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Bimorph

About: Bimorph is a research topic. Over the lifetime, 3339 publications have been published within this topic receiving 51880 citations.


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Journal ArticleDOI
TL;DR: In this article, a single-crystal silicon (SCS)-based micromirror that is electrothermally actuated by a platinum heater integrated at the end of a thermal bimorph actuator is presented.
Abstract: We report a single-crystal silicon (SCS)-based micromirror that is electrothermally actuated by a platinum heater integrated at the end of a thermal bimorph actuator. The mirror size is 1 mm times1 mm. A large rotation angle of 124 deg has been obtained at a dc voltage of 12.5 V. The resonant frequency of the device is 336 Hz. The radius of curvature of the mirror plate is 130 mm. A lumped circuit model has been developed for electrothermomechanical behavioral simulation and design optimization. The simulation results by the circuit model match the experimental data to within 6.9%

23 citations

Journal ArticleDOI
TL;DR: In this article, the authors studied the three-dimensional electromechanical responses of a piezoelectric bimorph and showed that a 3D solution of the problem can be readily constructed provided the solution to a set of two-dimensional equations very similar to those in the classic plate theory is obtainable.
Abstract: Three-dimensional electromechanical responses of a piezoelectric bimorph are studied. The bimorph is antiparallel in the sense that it consists of two identical, plate-like piezoelectric elements with opposite poling directions. Both the top and bottom surfaces of the bimorph are fully covered with negligibly thin conductive electrodes. By introducing a small parameter and using the transfer matrix method it is shown that a three-dimensional solution of the problem can be readily constructed, provided the solution to a set of two-dimensional equations very similar to those in the classic plate theory is obtainable. The three-dimensional solution satisfies all the field equations as well as the boundary conditions on the major surfaces and at the interface between the two piezoelectric plates. In many special cases, the electric edge condition can be fulfilled point by point, and thus the solution is exact in Saint-Venant's sense. The formulation and new analytical results for a strip-shaped cantilever bimorph under the action of applied voltage and end moment are presented.

23 citations

Journal ArticleDOI
TL;DR: In this paper, a U-shaped bimorph actuator is constructed by cutting out the middle part of the composite/aluminum laminates, where the MWCNT-aligned direction is parallel to the length direction of the U-shape actuators, and the bending displacement and force output are modeled by combining strength-of-materials theories and rule of mixtures.
Abstract: By using aligned multi-walled carbon nanotube (MWCNT) reinforced epoxy composites possessing a negative coefficient of thermal expansion (CTE) as well as high Young’s modulus and aluminum foils, novel electrothermal bimorph actuators are fabricated. U-shaped bimorph actuators are formed by cutting out the middle part of the composite/aluminum laminates, where the MWCNT-aligned direction is parallel to the length direction of the U-shaped bimorph actuators. We demonstrate that the bimorph actuators with a free length of 16 mm show a large bending displacement and force output, and their values are 7.6–10.0 mm and 0.8–7.8 mN under a DC voltage of 5.2–6.0 V. Based on these results, the bending displacement and force output of the bimorph actuator are modeled by combining strength-of-materials theories and rule of mixtures (Voigt model and Turner’s model). By using these models, we indicate contributions from two sources toward the increased bending displacement and force output in the bimorph actuator: (i) designing the Young’s modulus and negative CTE of the composite layer by controlling the MWCNT volume fraction and the dimensional parameters (especially thickness) of the bimorph actuator; (ii) selecting materials having a high Young’s modulus as well as a large CTE as the second layer.

23 citations

Journal ArticleDOI
TL;DR: This work discusses the concept of lightweight segmented bimorph mirrors for adaptive optics and focuses on technological aspects of the segment design that are critical for space applications and describes a single segment demonstrator.
Abstract: We discuss the concept of lightweight segmented bimorph mirrors for adaptive optics. The segment consists of a monocrystal silicon substrate actuated by an array of in-plane piezoceramic (PZT) actuators with honeycomb electrodes. We focus on technological aspects of the segment design that are critical for space applications and describe a single segment demonstrator. The morphing capability of the segment is evaluated experimentally. We also discuss the local deformations (dimples) associated with the shape of the electrodes acting on the PZT array.

23 citations

Journal ArticleDOI
TL;DR: An improved nonoptical shear force detection system based on a rectangular bimorph cantilever incorporating the force feedback technique has been developed for tip-sample distance regulation in shear forces microscopy.
Abstract: An improved nonoptical shear force detection system based on a rectangular bimorph cantilever incorporating the force feedback technique has been developed for tip–sample distance regulation in shear force microscopy. The force feedback amplifier consisting of a phase shifter and a linear amplifier is adjusted in such a way that the motion of the cantilever is mechanically amplified, resulting in a great enhancement of quality factor Q. Driving a fiber attached bimorph cantilever at its first harmonic resonance, with a phase shift φ=π/2 and an appropriate amplifier gain, allows one to obtain a Q factor greater than 103 in air, which corresponds to a Q enhancement of more than 1 order of magnitude. The effect of Q enhancement leads to an increase in the signal to noise ratio and thus the force detection sensitivity of the system. Typically, the minimum interaction force that can be sensed by the system is about 2 pN/√Hz. Topographic images of a human aorta tissue section in its natural state, taken with th...

23 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202358
2022116
202191
202090
2019123
2018117