1. Abstract There are several optical applications in which a mirror or lens requires accurate manipulation, for example in microscanning or focusing optical systems. Typically, such devices are designed on a trial-and-error basis. To improve on this procedure, we apply topology optimization in the design of a piezoelectric micropositioner. The mechanism employs two piezoelectric stack actuator...

Neutralization of external stimuli in dynamic systems has the major role in health, life, and function of the system. Today, dynamic systems are exposed to unpredicted factors. If the factors are not considered, it will lead to irreparable damages in energy consumption and manufacturing systems. Continuous systems such as beams, plates, shells, and panels that have many applications in differen...

We propose an active noise control (ANC) system for reducing periodic noise generated in a high field area such as noise generated from magnetic resonance imaging (MRI) devices (MR noise). The proposed ANC system utilizes optical microphones and piezoelectric loudspeakers, because specific acoustic equipment is required to overcome the high-field problem, and consists of a head-mounted structur...

A numerical method for analyzing a folded or ring cavity is presented. Astigmatic compensated parameters, stability regions, and beam parameters inside the cavity or within the gain medium can be obtained numerically as long as the intracavity beam propagation can be expressed by round-trip matrices, no matter how complicated the cavity is. This method is easy to follow, and the results are acc...

This paper features the modeling and design of a Robust Decentralized Fast Output Sampling (RDFOS) Feedback control technique for the active vibration control of a smart flexible multimodel Euler-Bernoulli cantilever beams for a multivariable (MIMO) case by retaining the first 6 vibratory modes. The beam structure is modeled in state space form using the concept of piezoelectric theory, the Eul...

Piezoelectric materials can be used as mechanisms to transfer mechanical energy, usually ambient vibration into electrical energy that can be stored and used to power other devices. With the recent advances in wireless and MEMS technology, sensors can be placed almost anywhere necessary. Since these devices are wireless it becomes necessary that they have their own power supply. This power supp...

The present work considers the active vibration control of beam like structures with laminated piezoelectric sensor and actuator layers bonded on top and bottom surfaces of the beam. A finite element model based on Euler-Bernoulli beam theory has been developed. The contribution of the piezoelectric sensor and actuator layers on the mass and stiffness of the beam has been considered with modeli...

We report on a novel microfabrication method to fabricate aluminum nitride (AlN) piezoelectric microstructures down to 2 microns size by a surface micromachining process. Highly c-axis oriented AlN thin films are deposited between thin Cr electrodes on polysilicon structural layers by rf reactive sputtering. The top Cr layer is used both as a mask to etch the AlN thin films and as an electrode ...

A two-port silicon carbide single-clamped beam (cantilever) microelectromechanical system (MEMS) resonant device actuated piezoelectrically and sensed piezoelectrically has been designed, fabricated and tested. Lead zirconium titanate (PZT) has been used as active material to implement the piezoelectric actuator and sensor. Piezoelectric electrodes have been placed on the top of the single 3C-S...

Optoacoustic (OA) microscopy using an all-optical system based on the probe beam deflection technique (PBDT) for detection of laser-induced acoustic signals was investigated as an alternative to conventional piezoelectric transducers. PBDT provides a number of advantages for OA microscopy including (i) efficient coupling of laser excitation energy to the samples being imaged through the probing...