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.
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TL;DR: In this article, acoustic emission (AE) signals were used to investigate the contact force occurring at the head/disk interface of a computer hard drive, and the transfer function was established from the harmonic response derived at different vibration modes and frequencies.
22 citations
TL;DR: In this article, a high sensitivity pulsed laser vibrometer that is capable of detecting optically rough surfaces vibrating with the displacement value of 75 pm as well as its application as a laser microphone is presented.
Abstract: We experimentally demonstrate a high sensitivity pulsed laser vibrometer that is capable of detecting optically rough surfaces vibrating with the displacement value of 75 pm as well as its application as a laser microphone. By directing the probe light beam repeatedly onto the vibrating diaphragm and/or pressure sensing interface, the sensitivity of the pulsed laser vibrometer in detecting the displacement of the vibrating diaphragm is significantly improved down to an estimated value of less than 4 pm In this paper, we present the principles of operation of this new kind of laser microphone together with experimental validations.
22 citations
TL;DR: In this article, the authors investigated the feasibility of detecting local damage in a bridge using laser Doppler Vibrometer (LDV) measurements taken from a vehicle as it passes over the bridge.
Abstract: This paper investigates the feasibility of detecting local damage in a bridge using Laser Doppler Vibrometer (LDV) measurements taken from a vehicle as it passes over the bridge. Six LDVs are simulated numerically on a moving vehicle, collecting relative velocity data between the vehicle and the bridge. It is shown that Instantaneous Curvature (IC) at a moving reference, which is the curvature of the bridge at an instant in time, is sensitive to local damage. The vehicle measures Rate of Instantaneous Curvature (RIC), defined as the first derivative of IC with respect to time. A moving average filter is found to reduce the effects of noise on the RIC data. A comparison of filtered RIC measurements in healthy and damaged bridges shows that local damage can be detected well with noise-free measurements and can still be detected in the presence of noise.
22 citations
TL;DR: In this paper, a comparison between analytical, numerical and experimental data of a cantilever with integrated thermal actuator and piezoresistive sensor, suitable for fast scanning probe microscopy (SPM) and lithography (SPL) is presented.
22 citations
Patent•
17 May 2001
TL;DR: In this article, a method for measuring the energy and position of a pulsed laser beam in an ophthalmologic excimer laser is described. But the method is not suitable for the measurement of the laser beam itself.
Abstract: The invention relates to a device and method for measuring the energy and/or the position of a pulsed laser beam, notably in an ophthalmologic excimer laser. The pulsed laser beam is intermittently directed at a sensor which detects its energy and/or position.
22 citations