7,953 resources related to Acoustic Measurements
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RWW2020 will be an international conference covering all aspects of radio and wireless. RWW2020's multidisciplinary events will bring together innovations that are happening across the broad wireless spectrum. RWS2020, this conference application, acts as the main conference for the entire RWW of events that includes the following conferences: PAWR2020, SiRF2020, WiSNet2020, and TWiOS2020 (IEEE Topical Conference on RF/microwave Power Amplifiers, IEEE Topical Meeting on Silicon Monolithic Integrated Circuits in RF Systems, IEEE Topical Conference on Wireless Sensors and Sensor Networks, and IEEE Topical Workshop on the Internet of Space IoS, respectively). In addition to traditional podium presentations and poster sessions, tracks for IEEE Distinguished Lectures, Sunday half-day workshops, Monday panels, and a demo session are planned. A RWW2020 plenary talk are a parallel IoT Summit are planned. A student competition is also planned.
AMC2020 is the 16th in a series of biennial international workshops on Advanced Motion Control which aims to bring together researchers from both academia and industry and to promote omnipresent motion control technologies and applications.
The Optical Fiber Communication Conference and Exhibition (OFC) is the largest global conference and exhibition for optical communications and networking professionals. For over 40 years, OFC has drawn attendees from all corners of the globe to meet and greet, teach and learn, make connections and move business forward.OFC attracts the biggest names in the field, offers key networking and partnering opportunities, and provides insights and inspiration on the major trends and technology advances affecting the industry. From technical presentations to the latest market trends and predictions, OFC is a one-stop-shop.
Everything to do with radar hardware, techniques, processing and systems.
The conference program will consist of plenary lectures, symposia, workshops and invitedsessions of the latest significant findings and developments in all the major fields of biomedical engineering.Submitted papers will be peer reviewed. Accepted high quality papers will be presented in oral and postersessions, will appear in the Conference Proceedings and will be indexed in PubMed/MEDLINE
The IEEE Aerospace and Electronic Systems Magazine publishes articles concerned with the various aspects of systems for space, air, ocean, or ground environments.
Experimental and theoretical advances in antennas including design and development, and in the propagation of electromagnetic waves including scattering, diffraction and interaction with continuous media; and applications pertinent to antennas and propagation, such as remote sensing, applied optics, and millimeter and submillimeter wave techniques.
Contains articles on the applications and other relevant technology. Electronic applications include analog and digital circuits employing thin films and active devices such as Josephson junctions. Power applications include magnet design as well asmotors, generators, and power transmission
Speech analysis, synthesis, coding speech recognition, speaker recognition, language modeling, speech production and perception, speech enhancement. In audio, transducers, room acoustics, active sound control, human audition, analysis/synthesis/coding of music, and consumer audio. (8) (IEEE Guide for Authors) The scope for the proposed transactions includes SPEECH PROCESSING - Transmission and storage of Speech signals; speech coding; speech enhancement and noise reduction; ...
The theory, design and application of Control Systems. It shall encompass components, and the integration of these components, as are necessary for the construction of such systems. The word `systems' as used herein shall be interpreted to include physical, biological, organizational and other entities and combinations thereof, which can be represented through a mathematical symbolism. The Field of Interest: shall ...
2017 International Conference on ENERGY and ENVIRONMENT (CIEM), 2017
Little research was carried out in the field of acoustic casings for HVAC equipment. In this study, we experimentally analyzed the influence of the casing geometry with regard to the acoustic environment. Two casings (cuboid shape and semi-cylindrical shape) were compared according to their experimentally assessed sound power level. The parameters calculated were the sound pressure and power levels. The ...
Proceedings of the 6th International Conference on Properties and Applications of Dielectric Materials (Cat. No.00CH36347), 2000
This paper applies a pattern recognition method for localisation of the PD site in the oil-filled transformer by acoustic measurements. By dividing the transformer into N numbers of 20/spl times/20/spl times/20 mm/sup 3/ sub- modules, the PD site is localised by comparing the spatial distances of each sub-module to the acoustic sensors. The numerical cases indicate that the proposed method ...
2006 IEEE Ultrasonics Symposium, 2006
The wave propagation in anisotropic 3D structures with arbitrary geometries is numerically calculated in order to interpret laser acoustic measurements in microstructures. The laser acoustic Pump-Probe technique generates bulk waves in structures in a thermo elastic way. Here, the wave propagation for various geometries and materials is investigated. In the first part, the wave propagation in isotropic, axisymmetric structures is ...
