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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
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Journal ArticleDOI
TL;DR: In the current measurement approach, air-coupled excitation and laser interferometric detection are utilized and their effectiveness in characterizing the mechanical properties of a drug tablet by examining its vibrational resonance frequencies is demonstrated.

28 citations

Journal ArticleDOI
Jianhua Shang1, Yan He1, Dan Liu1, Huaguo Zang1, Weibiao Chen1 
TL;DR: Based on the correlation theories of heterodyne detection, a laser Doppler vibrometer (LDV) was developed to detect the sound signal through the vibration of glass as mentioned in this paper.
Abstract: Laser Doppler vibrometer (LDV) has a potential application prospect in remote sensing. Based on the correlation theories of heterodyne detection, a LDV system with a configuration of all fiber and heterodyne techniques is developed to detect the sound signal through the vibration of glass. Experimental results show that the LDV system has an ability to acquire the real-time speech signal 25 m away through glass. While, the system signal-to-noise ratio (SNR) value decreases with the increase of the glass thickness and the detection distance.

28 citations

Patent
16 Jun 2005
TL;DR: In this paper, a laser material manipulation system is provided for material processing, such as laser ablation, laser deposition and laser machining, which includes a laser for emitting laser pulses and a laser imaging device having an array of controllable imaging elements.
Abstract: A laser material manipulation system is provided for material processing, such as laser ablation, laser deposition and laser machining. The system includes a laser for emitting laser pulses and a laser imaging device having an array of controllable imaging elements. The laser imaging device receives the laser pulses emitted from the laser, forms a laser image through the controllable imaging elements, and projects the laser image onto a target material which is to be processed. The projected laser image processes the material according to a desired pattern. The laser can be a femtosecond laser. The laser imaging device can be a liquid crystal display (LCD) or a digital micromirror device (DMD). An SEM can be used for monitoring the material distribution and dynamically adjust the laser image according to the monitor result.

28 citations

Journal ArticleDOI
TL;DR: In this paper, head-disk contacts in a disk file with a rotary actuator were examined during load/unload using laser Doppler vibrometry and acoustic emission techniques.
Abstract: Head-disk contacts in a disk file with a rotary actuator are examined during load/unload using laser Doppler vibrometry and acoustic emission techniques. A novel scheme that allows tracking of the slider with the laser beam of a laser Doppler vibrometer during load/unload is implemented. Head-disk contacts are found to occur as a function of the velocity of the slider along the inclined ramp prior to loading, and it is shown that a low vertical loading velocity is less likely to introduce head-disk contacts than a high loading velocity. For the swing-arm actuated drive investigated, head-disk contacts start to appear at loading velocities as low as 25 mm/s. A careful design of the tip of the ramp is of utmost importance in ramp loading mechanisms to reduce the effective vertical component of the slider as it comes off the tip of the ramp during loading. >

28 citations

Journal ArticleDOI
TL;DR: In this article, the authors report on the development of a versatile vibrometer for characterizing in-plane microelectromechanical systems (MEMS) motion, which combines conventional optical components (microscope objective or macrozoom lens) and a home-made light-emitting diode (LED) stroboscope with incremental phase shifts.
Abstract: We report on the development of a versatile vibrometer for characterizing in-plane microelectromechanical systems (MEMS) motion It combines conventional optical components (microscope objective or macrozoom lens) and a home-made light-emitting diode (LED) stroboscope with incremental phase shifts The system drives a digital charge-coupled device camera to record a video sequence of the moving MEMS “frozen” by the strobe LED at four equally spaced phases The periodic motion of the specimen is accurately estimated by computing the values of displacements between successive images We obtained the subpixel accuracy using an interpolation and correlation motion estimation algorithm By using this technique, we analyzed vibrations of a silicon microprobe made for scanning probe microscopy We determined both its natural vibration and mode shapes The nanometer resolution of the displacement is reached using a microscope, and the mode shapes are imaged using a macrolens with a large field of view (10 mm) Th

28 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202381
2022177
2021122
2020142
2019134
2018174