Thermo-Mechanically Trained Shape Memory Alloy for Temperature Recording With Visual Readout

Wang, Wei; Zeng, Wenxin; Ruan, Wenjie; Miller, Eric L.; Sonkusale, Sameer

doi:10.1109/lsens.2020.3044294

Cited by 10 publications

(10 citation statements)

References 12 publications

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“…SMAs are metal alloys with intrinsic thermomechanical memory that can monotonically transform from one predefined configuration to another depending on its initial configuration (shape) and the applied temperature profile. Through thermal training, two-way memory effect SMAs can switch between two crystal structures (austenite and detwinned martensite) at well-defined temperatures without any external stress . As the temperature increases, the SMA transforms from a detwinned martensite phase to an austenite phase.…”

Section: Methodsmentioning

confidence: 99%

“…SMAs can achieve reconfigurable shapes by varying the temperature applied to the antenna. This phase changing memory behavior has been utilized in wireless temperature sensors where the antenna shape can record the temperature extrema. − In this article, a new approach is proposed for antenna reconfiguration through thermal programming of the underlying SMA rather than dedicated circuit elements. Temperature change causes the shape of the antenna to change in order to tune the input impedance of the antenna.…”

Section: Introductionmentioning

confidence: 99%

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Tunable Radio Frequency Antenna Based on Phase Change Materials

2023

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In conventional communication systems, dedicated tunable circuit elements are used to realize different functions and achieve performance metrics. For example, tuning the center frequency or the input impedance of an antenna in a radio frequency (RF) system is performed by complex impedance-matching circuits. In this paper, the antenna utilizes the temperature-induced irreversible mechanical deformation of a shape memory alloy (SMA) as a natural way to tune the antenna’s shape and configuration, thereby providing inherent tunability without bulky circuit elements. This paradigm of material programming for impedance tuning of an SMA-based antenna is validated by both numerical simulation and measurements.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Tunable Radio Frequency Antenna Based on Phase Change Materials

2023

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“…Owing to the characteristics of their light weight, compact size and generatable force, the SMA actuators are expected to be alternatives to conventional electronic actuators, electric motors, and pneumatic and hydraulic actuators. Shape-memory alloys can also be utilized as sensors and have been applied to temperature sensors [ 28 , 29 ], magnetic sensors [ 30 , 31 ], and strain sensors [ 32 , 33 ]. Their transformation speed is, however, comparatively slow, since the phase transformation between martensite phase and austenite phase is led by the temperature, which is conducted by giving heat to the material body or radiating heat to the surrounding environment.…”

Section: Introductionmentioning

confidence: 99%

An SMA Transducer for Sensing Tactile Sensation Focusing on Stroking Motion

Oya

Sawada

2023

Materials

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The authors have developed a micro-vibration actuator using filiform SMA wire electrically driven by periodic electric current. While applying the SMA actuators to tactile displays, we discovered a phenomenon that the deformation caused by a given stress to an SMA wire generated a change in the electrical resistance. With this characteristic, the SMA wire works as a micro-force sensor with high sensitivity, while generating micro-vibration. In this paper, the micro-force sensing ability of an SMA transducer is described and discussed. Experiments are conducted by sliding the SMA sensor on the surface of different objects with different speeds, and the sensing ability is evaluated to be related with human tactile sensation.

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“…SMAs are typically metal alloys such as nickel–titanium that change their shape according to the applied temperature and history. At a certain temperature, the SMA can return to its original shape, which is memorized within the material and can be thermo-mechanically trained [ 33 ]. This thermo-mechanical memory of the SMA was used for the realization of a reconfigurable antenna in related work [ 34 ].…”

Section: Introductionmentioning

confidence: 99%

“…However, it did not demonstrate any additional functionality such as sensing or memory. In our prior work, we demonstrated temperature sensing using SMA-based antennas [ 33 , 35 , 36 , 37 , 38 , 39 ] with integrated memory of temperature events in the shape of the SMA. In these works, the SMA antenna irreversibly changes its configuration from parallel to dipole when the temperature rises above the threshold value altering its radiation profile.…”

Section: Introductionmentioning

confidence: 99%

Temperature Sensing Shape Morphing Antenna (ShMoA)

2022

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Devices that can morph their functions on demand provide a rich yet unexplored paradigm for the next generation of electronic devices and sensors. For example, an antenna that can morph its shape can be used to adapt communication to different wireless standards or improve wireless signal reception. We utilize temperature-sensitive shape memory alloys (SMA) to realize a shape morphing antenna (ShMoA). In the designed architecture, multiple conjoined shape memory alloy sections form the antenna. The shape morphing of this antenna is achieved through temperature control. Different temperature threshold levels are used for programming the shape. Besides its conventional use for RF applications, ShMoA can serve as a multi-level temperature sensor, analogous to thermoreceptors in an insect antenna. ShMoA essentially combines the function of temperature sensing, embedded computing for detection of threshold crossings, and radio frequency readout, all in the single construct of a shape-morphing antenna (ShMoA) without the need for any battery or peripheral electronics. The ShMoA can be employed as bio-inspired wireless temperature sensing antennae on mobile robotic flies, insects, drones and other robots. It can also be deployed as programmable antennas for multi-standard wireless communication.

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Thermo-Mechanically Trained Shape Memory Alloy for Temperature Recording With Visual Readout

Cited by 10 publications

References 12 publications

Tunable Radio Frequency Antenna Based on Phase Change Materials

Tunable Radio Frequency Antenna Based on Phase Change Materials

An SMA Transducer for Sensing Tactile Sensation Focusing on Stroking Motion

Temperature Sensing Shape Morphing Antenna (ShMoA)

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