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 paper, the performance of the surface response to excitation (SuRE) method was evaluated with the conventional piezoelectric elements and scanning laser vibrometer used as contact and non-contact sensors, respectively, for monitoring the presence of loads on the surface.
37 citations
Patent•
13 Jul 2011
TL;DR: In this paper, a laser processing machine is provided which includes a chuck table adapted to hold a workpiece; and a laser beam irradiation unit for emitting a laserbeam to the workpiece held by the chuck table.
Abstract: A laser processing machine is provided which includes a chuck table adapted to hold a workpiece; and a laser beam irradiation unit for emitting a laser beam to the workpiece held by the chuck table. The laser beam irradiation unit includes a single laser beam oscillating unit for emitting a laser beam; a beam splitter which splits the laser beam emitted from the laser beam oscillating unit into a first laser beam propagating along a first path and a second laser beam propagating along a second path; a first condenser which condenses the first laser beam; and a second condenser which condenses the second laser beam.
37 citations
Patent•
28 Nov 1986TL;DR: In this article, a polygon mirror is constructed to have a reflecting surface which is defined by a curved surface having a predetermined radius of curvature, and when a transparent layer is formed on this reflecting surface, no distortion in scanning speed is produced even without using any electrical correction.
Abstract: A laser beam scanning system includes a laser for emitting a laser beam modulated with image information to be recorded and a deflecting device, such as polygon mirror, for deflecting the laser beam over a predetermined angle repetitively, so that the laser beam is scanned on a scanning surface, thereby an image is formed on the scanning surface. When a plurality of laser beams are used at the same time, the plurality of laser beams are arranged in an array inclined with respect to the scanning direction. In this case, a sync sensor generates a sync signal in response to a laser beam received in the first place. When a polygon mirror is so structured to have a reflecting surface which is defined by a curved surface having a predetermined radius of curvature, a fθ lens may be discarded. In this case, when a transparent layer is formed on this curved reflecting surface, no distortion in scanning speed is produced even without using any electrical correction. Besides, it is also preferable to control the intensity of laser beam so as to maintain the image density of a resultant image at constant.
37 citations
Patent•
29 Aug 1994TL;DR: In this paper, a laser light detector is provided which can be used to detect pulsed laser light that is produced by a rotating laser light source on a construction job site, and the detector provides an easily-read display which is indicative of the present level or elevation of the detector with respect to the plane of rotating laser lights.
Abstract: A laser light detector is provided which can be used to detect pulsed laser light that is produced by a rotating laser light source on a construction job site. The laser light detector provides an easily-read display which is indicative of the present level or elevation of the laser light detector with respect to the plane of rotating laser light. The laser light detector has a very large dynamic range, while maintaining a very good signal-to-noise ratio, and can, therefore, be used at both short and long distances from the rotating laser light source. The laser light detector is not dependent upon the energy level received of laser light, or by the spot size of laser light as it reaches the light detectors. The laser light detector is available with several options, including dead band adjustment and audible indication of the elevation.
37 citations
TL;DR: This study confirms that the vibration transmissibility generally decreased with the increase in distance from the hand and it varied with the vibration direction, and can help understand the syndrome and help develop improved frequency weightings for assessing the risk of the exposure for developing various components of the syndrome.
37 citations