Acoustic velocity measurement by means of Laser Doppler Velocimetry: Development of an Extended Kalman Filter and validation in free-field measurement

Duff, Alain Le; Plantier, Guy; Valière, Jean-Christophe; Gazengel, Bruno

doi:10.1016/j.ymssp.2015.08.020

Cited by 7 publications

(2 citation statements)

References 32 publications

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“…To first provide a foundation for this experimental setup and validate that a relationship can be measured due to the acoustic impedance mismatch between air and the base material, the velocity at the surface of the base material was measured using a laser vibrometer (Polytec PDV-100), which has previously been used to estimate the acoustic velocity of different materials. 55 The setup is shown schematically in Figure S8a. The root-mean-square (RMS) voltage from the vibrometer was measured over a 5 s time window as the speaker excited the base material with white noise.…”

Section: ■ Materials and Methodsmentioning

confidence: 99%

Electrostatic Acoustic Sensor with an Impedance-Matched Diaphragm Characterized for Body Sound Monitoring

Rennoll

McLane

Eisape

et al. 2023

ACS Appl. Bio Mater.

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Acoustic sensors are able to capture more incident energy if their acoustic impedance closely matches the acoustic impedance of the medium being probed, such as skin or wood. Controlling the acoustic impedance of polymers can be achieved by selecting materials with appropriate densities and stiffnesses as well as adding ceramic nanoparticles. This study follows a statistical methodology to examine the impact of polymer type and nanoparticle addition on the fabrication of acoustic sensors with desired acoustic impedances in the range of 1−2.2 MRayls. The proposed method using a design of experiments approach measures sensors with diaphragms of varying impedances when excited with acoustic vibrations traveling through wood, gelatin, and plastic. The sensor diaphragm is subsequently optimized for body sound monitoring, and the sensor's improved body sound coherence and airborne noise rejection are evaluated on an acoustic phantom in simulated noise environments and compared to electronic stethoscopes with onboard noise cancellation. The impedance-matched sensor demonstrates high sensitivity to body sounds, low sensitivity to airborne sound, a frequency response comparable to two state-of-the-art electronic stethoscopes, and the ability to capture lung and heart sounds from a real subject. Due to its small size, use of flexible materials, and rejection of airborne noise, the sensor provides an improved solution for wearable body sound monitoring, as well as sensing from other mediums with acoustic impedances in the range of 1−2.2 MRayls, such as water and wood.

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Section: ■ Materials and Methodsmentioning

confidence: 99%

Electrostatic Acoustic Sensor with an Impedance-Matched Diaphragm Characterized for Body Sound Monitoring

Rennoll

McLane

Eisape

et al. 2023

ACS Appl. Bio Mater.

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“…Extending the p-u probe technique with more spatial resolution is one possible method. Laser Doppler Velocimetry (LDV) [107] could be an alternative for hot-wire anemometers. Further, Micro-Stereo Particle Image Velocimetry technique with high-speed cameras could be used to capture acoustic velocity field.…”

Section: Future Prospectsmentioning

confidence: 99%

An Overview of Acoustic Impedance Measurement Techniques and Future Prospects

et al. 2021

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In order to progress in the area of aeroacoustics, experimental measurements are necessary. Not only are they required for engineering applications in acoustics and noise engineering, but also they are necessary for developing models of acoustic phenomenon around us. One measurement of particular importance is acoustic impedance. Acoustic Impedance is the measure of opposition of acoustical flow due to the acoustic pressure. It indicates how much sound pressure is generated by the vibration of molecules of a particular acoustic medium at a given frequency and can be a characteristic of the medium.The aim of the present paper is to give a synthetic overview of the literature on impedance measurements and to discuss the advantage and disadvantage of each measurement technique. In this work, we investigate the three main categories of impedance measurement techniques, namely reverberation chamber techniques, impedance tube techniques, and far-field techniques. Theoretical principles for each technique are provided along with a discussion on historical development and recent advancements for each technique.

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Estimation of tire-road friction coefficient based on combined APF-IEKF and iteration algorithm

Liu

Yang

et al. 2017

Mechanical Systems and Signal Processing

114

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Acoustic velocity measurement by means of Laser Doppler Velocimetry: Development of an Extended Kalman Filter and validation in free-field measurement

Cited by 7 publications

References 32 publications

Electrostatic Acoustic Sensor with an Impedance-Matched Diaphragm Characterized for Body Sound Monitoring

Electrostatic Acoustic Sensor with an Impedance-Matched Diaphragm Characterized for Body Sound Monitoring

An Overview of Acoustic Impedance Measurement Techniques and Future Prospects

Estimation of tire-road friction coefficient based on combined APF-IEKF and iteration algorithm

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