Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 10 of 10 for “"Laser Doppler Vibrometer (LDV)"”.
-
Reconstruction of 3-D structural dynamic response fields: an experimental, laser-based approach with statistical emphasis
… field from a set of 3-D projections based on Laser-Doppler-Vibrometer (LDV) localized instantaneous velocity measurements. Included along with an estimate of the 3-D velocity field, are its statistical characteristics and the inferential tools required to test the quality of the estimation. …
-
Vehicle Engine Classification Using of Laser Vibrometry Feature Extraction
<p>Used as a non-invasive and remote sensor, the laser Doppler vibrometer (LDV) has been used in many different applications, such as inspection of aircrafts, bridge and structure and remote voice acquisition. However, using LDV as a vehicle surveillance device has not been feasible due to the lack …
-
An Experimental Evaluation of the Experimental Spatial Dynamics Modeling (ESDM) Technique
… Included among such transducers is the scanning laser Doppler vibrometer (LDV). A scanning LDV can measure velocity at many structure locations. An important new technique, Experimental Spatial Dynamics Modeling (ESDM), utilizes such spatially dense velocity data. ESDM models continuous, …
-
A method for the spatial functionalization of the dynamic response of a structure with structural stability considerations
The scanning Laser Doppler Vibrometer (LDV) has developed into a useful tool for rapidly acquiring spatially dense structural dynamic response information in a noncontacting manner. The research presented in this paper is part of a larger project at the Structural Imaging and Modal Analysis …
-
Landmine detection with a standoff acoustic/laser technique
… threat. This paper explores a standoff acoustic/laser technique to discriminate landmines from other forms of man-made objects (clutter) in an urban environment. A novel approach currently under investigation by MIT Lincoln Labs, University of Mississippi, and other groups employs a non-contact …
-
A critical investigation of the use of infrared thermography in determining the condition of composite materials
… immersion ultrasonic testing, microscopy and laser doppler vibrometer (LDV). The aim was to establish TSA method as an alternative tool to detect surface breaking damage. It was found that pulsed thermography, though capable of detecting subsurface damage, was less sensitive to near surface …
-
Modeling and visualization of laser-based three-dimensional experimental spatial dynamic response
… experimental data from a scanning laser Doppler vibrometer (LDV). This instrument measures the surface velocity of vibrated structures. Time-signal data from the LDV is statistically modeled with multiple linear regression for harmonically excited structures. A weighted …
-
Laser Doppler Vibrometry Based Remote Sensing for Active Noise Control
… limit the performance of many ANC applications. Laser Doppler vibrometry, which works on the principle of optical interferometry, has been widely used in to measure vibrations in many vibro-acoustic applications. Yet, the developed instrument, laser Doppler vibrometer (LDV), has little been …
-
Fully electronic method of measuring post-release gap and gradient/residual stress of a MEMS cantilever
… with optical measurements from both a confocal laser microscope, and a Laser Doppler Vibrometer (LDV). In addition, the sensitivity of the algorithm to uncertainties in physical parameters are examined. This include: uncertainties in the dielectric constant of the substrate, the thickness and …
-
Bridge-vehicle interaction for structural health monitoring: potentials, applications, and limitations
Structural Health Monitoring (SHM) is an integral part of infrastructure maintenance and management systems due to socio-economic, safety and security reasons. The behaviour of a structure under vibration depends on structure characteristics. The change of structure characteristics may suggest the …