Acoustic Sensor With PVDF Micro-Pillars and Patterned Electrodes

2008 ◽  
Author(s):  
Jian Xu ◽  
Marcelo J. Dapino ◽  
Daniel Gallego Perez ◽  
Derek Hansford
Keyword(s):  
Theoretical Analysis ◽  
Optimization Algorithm ◽  
Polyvinylidene Fluoride ◽  
Dynamic Range ◽  
Acoustic Sensor ◽  
Frequency Bandwidth ◽  
Electrical Parameters ◽  
New Type ◽  
Patterned Electrodes ◽  
Micro Pillars

This paper addresses the design and theoretical analysis of a new type of millimeter-size acoustic sensor that uses Polyvinylidene Fluoride (PVDF) micro-pillars and patterned electrodes. The sensor has the potential to achieve 100x the sensitivity of existing commercial sensors in combination with a dynamic range of 181dB and a frequency bandwidth of at least 100 kHz. A constrained optimization algorithm has been developed as a function of geometric parameters (sensor footprint, diameter and height of the micro-pillars, gap between pillar edges, number of pillars) and electrical parameters of the sensor and conditioning amplifier.

Validation and Characterization of an Acoustic Sensor Based on PVDF Micropillars and Patterned Electrodes

2010 ◽  
Author(s):  
Jian Xu ◽  
Marcelo J. Dapino ◽  
Daniel Gallego-Perez ◽  
Derek Hansford
Keyword(s):  
Acoustic Waves ◽  
Polyvinylidene Fluoride ◽  
Notch Filter ◽  
Design Principles ◽  
Pvdf Film ◽  
Acoustic Sensor ◽  
Gap Ratio ◽  
Patterned Electrodes ◽  
The Individual

This paper addresses the fabrication, validation, and characterization of a millimeter-size acoustic sensor consisting of Polyvinylidene Fluoride (PVDF) micropillars and patterned electrodes. The sensor takes advantage of two key design principles: stress amplification through the area ratio between the overall surface exposed to acoustic waves and the area of the individual micropillars, and patterned electrodes which reduce the capacitance of the sensor by excluding the capacitance of the air between micropillars. In combination, these design principles enable a sensor capable of achieving 100× the sensitivity of flat PVDF film. A sensitivity analysis is presented and sensor fabrication details are described. An experimental setup was developed to characterize the sensor against a reference microphone. A signal conditioning circuit including a preamplifier circuit and a notch filter was designed and constructed. Sensitivity calibration tests show that a micropillar array with a gap ratio of 5.82 exhibits a stress constant g33 = −19.93 V/m/Pa, which is 60.39 times greater than the stress constant of commercial PVDF film. Experimental results also show that the sensitivity of the sensor is in close agreement with theory, thus confirming the performance advantages of the micropillar sensor.

scholarly journals Microphone based on Polyvinylidene Fluoride (PVDF) micro-pillars and patterned electrodes

2009 ◽  
Vol 153 (1) ◽  
pp. 24-32 ◽  
Author(s):  
J. Xu ◽  
M.J. Dapino ◽  
D. Gallego-Perez ◽  
D. Hansford
Keyword(s):  
Polyvinylidene Fluoride ◽  
Patterned Electrodes ◽  
Micro Pillars

scholarly journals Design and Simulation of Flexible Underwater Acoustic Sensor Based on 3D Buckling Structure

Micromachines ◽  
2021 ◽  
Vol 12 (12) ◽  
pp. 1536
Author(s):  
Guochang Liu ◽  
Wenping Cao ◽  
Guojun Zhang ◽  
Zhihao Wang ◽  
Haoyu Tan ◽  
...  
Keyword(s):  
Flexible Substrate ◽  
Structured Data ◽  
Comsol Multiphysics ◽  
Marine Resources ◽  
Acoustic Sensor ◽  
Frequency Bandwidth ◽  
Underwater Robots ◽  
Vector Hydrophone ◽  
New Type ◽  
Marine Exploration

The exploration of marine resources has become an essential part of the development of marine strategies of various countries. MEMS vector hydrophone has great application value in the exploration of marine resources. However, existing MEMS vector hydrophones have a narrow frequency bandwidth and are based on rigid substrates, which are not easy to be bent in the array of underwater robots. This paper introduces a new type of flexible buckling crossbeam–cilium flexible MEMS vector hydrophone, arranged on a curved surface by a flexible substrate. A hydrophone model in the fluid domain was established by COMSOL Multiphysics software. A flexible hydrophone with a bandwidth of 20~4992 Hz, a sensitivity of −193.7 dB, excellent “8” character directivity, and a depth of concave point of 41.5 dB was obtained through structured data optimization. This study plays a guiding role in the manufacture and application of flexible hydrophones and sheds light on a new way of marine exploration.

