Topic
Laser Doppler vibrometer
About: Laser Doppler vibrometer is a research topic. Over the lifetime, 6319 publications have been published within this topic receiving 76068 citations.
Papers published on a yearly basis
Papers
More filters
TL;DR: In this article, a network of transducers that are used to sequentially scan the structure before and after the presence of damage by transmitting and receiving Lamb wave pulses is proposed, and a damage localization image is reconstructed by analyzing the cross-correlation of the scatter signal envelope with the excitation pulse envelope for each transducer pair.
Abstract: This paper presents the application of Lamb waves to inspect damage in composite laminates. The proposed methodology employs a network of transducers that are used to sequentially scan the structure before and after the presence of damage by transmitting and receiving Lamb wave pulses. A damage localization image is reconstructed by analyzing the cross-correlation of the scatter signal envelope with the excitation pulse envelope for each transducer pair. A potential damage area is then reconstructed by superimposing the image observed from each actuator and sensor signal path. Both numerical and experimental case studies are used to verify the proposed methodology for composite laminates. Three-dimensional finite element models with a transducer network consisting of four transducer elements are used in the numerical case studies. The experimental case studies employ a transducer network using four piezoelectric transducers as transmitter elements and a laser vibrometer to measure the response signals at four locations close to the transducers. The results show that the method enables the reliable detection of structural damage with locating inaccuracies of the order of a few millimeters inside as well as outside of an inspection area of 100 x 100 mm(2).
154 citations
TL;DR: The most important advantage of laser-velocimetry vis-à-vis the Mössbauer technique is its linearity, which permits undistorted recording of signals over a wide velocity range.
153 citations
TL;DR: In this article, it is demonstrated that time-resolved measurements up to 800 kHz can be performed with a lateral resolution in the micrometer range and a vibration amplitude detection limit of 3-5nm.
151 citations
TL;DR: Laser Doppler flowmeter measurement technique for localized flow velocities in gas is described in this paper, noting reliability for high flow velocity in gas and noting reliability of high flow veloities.
Abstract: Laser Doppler flowmeter measurement technique for localized flow velocities in gas, noting reliability for high flow velocities
147 citations
TL;DR: In this article, a nonlinear recursive filter and a non-contact computer vision based algorithm is used to measure structural dynamic responses, and an unscented Kalman filter is employed to predict structural properties such as stiffness and damping coefficients.
143 citations