Structure-Borne Sound Characterization of Coupled Structures—Part I: Simple Demonstrator Model

2010 ◽  
Vol 132 (4) ◽  
Author(s):  
Goran Pavić ◽  
Andrew S. Elliott
Keyword(s):  
Measurement Procedure ◽  
Small Error ◽  
Virtual Experiment ◽  
Vibration Source ◽  
Benchmark Test ◽  
Coupled Structures ◽  
Principal Method ◽  
Practical Sense

A method has been developed to characterize a vibration source when coupled via resilient mounts to a receiver structure. This two-step measurement procedure can deliver the mobility and free velocity of a source, together with the mobility of the receiver to which it is connected, without decoupling the two structures. The method is feasible in a practical sense as it does not require any knowledge of mount properties. This is a major advantage as mount properties can deviate from their stated specifications through tolerances, and furthermore, the properties may change when loaded in the coupled-state. A benchmark test is used as a validation reference for the method where the properties of the resilient mounts are required and are assumed as known but not completely certain. The comparison of the benchmark and the principal method is used to illustrate the benefits of the latter given a small error in the supposedly known mount properties. In this first part of the paper, the principles of the two methods are illustrated using a simple demonstrator example while in the second part the feasibility of the method is further examined by virtual experiment involving two built-up plates resiliently connected at several points.

Structure-Borne Sound Characterization of Coupled Structures—Part II: Feasibility Study

2010 ◽  
Vol 132 (4) ◽  
Author(s):  
Goran Pavić ◽  
Andrew S. Elliott
Keyword(s):  
Feasibility Study ◽  
Small Error ◽  
Point Of View ◽  
Virtual Experiment ◽  
Vibration Source ◽  
Benchmark Test ◽  
Novel Method ◽  
Coupled Structures ◽  
Principal Method

A novel method has been outlined in the first part of this paper aimed at characterization of structure-borne sound transmission from a vibration source coupled via resilient mounts to a receiver. It can deliver the source mobility and its free velocity, together with the mobility of the receiver to which the source is connected, without decoupling the two structures. The only condition which has to be fulfilled is the conservation of coupling forces and moments across the mounts. In this part of the paper the method is examined from the feasibility point of view. A benchmark test is used as a validation reference for the method, where the properties of the resilient mounts are required and are assumed as known but not completely certain. The feasibility of the principal method is tested by virtual experiment involving two built-up plates resiliently connected at several points. The comparison of the benchmark and the principal method is used to illustrate the benefits of the latter given a small error in the supposedly known mount properties.

Engineering and Characterization of Resonant Optical Antennas

2010 ◽  
Vol 1248 ◽  
Author(s):  
Matthias D. Wissert ◽  
Andreas W. Schell ◽  
Konstantin S. Ilin ◽  
M. Siegel ◽  
U. Lemmer ◽  
...  
Keyword(s):  
Electron Beam Lithography ◽  
Dark Field ◽  
Optical Antennas ◽  
Dipole Antennas ◽  
Split Ring ◽  
Dark Field Microscopy ◽  
Scattering Spectra ◽  
Coupled Structures ◽  
Spectral Redshift

AbstractResonant optical dipole antennas, consisting either of two arms coupled by a small gap or of a single, uncoupled arm only, are fabricated by the application of electron beam lithography and gold evaporation. Using dark-field microscopy, scattering spectra of structures with varied antenna arm length and varied gap size are obtained. The results show not only a spectral redshift for coupled structures compared to single arm structures, but also that the far-field scattering intensity is significantly higher for two arm structures with gap. In addition to the dipole structures, first fabrication results on quadrupole antennas and split-ring antennas are presented, offering novel pathways for an enhancement of the optical response function.

scholarly journals Experimental Characterization of Ultra-Wideband Channel Parameter Measurements in an Underground Mine

2011 ◽  
Vol 2011 ◽  
pp. 1-7 ◽  
Author(s):  
B. Nkakanou ◽  
G. Y. Delisle ◽  
N. Hakem
Keyword(s):  
Underground Mining ◽  
Path Loss ◽  
Measurement Procedure ◽  
Ultra Wideband ◽  
Small Scale ◽  
Scale Parameters ◽  
Channel Parameter ◽  
Channel Parameters ◽  
Uwb Channel

