Topics

Air-coupled ultrasonic ferroelectret receiver with additional bias voltage.

08:00 EDT 28th June 2019 | BioPortfolio

Summary of "Air-coupled ultrasonic ferroelectret receiver with additional bias voltage."

High sensitivity is an important requirement for air-coupled ultrasonic sensors applied to materials testing. With a lower acoustic impedance than any piezoelectric material, charged cellular polypropylene (PP) offers better matching to air with a similar piezoelectric coefficient. The piezoelectric properties of charged cellular PP originate from their polarization, creating permanent internal voltage. The sensitivity of the sensor can be increased by applying additional DC bias voltage, as it has been done already for transmitters. This work presents the first ultrasonic sensor based on charged cellular PP including a high-voltage module providing DC bias voltage up to 2 kV. This bias voltage led to an increase of the signal-to-noise ratio of up to 15±1 dB. The measurement of the received signal depending on the applied bias voltage is proposed as a new method of determining the internal voltage of ferroelectrets. The sensor combined with a cellular PP transmitter was applied to non-destructive testing of a rotor blade segment and glued laminated timber, enabling imaging of the internal structure of these specimens with a thickness around 4 cm.

Affiliation

Journal Details

This article was published in the following journal.

Name: IEEE transactions on ultrasonics, ferroelectrics, and frequency control
ISSN: 1525-8955
Pages:

Links

DeepDyve research library

PubMed Articles [8476 Associated PubMed Articles listed on BioPortfolio]

Nonlinear Behavior of Electrostatically Actuated Microbeams with Coupled Longitudinal⁻Transversal Vibration.

Microelectromechanical switch has become an essential component in a wide variety of applications, ranging from biomechanics and aerospace engineering to consumer electronics. Electrostatically actuat...

High-SPL Air-coupled Piezoelectric Micromachined Ultrasonic Transducers based on 36% ScAlN Thin-film.

Air-coupled piezoelectric micromachined ultrasonic transducers (PMUTs) using 36% Scandium-doped aluminum nitride (ScAlN) thin-film are presented in this paper. ScAlN is known to exhibit higher piezoel...

APD optimal bias voltage compensation method based on machine learning.

The signal-to-noise ratio (SNR) of avalanche photodiode (APD) in optical detection system is greatly influenced by background radiation and operating temperature, so an APD optimal bias voltage compen...

Development of a robust ultrasonic-based sample treatment to unravel the proteome of OCT-embedded solid tumor biopsies.

An effective three step proteomic workflow is proposed to overcome the pitfalls caused by polymers present in OCT-embedded tissue during preparation for mass spectrometry analysis. First, the OCT-embe...

Bias-Voltage Driven Switching of the Charge-Density-Wave and Normal Metallic Phases in 1T-TaS Thin-Film Devices.

We report on switching among three charge-density-wave phases - commensurate, nearly commensurate, incommensurate - and the high-temperature normal metallic phase in thin-film 1T-TaS devices induced b...

Clinical Trials [2574 Associated Clinical Trials listed on BioPortfolio]

Does VoltagE Guided Additional Ablation Improve Procedural Outcome of Atrial Fibrillation Ablation?

This study is designed to investigate whether pulmonary vein isolation(PVI) plus stepwise additional ablation approach based on the degree of low voltage area versus PVI only can improve p...

PVI Alone Versus Additional Low-voltage Substrate Modification During SR Guiding by Contact-force Catheter in Older Patients With Paroxysmal AF

The primary objective of this investigation is to compare the efficacy of two different AF ablation strategies in older patients with paroxysmal AF: Pulmonary vein isolation alone versus a...

Low-voltage Areas Defragmentation in Sinus Rhythm for Radiofrequency Ablation of Persistent Atrial Fibrillation

This is a study evaluating the value of defragmentation of sinus rhythmic low voltage areas in addition to isolation of pulmonary veins in the removal of recurrent atrial fibrillation. The...

Effect of Passive Ultrasonic Irrigation on the Reduction of Bacteria and Endotoxins in Root Canals

The purpose of this clinical study was to compare the effectiveness of passive ultrasonic irrigation with that of traditional syringe irrigation on the removal of bacteria and endotoxin (l...

Efficacy of Cognitive Bias Modification in Residential Treatment for Addiction

The purpose of this study is to determine whether computer bias modification for interpretation bias (CBM-I) is effective in the reduction of suicidal ideation in substance use disorders.

Medical and Biotech [MESH] Definitions

Any deviation of results or inferences from the truth, or processes leading to such deviation. Bias can result from several sources: one-sided or systematic variations in measurement from the true value (systematic error); flaws in study design; deviation of inferences, interpretations, or analyses based on flawed data or data collection; etc. There is no sense of prejudice or subjectivity implied in the assessment of bias under these conditions.

Any deviation of results or inferences from the truth, or processes leading to such deviation. Bias can result from several sources: one-sided or systematic variations in measurement from the true value (systematic error); flaws in study design; deviation of inferences, interpretations, or analyses based on flawed data or data collection; etc. There is no sense of prejudice or subjectivity implied in the assessment of bias under these conditions.

Adverse of favorable selection bias exhibited by insurers or enrollees resulting in disproportionate enrollment of certain groups of people.

The influence of study results on the chances of publication and the tendency of investigators, reviewers, and editors to submit or accept manuscripts for publication based on the direction or strength of the study findings. Publication bias has an impact on the interpretation of clinical trials and meta-analyses. Bias can be minimized by insistence by editors on high-quality research, thorough literature reviews, acknowledgement of conflicts of interest, modification of peer review practices, etc.

The introduction of error due to systematic differences in the characteristics between those selected and those not selected for a given study. In sampling bias, error is the result of failure to ensure that all members of the reference population have a known chance of selection in the sample.

Quick Search


DeepDyve research library

Searches Linking to this Article