and frequency bandwidth of several kilohertz. The technology presented in this study could be applied for load and tactile sensing, impact detection and localization, thermal measurements, energy harvesting, and non-destructive testing applications.

Proceedings Article | 20 May 2020 Presentation + Paper

Preliminary investigation of a differential pressure sensor using flexible piezoelectrics with pyroelectric compensation

Arun K. Ramanathan, Leon Headings, Marcelo Dapino

Proceedings Volume 11382, 113820I (2020) https://doi.org/10.1117/12.2558725

KEYWORDS: Sensors, Ferroelectric polymers, Amplifiers, Temperature metrology, Wind measurement, Aerodynamics, Fused deposition modeling, Polymers, Electrodes

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Proceedings Article | 18 March 2019 Presentation + Paper

Design optimization of flexible piezoelectric PVDF unimorphs for surface pressure transducer applications

Arun K. Ramanathan, Leon Headings, Marcelo Dapino

Proceedings Volume 10973, 1097307 (2019) https://doi.org/10.1117/12.2514371

KEYWORDS: Ferroelectric polymers, Sensors, Electrodes, Finite element methods, Transducers, Polymers

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Proceedings Article | 27 March 2018 Presentation + Paper

Near DC force measurement using PVDF sensors

Arun Kumar Ramanathan, Leon Headings, Marcelo Dapino

Proceedings Volume 10602, 106020M (2018) https://doi.org/10.1117/12.2296849

KEYWORDS: Ferroelectric polymers, Sensors, Amplifiers, Capacitance, Resistance, Resonators, Capacitors

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Proceedings Article | 1 April 2009 Paper

Thermoelectric power generation for hybrid-electric vehicle auxiliary power

Leon Headings, Gregory Washington, Shawn Midlam-Mohler, Joseph Heremans

Proceedings Volume 7290, 72900E (2009) https://doi.org/10.1117/12.816212

KEYWORDS: Thermoelectric materials, Combustion, Prototyping, Resistance, Thermal effects, Temperature metrology, Energy efficiency, Bismuth, Sensors, Solid state electronics

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Proceedings Article | 27 March 2008 Paper

Thermoelectrics as elements of hybrid-electric vehicle thermal energy systems

Leon Headings, Gregory Washington, Christopher Jaworski

Proceedings Volume 6930, 69300C (2008) https://doi.org/10.1117/12.776703

KEYWORDS: Thermoelectric materials, Liquids, Resistance, Combustion, Thermal effects, Bismuth, Gases, Systems modeling, Temperature metrology, Energy efficiency

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Showing 5 of 8 publications

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