Experimental results for an ultra-wideband (UWB) channel parameters in an underground mining environment over a frequency range of 3 GHz to 10 GHz are reported. The measurements were taken both in LOS and NLOS cases in two different size mine galleries. In the NLOS case, results were acquired for different corridor obstruction angles. The results were obtained during an extensive measurement campaign in the UWB frequency, and the measurement procedure allows both the large- and small-scale parameters such as the path loss exponent, coherence bandwidth, and so forth, to be quantified. The capacity of the UWB channel as a function of the physical depth of the mine gallery has also been recorded for comparison purposes.

scholarly journals A sensitivity analysis of the stepwise measurement procedure for the characterization of large area PV modules

Solar Energy ◽  
2016 ◽  
Vol 127 ◽  
pp. 96-108
Author(s):  
Christoph Rapp ◽  
Marc Steiner ◽  
Gerald Siefer ◽  
Andreas W. Bett
Keyword(s):  
Sensitivity Analysis ◽  
Measurement Procedure ◽  
Large Area ◽  
Pv Modules

scholarly journals Reconstruction of few-fs XUV pulses with a perturbative approach

2021 ◽  
Vol 255 ◽  
pp. 11008
Author(s):  
Bruno Moio ◽  
Fabio Medeghini ◽  
Gian Luca Dolso ◽  
Giacomo Inzani ◽  
Nicola Di Palo ◽  
...  
Keyword(s):  
Extreme Ultraviolet ◽  
Measurement Procedure ◽  
Ultrafast Dynamics ◽  
Perturbative Approach ◽  
Pump Probe ◽  
Physical Systems ◽  
Require Time ◽  
Perturbative Regime ◽  
Pump Probe Experiment

A precise temporal characterization of the pulses involved in pump-probe experiments is crucial for a proper investigation of the ultrafast dynamics in several physical systems. Indeed, it is required for the assessment of the dynamical properties under examination with sufficient temporal resolution. In the fewfs/attosecond domain, typical reconstruction procedures require time-consuming interative methods, which are also sensitive to the experimental noise and to the distortion of the measurement. We developed an approach, called Simplified Trace Reconstruction In the Perturbative regimE (STRIPE), which allows us for a precise characterization of the infrared (IR) and extreme ultraviolet (XUV) pulses, used in a pump-probe experiment. Our method is not based on a phase retrival algorithm, and for this it is typically much faster than the other ones currently known. Moreover, it allows for easily including in the reconstruction the experimental non-idealities that may affect the measurement, like possible distortion due to the measurement procedure itself.

Characterization of FeMn(N)/FeMn/Permalloy exchange coupled structures

1988 ◽  
Vol 64 (10) ◽  
pp. 6118-6120 ◽  
Author(s):  
J. K. Howard ◽  
T. C. Huang
Keyword(s):  
Coupled Structures

scholarly journals Spatial Wavefunction Characterization of Femtosecond Pulses at Single-Photon Level

Research ◽  
2020 ◽  
Vol 2020 ◽  
pp. 1-8
Author(s):  
Billy Lam ◽  
Mohamed ElKabbash ◽  
Jihua Zhang ◽  
Chunlei Guo
Keyword(s):  
Light Source ◽  
Continuous Wave ◽  
Single Photon ◽  
Quantum Tomography ◽  
Measurement Procedure ◽  
Single Photons ◽  
Wave Source ◽  
Temporal Mode ◽  
Measurement Approach

Reading quantum information of single photons is commonly realized by quantum tomography or the direct (weak) measurement approach. However, these methods are time-consuming and face enormous challenges in characterizing single photons from an ultrafast light source due to the stringent temporal mode matching requirements. Here, we retrieve the spatial wavefunction of indistinguishable single photons from both a continuous wave source and a femtosecond light source using a self-referencing interferometer. Our method only requires nine ensemble-averaged measurements. This technique simplifies the measurement procedure of single-photon wavefunction and automatically mode matches each self-interfering single photon temporally, which enables the measurement of the spatial wavefunction of single photons from an ultrafast light source.

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