Comparison of velocimeter and coherent lidar measurements for building frequency assessment

Guéguen, Philippe; Jolivet, V.; Michel, Clotaire; Schveitzer, Anne-Sophie

doi:10.1007/s10518-009-9137-2

Cited by 25 publications

(9 citation statements)

References 19 publications

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“…Since Omori at the beginning of the 20th century 15, there has been an abundance of scientific literature on the interests of such experiments, which have been widely used by civil engineering, engineering seismology and earthquake engineering communities to monitor structures 16, to calibrate the elastic properties used by modellers 17–19, to compare building response under weak and strong motions 20–24 and to estimate seismic damage after strong earthquakes 16, 25, 26. Since the first ambient vibration experiments, efforts have been made on signal processing methods, known as modal analysis methods, as well as on the development of acquisition systems to improve recording quality 27, 28.…”

Section: Introductionmentioning

confidence: 99%

Seismic vulnerability assessment to slight damage based on experimental modal parameters

Michel

Guéguen

Causse

2011

Earthq Engng Struct Dyn

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International audienceThe aim of this paper is to adjust behaviour models for each class of structure for vulnerability assessment by using ambient vibration. A simple model based on frequencies, mode shapes and damping, taken from ambient vibrations, allows computation of the response of the structures and comparison of inter-storey drifts with the limits found in the literature for the slight damage grade, considered here as the limit of elastic behaviour. Two complete methodologies for building fragility curves are proposed: (1) using a multi-degree of freedom system including higher modes and full seismic ground motion, (2) using a single-degree of freedom model considering the fundamental mode f0 of the structure and ground motion displacement response spectra SD(f0). These two methods were applied to the city of Grenoble, where 60 buildings were studied. Fragility curves for slight damage were derived for the various masonry and reinforced concrete classes of buildings. A site-specific earthquake scenario, taking into account local site conditions, was considered, corresponding to an ML=5.5 earthquake at a distance of 15km. The results show the benefits of using experimental models to reduce variability of the slight damage fragility curve. Moreover, by introducing the experimental modal model of the buildings, it is possible to improve seismic risk assessment at an overall scale (the city) or a local scale (the building) for the first damage grade (slight damage). This level of damage, of great interest for moderate seismic prone regions, may contribute to the seismic loss assessment

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Section: Introductionmentioning

confidence: 99%

Seismic vulnerability assessment to slight damage based on experimental modal parameters

Michel

Guéguen

Causse

2011

Earthq Engng Struct Dyn

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“…Long range laser Doppler vibrometry has been successfully applied to an increasing number of situations where the interest is to determine the vibration characteristics of an inaccessible target. These applications range from the structural assessment of potentially damaged buildings [1] to target identification for military purpose [2,3]. Although vibration frequencies and velocities are very different in magnitude, in both cases the aim is to identify the modal frequencies of the target.…”

Section: Introductionmentioning

confidence: 99%

Advanced signal processing methods for pulsed laser vibrometry

Totems¹,

Jolivet²,

Ovarlez³

et al. 2010

Appl. Opt.

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Although pulsed coherent laser radar vibrometry has been introduced as an improvement over its Continuous Wave (CW) counterpart, it remains very sensitive to decorrelation noises such as speckle, and other disturbances of the measurement. Taking advantage of more polyvalent poly-pulse waveforms, we address the issue with advanced signal processing. We have conducted what we believe is the first extensive comparison of processing techniques considering CW, pulse-pair and poly-pulse emissions. In this framework, we introduce a computationally efficient maximum likelihood estimator and test signal tracking on pseudo time-frequency representations, which respectively help deal with speckle noise and fading of the signal, in harsh noise conditions. Our comparison on simulated signals is validated on a 1.55µm all-fiber vibrometer experiment, with an apparatus simulating vibration and strong speckle noise. Results show the advantage of estimators taking into account actual noise statistics, and call for a wider use of timefrequency representations to track the vibration modulated signal. OCIS codes: 280.0280, 280.3340, 120.7280. 2

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“…Compared to the scanning LDVs are widely used for non-contact displacement or velocity measurements that do not require an absolute distance from the target. One major field that uses LDV is structural health monitoring and modal testing [8,9] for various structures, e.g., bridges [10][11][12], buildings [13][14][15], wind turbines [16,17], airplanes [18], and PCBs [19]. Another important focus is the biomedical field, where LDVs are used in otology [20], cardiology [21], and photo-acoustic imaging [22].…”

Section: Background and Working Principle Of Ldvmentioning

confidence: 99%

Miniaturization of Laser Doppler Vibrometers—A Review

Dieussaert

Baets

2022

Sensors

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Laser Doppler vibrometry (LDV) is a non-contact vibration measurement technique based on the Doppler effect of the reflected laser beam. Thanks to its feature of high resolution and flexibility, LDV has been used in many different fields today. The miniaturization of the LDV systems is one important development direction for the current LDV systems that can enable many new applications. In this paper, we will review the state-of-the-art method on LDV miniaturization. Systems based on three miniaturization techniques will be discussed: photonic integrated circuit (PIC), self-mixing, and micro-electrochemical systems (MEMS). We will explain the basics of these techniques and summarize the reported miniaturized LDV systems. The advantages and disadvantages of these techniques will also be compared and discussed.

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Comparison of velocimeter and coherent lidar measurements for building frequency assessment

Cited by 25 publications

References 19 publications

Seismic vulnerability assessment to slight damage based on experimental modal parameters

Seismic vulnerability assessment to slight damage based on experimental modal parameters

Advanced signal processing methods for pulsed laser vibrometry

Miniaturization of Laser Doppler Vibrometers—A Review

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