Development of imaging plate for a TEM and its characteristics

1989 ◽  
Vol 47 ◽  
pp. 100-101
Author(s):  
N. Mori ◽  
T. Oikawa ◽  
Y. Harada ◽  
J. Miyahara ◽  
T. Matsuo
Keyword(s):  
Dynamic Range ◽  
Protective Layer ◽  
High Sensitivity ◽  
Imaging Plate ◽  
Phosphor Layer ◽  
Imaging Device ◽  
X Ray Imaging ◽  
New Type ◽  
Basic Characteristics ◽  
Reading System

The Imaging Plate (IP) is a new type imaging device, which was developed for diagnostic x ray imaging. We have reported that usage of the IP for a TEM has many merits; those are high sensitivity, wide dynamic range, and good linearity. However in the previous report the reading system was prototype drum-type-scanner, and IP was also experimentally made, which phosphor layer was 50μm thick with no protective layer. So special care was needed to handle them, and they were used only to make sure the basic characteristics. In this article we report the result of newly developed reading, printing system and high resolution IP for practical use. We mainly discuss the characteristics of the IP here. (Precise performance concerned with the reader and other system are reported in the other article.)Fig.1 shows the schematic cross section of the IP. The IP consists of three parts; protective layer, phosphor layer and support.

A Flextensional Transducer Prototype with PVDF Piezoelectric Film

2014 ◽  
Vol 670-671 ◽  
pp. 1153-1158
Author(s):  
Jing Jing Liu ◽  
Lei Qin ◽  
Li Kun Wang ◽  
Chao Zhong ◽  
Bin Zhang ◽  
...  
Keyword(s):  
Polyvinylidene Fluoride ◽  
Laser Scanning ◽  
Longitudinal Vibration ◽  
Voltage Response ◽  
Acoustic Measurement ◽  
Piezoelectric Film ◽  
Radial Vibration ◽  
Frequency Bandwidth ◽  
Metallic Shell ◽  
Flextensional Transducer

This paper presents a prototype of a new flextensional transducer with PVDF (Polyvinylidene Fluoride) piezoelectric film instead of metallic shell. Resonance frequency, bandwidth, transmitting voltage response, and horizontal directivity of the flextensional transducer with PVDF piezoelectric film were respectively measured by using laser-scanning vibrometer, and underwater acoustic measurement system. Experimental results showed that the new transducer features effectively conversion from longitudinal vibration of piezoelectric stack into radial vibration of PVDF piezoelectric film.

The theoretical analysis and simulation of acoustic absorber for nonlinear shunted loudspeaker

2021 ◽  
Vol 263 (6) ◽  
pp. 388-393
Author(s):  
Wenjiang Wang ◽  
Xianhui Li ◽  
Junjuan Zhao ◽  
Peng Zhang ◽  
Xinyun Li ◽  
...  
Keyword(s):  
Theoretical Analysis ◽  
Sound Absorption ◽  
Nonlinear Term ◽  
Equivalent Model ◽  
Frequency Bandwidth ◽  
Nonlinear Circuit ◽  
Van Der Pol ◽  
Absorption Bandwidth ◽  
Simulation Results ◽  
Different Time Scales

In this paper, a nonlinear electroacoustic absorber based on a tunable loudspeaker is proposed to broaden its sound absorption bandwidth. The main mechanism is a nonlinear circuit is coupled at loudspeaker's terminal. A series of theoretical analysis and simulation work are carried out in this paper. The equivalent model is composed of a linear term describing the loudspeaker and a nonlinear term of a coupled Duffing-van Der Pol bistable circuit. The invariant manifold method is used to solve different time scales. The analysis and simulation results show that the nonlinear circuit can widen the frequency bandwidth of the structure.

scholarly journals One-chip analog circuits for a new type of plasma wave receiver on board space missions

