Coupling rate measurement of a novel multi-actuated piezoelectric device using optical interferometry

• Autor(a) principal: De Assis Andrade Barbosa, Francisco [UNESP]
• Data de Publicação: 2010
• Outros Autores: Takiy, Aline Emy [UNESP], Higuti, Ricardo Tokio [UNESP], Carbonari, Ronny Calixto, Kitano, Cláudio [UNESP], Silva, Emílio Carlos Nelli
• Tipo de documento: Artigo de conferência
• Idioma: eng
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://dx.doi.org/10.1109/INDUSCON.2010.5740065; http://hdl.handle.net/11449/72051
• topic: Aluminum structures; Auto calibration; Coupling rate; Displacement amplitudes; Drive voltage; Dynamic measurement; Finite Element; He-Ne lasers; Maximum displacement; Michelson-type interferometers; Multi-actuated piezoelectric devices; Nano-positioner; Nanometric ranges; Optical interferometry; Optical phase; Piezoceramic; Piezoceramic devices; Resonance frequencies; Software ANSYS; Topology Optimization Method; Triangular waveform; Voltage ranges; Wire electrical discharge machining; Electric discharge machining; Electric discharges; Epoxy resins; Finite element method; Flexible structures; Interferometers; Interferometry; Neon; Optimization; Piezoelectricity; Resins; Resonance; Piezoelectric actuators

The class of piezoelectric actuators considered in this paper consists of a multi-flexible structure actuated by two or more piezoceramic devices that must generate different output displacements and forces at different specified points of the domain and in different directions. The devices were modeled by finite element using the software ANSYS and the topology optimization method. The following XY actuators were build to achieve maximum displacement in the X and Y directions with a minimum crosstalk between them. The actuator prototypes are composed of an aluminum structure, manufactured by using a wire Electrical Discharge Machining, which are bonded to rectangular PZT5A piezoceramic blocks by using epoxy resin. Multi-actuator piezoelectric device displacements can be measured by using optical interferometry, since it allows dynamic measurements in the kHz range, which is of the order of the first resonance frequency of these piezomechanisms. A Michelson-type interferometer, with a He-Ne laser source, is used to measure the displacement amplitudes in nanometric range. A new optical phase demodulation technique is applied, based on the properties of the triangular waveform drive voltage applied to the XY piezoelectric nanopositioner. This is a low-phase-modulation-depth-like technique that allows the rapid interferometer auto-calibration. The measurements were performed at 100 Hz frequency, and revealed that the device is linear voltage range utilized in this work. The ratio between the generated and coupled output displacements and the drive voltages is equal to 10.97 nm/V and 1.76 nm/V, respectively, which corresponds to a 16% coupling rate. © 2010 IEEE.