1999 Annual Report Conference on Electrical Insulation and Dielectric Phenomena (Cat. No.99CH36319), 1999
In this paper single- and three-phase SF/sub 6/ gas-insulated switchgear (GIS) are compared with respect to the effects and the criticality of moving particles. To summarize the sensitivity of different GIS designs to moving particles, an evaluation of many calculated trajectories is presented. Some of the calculated results are verified by optically recorded trajectories of a particle moving in the ...
OCEANS 2008, 2008
Self-contained, moored echo sounders are a means of monitoring the behavior of populations of zooplankton and small fish over extended periods of time. Such instruments, either moored at or near the seafloor looking upward, or mounted on a surface buoy looking downward, record profiles of acoustic backscatter as a time series, and thus can provide insights into the long-term behavior ...
Yamaha's Avant Grand Digital Piano Mimics Acoustic
IMS 2012 Microapps - Use of FPGAs for Faster Test Times and Repeatability on Cellular Measurements
IMS 2011 Microapps - Time Domain Measurements in Waveguide
IMS 2011 Microapps - Pulsed S-Parameter Measurements Using PXI Instruments
Single Crystal AlGaN Bulk Acoustic Wave Resonators on Silicon Substrates with High Electromechanical Coupling: RFIC Industry Showcase
Brooklyn 5G - 2015 - Andreas F. Molisch - Channel Measurements for Massive MIMO
IMS 2011 Microapps - IQ Mixer Measurements: Techniques for Complete Characterization of IQ Mixers Using a Multi-Port Vector Network Analyzer
IMS 2012 Microapps - Basic Amplifier Measurements with the RF Vector Network Analyzer (VNA) Taku Hirato, Agilent
IMS 2012 Microapps - Generation and Analysis Techniques for Cost-efficient SATCOM Measurements Richard Overdorf, Agilent
IMS MicroApps: Nonlinear Co-Simulation with Real-Time Channel Measurements
Panel Session: 5G Test and Measurements - 5G Summit at IMS 2017
ISEC 2013 Special Gordon Donaldson Session: Remembering Gordon Donaldson - 6 of 7 - A high sensitive magnetometer system for natural magnetic field measurements
Introducing the Kalman Filter
Micro-Apps 2013: Determining Circuit Material Dielectric Constant from Phase Measurements
Contactless Wireless Sensing - Shyam Gollakota - IEEE EMBS at NIH, 2019
Brooklyn 5G Summit 2014: Channel Measurements Summary by Ted Rappaport
Phase Retrieval with Application to Optical Imaging
Spectrum Analysis: RF Boot Camp
MicroApps: New Calibration Method Simplifes Measurements of Fixtured Devices (Agilent Technologies)
Little research was carried out in the field of acoustic casings for HVAC equipment. In this study, we experimentally analyzed the influence of the casing geometry with regard to the acoustic environment. Two casings (cuboid shape and semi-cylindrical shape) were compared according to their experimentally assessed sound power level. The parameters calculated were the sound pressure and power levels. The experimental study proves that the shape of the casing can indeed have an influence on the sound energy radiated outside. Generally, we obtained that for low frequencies (16Hz-250Hz) the semi-cylindrical casing has a better acoustic behavior, for median frequencies (500Hz-1000Hz) the cuboid casing has better acoustic performance and for high frequencies (2000Hz-16000Hz) both casings have similar performance. Further, in-depth research regarding the influence of the mass, joinery and other specifications upon the acoustic indoor or outdoor environment is needed in order to understand the “optimal” shape for equipment casing.
This paper applies a pattern recognition method for localisation of the PD site in the oil-filled transformer by acoustic measurements. By dividing the transformer into N numbers of 20/spl times/20/spl times/20 mm/sup 3/ sub- modules, the PD site is localised by comparing the spatial distances of each sub-module to the acoustic sensors. The numerical cases indicate that the proposed method is general and practical while avoiding some drawbacks in current algorithms. Moreover, the method improves the accuracy of localisation substantially when compared with the conventional localization method.
