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, the authors describe a new and highly effective optical frequency discriminator and laser stabilization system based on signals reflected from a stable Fabry-Perot reference interferometer.
Abstract: We describe a new and highly effective optical frequency discriminator and laser stabilization system based on signals reflected from a stable Fabry-Perot reference interferometer. High sensitivity for detection of resonance information is achieved by optical heterodyne detection with sidebands produced by rf phase modulation. Physical, optical, and electronic aspects of this discriminator/laser frequency stabilization system are considered in detail. We show that a high-speed domain exists in which the system responds to the phase (rather than frequency) change of the laser; thus with suitable design the servo loop bandwidth is not limited by the cavity response time. We report diagnostic experiments in which a dye laser and gas laser were independently locked to one stable cavity. Because of the precautions employed, the observed sub-100 Hz beat line width shows that the lasers were this stable. Applications of this system of laser stabilization include precision laser spectroscopy and interferometric gravity-wave detectors.
3,393 citations
Book•
01 Jan 1976TL;DR: In this paper, the Doppler Reference Record (DRR) was used for anemometrie a : laser a : anemometry a: laser a: anemometric a: a : a : light anemometer b : laser A : laser
Abstract: Keywords: anemometrie a : laser ; anemometrie ; optique ; laser : Doppler Reference Record created on 2005-11-18, modified on 2016-08-08
850 citations
Book•
12 Mar 2014
TL;DR: In this article, the basic measuring principles of light propagation and light scattering from small particles are discussed, along with the fundamental principles of data processing and data generation in laser and phase doppler systems.
Abstract: Preface.- Introduction.- Basic Measuring Principles.- Fundamentals of Light Propagation and Optics.- Light Scattering from Small Particles.- Signal Generation in Laser Doppler and Phase Doppler Systems.- Signal Detection, Processing and Validation.- Laser Doppler Systems.- Phase Doppler Systems.- Further Particle Sizing Methods Based on the Laser Doppler Technique.- Fundamentals of Data Processing.- Processing of Laser Doppler Data.- Processing of Phase Doppler Data.- Choice of Particles and Particle Generation.- System Design Considerations.- Appendix.- Bibliography.- Index.
718 citations
TL;DR: In this paper, a distributed vibration sensor was developed by using heterodyne detection and signal processing of moving averaging and moving differential for the phase optical time domain reflectometry system for detecting pencil break vibration.
Abstract: We developed a distributed vibration sensor by using heterodyne detection and signal processing of moving averaging and moving differential for the phase optical time domain reflectometry system. The broadband acoustic frequency components generated by pencil-break vibration have been measured and identified in location by our distributed vibration sensor for the first time. Pencil break measurement is a standard technique to emulate the acoustic emission of cracks in concrete or steel bridges for early crack identification. The spatial resolution is 5m and the highest frequency response is 1 kHz, which is limited by the trigger frequency of data acquisition card. This new sensing system can be used for vibration detection of health monitoring of various civil structures as well as any dynamic monitoring requirement.
576 citations