2017 ◽  
Vol 6 (1) ◽  
pp. 159-167 ◽  
Author(s):  
Takahiro Zushi ◽  
Hirotsugu Kojima ◽  
Hiroshi Yamakawa
Keyword(s):  
Plasma Wave ◽  
Analog Circuits ◽  
Integrated Circuit ◽  
Dynamic Range ◽  
Test System ◽  
Analog To Digital ◽  
Application Specific Integrated Circuit ◽  
New Type ◽  
Narrow Dynamic Range ◽  
Asic Chip

Abstract. Plasma waves are important observational targets for scientific missions investigating space plasma phenomena. Conventional fast Fourier transform (FFT)-based spectrum plasma wave receivers have the disadvantages of a large size and a narrow dynamic range. This paper proposes a new type of FFT-based spectrum plasma wave receiver that overcomes the disadvantages of conventional receivers. The receiver measures and calculates the whole spectrum by dividing the observation frequency range into three bands: bands 1, 2, and 3, which span 1 Hz to 1 kHz, 1 to 10 kHz, and 10 to 100 kHz, respectively. To reduce the size of the receiver, its analog section was realized using application-specific integrated circuit (ASIC) technology, and an ASIC chip was successfully developed. The dimensions of the analog circuits were 4.21 mm  ×  1.16 mm. To confirm the performance of the ASIC, a test system for the receiver was developed using the ASIC, an analog-to-digital converter, and a personal computer. The frequency resolutions for bands 1, 2, and 3 were 3.2, 32, and 320 Hz, respectively, and the average time resolution was 384 ms. These frequency and time resolutions are superior to those of conventional FFT-based receivers.

scholarly journals Molecular Simulation and Theoretical Analysis of Slide-Ring Gels under Biaxial Deformation

Gels ◽  
2021 ◽  
Vol 7 (3) ◽  
pp. 129
Author(s):  
Kotaro Tanahashi ◽  
Tsuyoshi Koga
Keyword(s):  
Theoretical Analysis ◽  
Molecular Mechanism ◽  
Elastic Properties ◽  
Mechanical Characteristics ◽  
Slip Model ◽  
Biaxial Deformation ◽  
New Type ◽  
Cross Links ◽  
Nonlinear Stretching ◽  
Stretching Effect

Slide-ring (SR) gels, a new type of gels that have cross-links moving along the chains, are known to have unique mechanical characteristics. In the case of biaxial deformations, it has been experimentally shown that the stress–strain (S–S) relationships of SR gels can be well described by the neo-Hookean (NH) model. This behavior is quite different from that of conventional chemical gels, where the S–S curves deviate from the NH model. To understand the molecular mechanism of such peculiar elastic properties of SR gels, we studied the effects of movable cross-links by using molecular simulations and theoretical analysis. We calculate the S–S relationships in biaxial deformation for two types of models: slip model, where the cross-links can slide along chains representing SR gels, and non-slip model, which corresponds to conventional chemical gels. In the theoretical analysis, we calculate the S–S relationships by using the models with the Gaussian and the Langevin chains to investigate the nonlinear stretching effect of the chain in the slip and non-slip models. As a result, we found that the peculiar elastic behaviors of SR gels in biaxial deformations are well explained by the effect of movable cross-links suppressing the nonlinear stretching of the chain.

scholarly journals Dynamic Range Analysis of the Phase Generated Carrier Demodulation Technique

2014 ◽  
Vol 2014 ◽  
pp. 1-5 ◽  
Author(s):  
M. J. Plotnikov ◽  
A. V. Kulikov ◽  
V. E. Strigalev ◽  
I. K. Meshkovsky
Keyword(s):  
Theoretical Analysis ◽  
Dynamic Range ◽  
Range Analysis ◽  
Upper Limit ◽  
Low Pass ◽  
Nonlinear Character ◽  
Simulation Results ◽  
Low Pass Filters ◽  
First Time ◽  
Phase Generated Carrier

The dependence of the dynamic range of the phase generated carrier (PGC) technique on low-pass filters passbands is investigated using a simulation model. A nonlinear character of this dependence, which could lead to dynamic range limitations or measurement uncertainty, is presented for the first time. A detailed theoretical analysis is provided to verify the simulation results and these results are consistent with performed calculations. The method for the calculation of low-pass filters passbands according to the required dynamic range upper limit is proposed.

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