The wave propagation in anisotropic 3D structures with arbitrary geometries is numerically calculated in order to interpret laser acoustic measurements in microstructures. The laser acoustic Pump-Probe technique generates bulk waves in structures in a thermo elastic way. Here, the wave propagation for various geometries and materials is investigated. In the first part, the wave propagation in isotropic, axisymmetric structures is simulated with a 2D finite difference formulation. The numerical results are verified with measurements of macroscopic specimens. In a second step, the simulations are extended to 3D structures with anisotropic material properties. The implemented code allows the calculation of the wave propagation for different orientations of the material axes (orientation of the orthotropic axes relative to the geometry of the structure). Limits of the presented algorithms are discussed and future directions of the on-going research project are presented
In this paper single- and three-phase SF/sub 6/ gas-insulated switchgear (GIS) are compared with respect to the effects and the criticality of moving particles. To summarize the sensitivity of different GIS designs to moving particles, an evaluation of many calculated trajectories is presented. Some of the calculated results are verified by optically recorded trajectories of a particle moving in the laboratory GIS setup. As an evident result, which is also supported by acoustic measurements, the particle movement is minor in three-phase enclosures. Characteristic flight patterns demonstrate if the particle, depending on its size, contacts the high-voltage electrode or not. In the first case, a breakdown of the isolating distance gets predictable. The experimental setup, the test-vessel, and the modular components are described. The comparison is limited to rated voltages up to U=170 kV (AC, 50 Hz).
Self-contained, moored echo sounders are a means of monitoring the behavior of populations of zooplankton and small fish over extended periods of time. Such instruments, either moored at or near the seafloor looking upward, or mounted on a surface buoy looking downward, record profiles of acoustic backscatter as a time series, and thus can provide insights into the long-term behavior and distribution of these populations. Single-frequency instruments are not capable of identifying the source of acoustic backscatter as species, but nevertheless can provide valuable information with low-cost, easily-deployed instrumentation over extended periods of time. This type of data can be collected either with an echo sounder designed for the task, or as an auxiliary output of an ADCP, using the RSSI (Received Signal Strength Indicator) output. In each case, without precise instrument calibration, an estimation of volume backscatter strength can be made from the data recorded by the two types of instrument. In this paper, we will compare the capabilities of an example of each type of instrument in terms of their spatial and temporal resolution and deployment endurance for extended monitoring. Calibration issues will also be discussed. In June 2004, a 200 kHz Acoustic Water Column Profiler (Version 4) and a 300 kHz RDI ADCP were co- located in Saanich Inlet, BC. The instruments were mounted on a surface buoy looking downward in 150 metres water depth for a period of 10 days. The two instruments were configured to operate with similar range and time resolution. The ADCP recorded a 30-ping ensemble every minute in 1 metre range bins. The AWCP4 recorded a 3-ping average every 12 seconds with 0.5 m range resolution. The sampling regions of the two instruments were not exactly co-located, but were close enough to show the same larger scale features. Echograms from the two clearly show the two primary zooplankton populations in the Inlet, one migrating diurnally, and the other remaining at depth. Data from both instruments, when converted to volume backscatter strength are in agreement within the limitations of their approximate calibrations. Examples of these will be shown. The difference in performance between the two instruments appears when longer or more-frequently sampled deployments are considered. With the spatial and temporal resolution used in the Saanich Inlet deployment, the ADCP is limited to a 20-day deployment on a standard battery pack (80 days would be possible if 2 more batteries were added in an external case). The AWCP4, in contrast, would last over 8 months operating with those parameters. Operating the ADCP to achieve high-resolution backscatter data also degrades its performance in measuring current velocity in most cases. The AWCP4 therefore allows greater temporal and spatial resolution over the extended monitoring periods of many months that are one of the primary motivations for using a single-frequency instrument. The AWCP4 has recently been replaced by a new model, the AWCP5, which has increased data storage (up to 16 GBytes vs. 138 Mbytes), greater flexibility in choice of sampling strategies and 16-bit as opposed to 8-bit digitization for greater dynamic range. The AWCP5 offers even greater advantages in time and space resolution and length of operation for acoustically monitoring zooplankton populations.
A method used to determine the vocal-tract cross-sectional area function from acoustical measurements at the lips is analyzed. Under the framework described by Sondhi and Gopinath (1971) and implemented by Sondhi and Resnick (1983), a sensitivity analysis of the vocal-tract area function, derived from the impedance or reflectance at the lips is performed. It indicates that, in the ideal case, the area function is not heavily affected by random distortions of the impulse response at the lips. Simulations and real measurements show that the method works relatively well, except for regions behind narrow constrictions. In this case, an excitation pulse with high energy, as well as a fine sampling, proved to be important. The excitation used is a time stretched pulse. It produces an excitation with high energy without the necessity of a high power sound generator device.
