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Biothesiometry is a noninvasive medical test used to quantify the perception of vibration by measuring its threshold. [1] It is used in neurology and electrophysiology to diagnose a number of conditions, like diabetic neuropathy and erectile dysfunction , where the vibration perception threshold (VPT) would be higher than average.
Brüel & Kjær (Sound and Vibration Measurement A/S) is a Danish multinational engineering and electronics company headquartered in Nærum, near Copenhagen. It was the largest producer in the world of equipment for acoustic and vibrational measurements.
Magnetic field must be strong enough to fully saturate the samples (or else inaccurate measurements will be taken) Magnetic field must be uniform across the sample space (otherwise the addition of field gradients [5] [7] will induce force that alter the vibration once again leading to inaccurate results
In contrast to contact measuring methods, the test object is unaffected by the vibration measuring process. Vibrometry covers a huge range of applications such as the study of microstructures moving only a few pm at frequencies up to 2.5 GHz, all the way up to the intense dynamics occurring in Formula 1 engines with vibration velocities ...
A vibrometer is generally a two beam laser interferometer that measures the frequency (or phase) difference between an internal reference beam and a test beam. The most common type of laser in an LDV is the helium–neon laser, although laser diodes, fiber lasers, and Nd:YAG lasers are also used.
In 2002, Fluke purchased DNI Nevada (formerly Dynatech Nevada/Neurodyne-Dempsey), a Carson City, Nevada based manufacturer of medical test equipment, [4] best known for being the original makers of the FitTester 3000 quantitative respirator fit test machine. [5]
The panel of tests examine a broad range of different sensations, including hot, cold, touch, vibration. It has both positive and negative tests (can test for increased or reduced sensitivity). QST reflects a formalisation of existing neurological tests into a standardised battery designed to detect subtle changes in sensory function. [ 1 ]
The natural frequency of this flexural vibration mode is characteristic for the dynamic Young's modulus. To minimize the damping of the test-piece, it has to be supported at the nodes where the vibration amplitude is zero. The test-piece is mechanically excited at one of the anti-nodes to cause maximum vibration. Test-piece vibrating in the ...
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