Full-field vibration measurements of the violin using digital stroboscopic holographic interferometry and electromagnetic stimulation of the strings

2016 ◽  
Author(s):  
Lissa Keersmaekers ◽  
William Keustermans ◽  
Daniël De Greef ◽  
Joris J. J. Dirckx
Keyword(s):  
Holographic Interferometry ◽  
Vibration Measurements ◽  
Full Field ◽  
Electromagnetic Stimulation ◽  
Stimulation Of

scholarly journals Assessment of magnetic flux density properties of electromagnetic noninvasive phrenic nerve stimulations for environmental safety in an ICU environment

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
K. Friedrich Kuhn ◽  
Julius J. Grunow ◽  
Pascal Leimer ◽  
Marco Lorenz ◽  
David Berger ◽  
...  
Keyword(s):  
Intensive Care Unit ◽  
Intensive Care ◽  
Magnetic Flux ◽  
Flux Density ◽  
Muscle Fiber ◽  
Phrenic Nerve ◽  
Magnetic Flux Density ◽  
Training Center ◽  
Electromagnetic Stimulation ◽  
Stimulation Of

AbstractDiaphragm weakness affects up to 60% of ventilated patients leading to muscle atrophy, reduction of muscle fiber force via muscle fiber injuries and prolonged weaning from mechanical ventilation. Electromagnetic stimulation of the phrenic nerve can induce contractions of the diaphragm and potentially prevent and treat loss of muscular function. Recommended safety distance of electromagnetic coils is 1 m. The aim of this study was to investigate the magnetic flux density in a typical intensive care unit (ICU) setting. Simulation of magnetic flux density generated by a butterfly coil was performed in a Berlin ICU training center with testing of potential disturbance and heating of medical equipment. Approximate safety distances to surrounding medical ICU equipment were additionally measured in an ICU training center in Bern. Magnetic flux density declined exponentially with advancing distance from the stimulation coil. Above a coil distance of 300 mm with stimulation of 100% power the signal could not be distinguished from the surrounding magnetic background noise. Electromagnetic stimulation of the phrenic nerve for diaphragm contraction in an intensive care unit setting seems to be safe and feasible from a technical point of view with a distance above 300 mm to ICU equipment from the stimulation coil.

scholarly journals Electroretinography in dogs: a review 

2014 ◽  
Vol 59 (No. 11) ◽  
pp. 515-526 ◽  
Author(s):  
M. Drazek ◽  
M. Lew ◽  
S. Lew ◽  
A. Pomianowski
Keyword(s):  
Small Animal ◽  
Cell Types ◽  
Time Varying ◽  
Outer Retina ◽  
Light Stimulation ◽  
Full Field ◽  
Retinal Disorders ◽  
Spatially Distributed ◽  
Different Cell Types ◽  
Stimulation Of

Electroretinography (ERG) in the form of full-field, flash ERG is the most commonly used technique in veterinary ophthalmology for diagnosing the functioning of the outer retina. Under light stimulation spatially distributed different cell types within the retina produce time-varying electric responses. These are recorded in the form of ERG traces consisting of a series of positive and negative wavelets. The possibility of selective stimulation of individual types of retinal cells and the analysis of constituent components of ERGs are the basis for determining the source of abnormalities and diagnosis of various types of dysfunction. In many cases, the ERG allows diagnosis of hereditary retinal disorders in dogs before the appearance of behavioural and ophthalmoscopic symptoms. This review is an introduction to the electrophysiology of vision, intended for small animal practitioners, and aimed at presenting the benefits of ERG for early ophthalmic diagnostics in dogs.

scholarly journals Digital Holographic Interferometry in the Long-Wave Infrared Range for Measuring Large Deformations of Space Components under Thermal-Vacuum Testing

Proceedings ◽  
2018 ◽  
Vol 2 (8) ◽  
pp. 534
Author(s):  
Jean-François Vandenrijt ◽  
Cédric Thizy ◽  
Fabian Languy ◽  
Marc Georges
Keyword(s):  
Holographic Interferometry ◽  
Space Structures ◽  
Large Temperature ◽  
Infrared Range ◽  
Thermal Vacuum ◽  
Full Field ◽  
Space Industry ◽  
Long Wave Infrared ◽  
Space Conditions ◽  
Vacuum Testing

Holographic interferometry at around 10 µm wavelengths has many advantages. It offers the possibility of large deformation measurement, while being much less sensitive to external perturbations. We present the state-of-the art of this technique applied to several industrial cases of the space industry. In particular, we demonstrate that the technique is well adapted to measurement of full-field deformation maps of space structures undergoing large temperature variations typical to what they experience in space conditions.

Sign in / Sign up

Export Citation Format

Share Document