Partial discharges (PD) deteriorate insulation of power apparatus and lead to final failure. Early detection and localization of PD can avoid unwanted failure of power apparatus. There are different techniques for PD detection. Acoustic emission technique for partial discharge detection is advantageous for online detection and source location. Normally, acoustic PD detection and location is based on the assumption of a single PD source. But in practice, more than one source of PD is present and they may be active simultaneously in a power apparatus. This paper addresses the identification and localization of two simultaneous PD sources employing acoustic emission technique in oil pressboard insulation system. The PDAE signals from two simultaneous PD sources are analyzed using wavelet analysis with time frequency resolution and Independent Component Analysis for identification and localization.
An investigation is conducted of the possibility of reconstructing images of current dipoles in a volume conductor from data obtained by the magnetoacoustic technique. A modified form of the algebraic reconstruction technique (ART) is used. Reconstruction results of simulated data show that it is possible to find the location, relative magnitude, and orientation of the dipoles with reasonable accuracy for simple dipole configurations.<<ETX>>
A novel experimental method involving an autonomous underwater vehicle (AUV) with a towed hydrophone array has been developed to measure the single path interaction from the surface, bottom and volume of the shallow water waveguide. The system is designed to operate from the low (/spl sim/100 Hz) to the mid frequencies (/spl les/10 kHz) with a directional source. The effects of surface, volume, and bottom scattering on the coherency of direct and direct-reflected signals are difficult to measure and a mobile directional receiver provides an adaptive capability. For example, the quantification of the role micro-bubble layers near the surface and in surface ship wakes plays on the coherency and scattering of sound could be measured with this device. In addition, an AUV with a hydrophone array can be easily and rapidly deployed and because of its mobility can provide area wide characterization. However, AUV radiated noise measurements indicated vehicle noise would limit the ability of hull-mounted or interior hydrophone arrays and thus suggested the use of a low noise towed array. The AUV discussed here is the Remus vehicle, a tested as well as a readily-available tow platform for a small low drag array. To demonstrate the ability of Remus to act as a low noise tow vehicle, radiated noise measurements were made on the vehicle at Dodge Pond acoustic test facility. The vehicle was rotated on a shaft at a depth of 8 meters and calibrated noise levels measured at 13 meters distance. At the maximum rpm of the AUV, the 1/3/sup rd/ octave noise level, when converted to source level by the calibrated transmission factor, was 130 dB re 1/spl mu/Pa at 1 m. This would represent the radiated noise source level for a vehicle moving at 3 knots. A small-diameter (2.8 cm O.D.) fluid-filled hydrophone array has been developed with 6 channels spaced evenly at 0.75 meters, each channel having a receiving sensitivity of -174 dB re 1/spl mu/Pa/V from 100 Hz to 10 kHz. The recording system consisted of three commercial off-the-shelf (COTS) battery powered mini-disc recorders with a 20 kHz band pass, sampling frequency of 44 kHz and a 16 bit analog to digital converter providing storage capability of 90 minutes of raw data. The prototype system was deployed in a "proof-of- concept" test at the Dodge Pond test facility. The vehicle was programmed to navigate along paths that provided straight courses as well as several turns to determine the operational characteristics of the system. Results on capabilities of the vehicle with the towed system are presented including vehicle and array noise, beamforming, and element localization.
A pattern recognition method for localisation of the partial discharge (PD) site in an oil-filled transformer by acoustic measurements is presented. By dividing the transformer into a number of 20/spl times/20/spl times/20 mm/sup 3/ sub-modules, the PD site is localised by comparing the spatial distance of each sub-module to the acoustic sensors. The numerical cases indicate that the proposed method is general and practical, while avoiding some drawbacks in current algorithms. Moreover, the method improves the accuracy of localisation substantially when compared with the conventional localisation method.
This standard provides the techniques and rationale for referencing acoustic telephony measurements to the free field. It applies to ear related measurements such as receive, sidetone and overall.
This standard provides the techniques for objective measurement of electroacoustic characteristics of analog and digital telephones, handsets and headsets. Application is in the frequency range from 100 Hz to 8500 Hz. Although not specifically within the scope of this standard, the methods described are generally applicable to a wide variety of other communications equipment, including cordless, wireless and mobile communications ...