Topic
Piezoelectric sensor
About: Piezoelectric sensor is a research topic. Over the lifetime, 7127 publications have been published within this topic receiving 115903 citations.
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TL;DR: In this article, the authors developed a dynamic model for a disk, PZT patch connected to a structure by means of a thin adhesive layer and found that the effect of the adhesive layer is frequency dependent and that the losses due to the shear deformation of the adhesives were considerably lower than for the quasi-static case.
Abstract: Piezoelectric (PZT) transducers are commonly used for numerous diagnostic techniques for nondestructive evaluation (NDE) of structures Researchers in the past have shown that the presence of an adhesive layer between the PZT patch and the structure could have a significant impact both on the amplitude of the wave propagated into the structure and on its Electromechanical impedance (EMI) signature To account for losses, models have been developed to describe the effects of the adhesive layer Nonetheless, the models found in the literature are strictly valid for either 1D or rectangular PZT patches only The aim of this article is to develop a dynamic model for a disk, PZT patch connected to a structure by means of a thin adhesive layer Unlike previous works, it was found that for disk-shape sensors the effect of the adhesive layer is frequency dependent and that the losses due to the shear deformation of the adhesive layer for the case near the first radial resonant mode were considerably lower than for the quasi-static case In order to validate the model developed in this article, experimental data are compared to the predicted EMI signatures of disk-shape sensors mounted on a structure for various configurations
34 citations
TL;DR: In this paper, the authors describe the electrical optimization of continuous wave power delivery through thick steel barriers using ultrasound using wave propagation theory to properly analyze the system and evaluate the power transfer efficiencies.
Abstract: In many commercial, industrial, and military applications, supplying power to electronics through a thick metallic
barrier without compromising its structural integrity would provide tremendous advantages over many existing
barrier-penetrating techniques. The Faraday shielding presented by thick metallic barriers prevents the use of
electromagnetic power-transmission techniques. This work describes the electrical optimization of continuouswave
power delivery through thick steel barriers using ultrasound. Ultrasonic channels are formed by attaching
pairs of coaxially-aligned piezoelectric transducers to opposite sides of thick steel blocks. The thickness of the steel
considered is on the order of, or greater than, one quarter wavelength of the acoustic power signal inside of steel,
requiring the use of wave propagation theory to properly analyze the system. A characterization and optimization
methodology is presented which measures the linear two-port electrical scattering parameters of the transducersteel-
transducer channel. Using these measurements, the simultaneous conjugate impedance-matching conditions
at both transducers are calculated, and electrical matching-networks are designed to optimize the power transfer
from a 50Ω power amplifier on one side of the steel block to a 50Ω load on the opposite side. In addition, the
impacts of, and interactions between, transducer and steel geometries are discussed, and some general guidelines
for selecting their relationships are presented. Measurements of optimized systems using transducers designed
to resonate at 1 MHz with diameters from 12.7 mm to 66.7 mm, and steel block thicknesses from 9.5 mm to
63.5 mm, reveal power transfer efficiencies as high as 55%, and linear delivery of 81 watts through an optimized
channel.
34 citations
TL;DR: In this article, a coupled linear layerwise laminate theory and a beam FE were formulated for analyzing delaminated composite beams with piezoactuators and sensors, where the model assumed zig-zag fields for the axial displacements and the electric potential and treated the discontinuities in the displacement fields due to the delaminations as additional degrees of freedom.
34 citations
TL;DR: In this paper, the authors provide a comprehensive theoretical study of the dynamic coupling between a surface piezoelectric sensor and an elastic half-plane, focusing on the transformation of mechanical deformation into electric signals under dynamic loads.
Abstract: Surface-bonded piezoelectric sensors can be used to monitor the mechanical behavior of structures for damage detection. This article provides a comprehensive theoretical study of the dynamic coupling between a surface piezoelectric sensor and an elastic half-plane. Attention is focused on the transformation of mechanical deformation into electric signals under dynamic loads. The effect of the longitudinal stiffness of the sensor is included in the developed sensor model. The problem is then formulated by using Fourier transform and solving the resulting integral equations in terms of the interfacial stress. The accuracy of the developed sensor model is evaluated by comparing with results from the finite element analysis. Numerical simulation is conducted to study the relation between the sensor response and the deformation of the host medium under static and dynamic loads. The results indicate the significant effects of the geometry of the sensor, the material mismatch of the system, and the loading frequency upon the sensor response.
34 citations
28 May 1997
TL;DR: In this article, a two-pole coupled resonator was proposed for the detection of physical, chemical, and biochemical measurands, which is applicable to both gaseous and liquid phase measurements.
Abstract: A novel monolithic piezoelectric sensor (MPS) is presented for the detection of physical, chemical and biochemical measurands. This new sensor overcomes specific deficiencies associated with the quartz crystal microbalance (QCM) while still employing a well-characterized, temperature-stable thickness-shear mode (TSM). The sensor is applicable to both gaseous and liquid phase measurements; however, the principal benefit of the MPS is in liquid phase measurements. In these applications, it offers the ability to operate simple, yet stable, oscillator circuits in relatively viscous media. The proposed sensor structure is based on a two-pole coupled resonator, in which mechanical coupling between the electrical input and output determines the electrical properties. This structure offers approximately 180/spl deg/ of phase shift over its 3dB bandwidth with nominally 180/spl deg/ of insertion phase at the symmetric resonant frequency and approximately 0/spl deg/ of insertion phase at the antisymmetric resonant frequency. Simple oscillator circuits may be implemented which measure the symmetric frequency (f/sub s/), the antisymmetric frequency (f/sub a/) or the nominal center frequency (f/sub s/). Suitable switching allows combinations of these frequencies to be sequentially measured, expanding the capabilities of the MPS versus the QCM. This novel MPS sensor structure should accelerate the commercialization of piezoelectric sensor technology, particularly in such areas as chemical, biochemical and environmental testing.
34 citations