One-wavelength two-component laser Doppler velocimeter system for surface displacement monitoring

Garcia-Vizcaino, David; Dios, Federico; Recolons, Jaume; Rodrı́guez, Alejandro; Comerón, Adolfo

doi:10.1117/1.3050421

Cited by 8 publications

(5 citation statements)

References 16 publications

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“…Synchronization is still needed among detectors. Recently some simultaneous multipoint measurements [ 17 , 71 , 72 ] using one laser source and one detector have been reported. These techniques use at least two acousto-optic devices to generate various frequency shifts at spatially-separated points and resolve the signals in frequency domain.…”

Section: Detector-based Idmmentioning

confidence: 99%

Interferometric Dynamic Measurement: Techniques Based on High-Speed Imaging or a Single Photodetector

Pedrini

2014

The Scientific World Journal

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In recent years, optical interferometry-based techniques have been widely used to perform noncontact measurement of dynamic deformation in different industrial areas. In these applications, various physical quantities need to be measured in any instant and the Nyquist sampling theorem has to be satisfied along the time axis on each measurement point. Two types of techniques were developed for such measurements: one is based on high-speed cameras and the other uses a single photodetector. The limitation of the measurement range along the time axis in camera-based technology is mainly due to the low capturing rate, while the photodetector-based technology can only do the measurement on a single point. In this paper, several aspects of these two technologies are discussed. For the camera-based interferometry, the discussion includes the introduction of the carrier, the processing of the recorded images, the phase extraction algorithms in various domains, and how to increase the temporal measurement range by using multiwavelength techniques. For the detector-based interferometry, the discussion mainly focuses on the single-point and multipoint laser Doppler vibrometers and their applications for measurement under extreme conditions. The results show the effort done by researchers for the improvement of the measurement capabilities using interferometry-based techniques to cover the requirements needed for the industrial applications.

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Section: Detector-based Idmmentioning

confidence: 99%

Interferometric Dynamic Measurement: Techniques Based on High-Speed Imaging or a Single Photodetector

Pedrini

2014

The Scientific World Journal

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“…Based on the Doppler effect, many laser Doppler interferometric approaches have been developed, such as Laser Doppler Vibrometer (LDV) [6] , velocimeter [7] and VISAR (Velocity Interferometer System for Any Reflector) [8] , etc. Although LDI gains above mentioned merits of owning a very high temporal sampling rate and requiring less on lighting condition, its primary demerit that normally only a point-wise measurement can be offered, restricts its use in practice.…”

Section: Introductionmentioning

confidence: 99%

Dynamic measurement via laser interferometry: crystal growth monitoring and modal parameter analysis

Yang

Fu²,

Zhao

et al. 2015

SPIE Proceedings

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“…However, these multibeam versions are normally a combination of several sets of single-point vibrometer [8], or use multiple detectors or detector array [3][4][6][7][8][9], which still need synchronization. Recently some simultaneous multi-point measurements [10][11][12] using one laser source and one detector have been reported in the akin technique ------Laser Doppler velocimetry, which has widely been used in experimental fluid mechanics area for flow measurement. These techniques use at least two acousto-optic devices to generate various frequency shifts at spatially-separated points, and resolve the signals in frequency domain.…”

Section: Introductionmentioning

confidence: 99%

Multi-beam Laser Doppler Vibrometer with fiber sensing head

Phua

Guo

et al. 2012

AIP Conference Proceedings

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Laser Doppler vibrometry (LDV) is a well known technique to measure the motions, vibrations and mode shapes of structures and machine components. Photodetector-based LDV can only offer a point-wise measurement. However, it is possible to scan the laser beam to build up a vibrometric image. These scanning laser Doppler vibrometers (SLDV) assume that the measurement conditions remain invariant while multiple and identical, sequential measurements are performed. This assumption makes SLDVs impractical to do measurement on transient events. In this paper, we introduce a new method of generating multiple laser beams with different frequency shifts. The laser beams are projected on different points, and the reflected beams interfere with a common reference beam. The cross-talk among object beams can be bypassed with a proper selection of frequency shifts. A simultaneous vibration measurement on multiple points is realized using a single photodetector. Based on the proposed spatial-encoding technology, a self-synchronized prototype of fiber-based multipoint laser Doppler vibrometer at 1550nm wavelength is developed. An addition red pilot laser is used for aiming purpose. It has the flexibility to measure the vibration of different points on various surfaces. The prototype is used to measure the vibration of different points on a cantilever beam and a plate. The measured results match well with simulation results using finite element method (FEM).

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One-wavelength two-component laser Doppler velocimeter system for surface displacement monitoring

Cited by 8 publications

References 16 publications

Interferometric Dynamic Measurement: Techniques Based on High-Speed Imaging or a Single Photodetector

Interferometric Dynamic Measurement: Techniques Based on High-Speed Imaging or a Single Photodetector

Dynamic measurement via laser interferometry: crystal growth monitoring and modal parameter analysis

Multi-beam Laser Doppler Vibrometer with fiber sensing head

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