Demonstration of Pressure Wave Observation by Acousto-Optic Sensing Using a Self-Mixing Interferometer

Maqueda, Sébastien; Perchoux, Julien; Tronche, Clément; Imas, J. J.; Genetier, Marc; Lavayssière, Maylis; Barbarin, Y.

doi:10.3390/s23073720

Cited by 3 publications

(7 citation statements)

References 25 publications

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“…The slope of the linear regression between P SMI and P mic is 1.061 (0.51 dB) and the maximal difference between P mic and P SMI is 2.2 dB. This good agreement confirms the suitability of the SMI for acoustic measurements in waveguides (from 20 to 860 Pa and between 614 and 17,900 Hz in the reported case), using the calibration method presented in Section 3 and the simple model for L AO in Equation (19).…”

Section: Smi and Microphonic Measurements Comparisonsupporting

confidence: 74%

“…To compensate for length variations in L ac , L V is estimated from the accelerometer signals after two temporal integrations and subtracted from L ac . Finally, the acoustic pressure in the waveguide denoted p ′ SMI , is computed using L AO and Equation (19). This protocol is applied in the following section.…”

Section: (B)mentioning

confidence: 99%

“…The latter can be estimated by measuring the LD power using the embedded PD, the current of which is converted into voltage to form the SMI signal. Thus, it is possible to use the SMI both as a vibrometer [ 3 , 15 , 16 , 17 ] or as an acousto-optical sensor [ 12 , 13 , 14 , 18 , 19 ].…”

Section: Introductionmentioning

confidence: 99%

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Self-Mixing Interferometer for Acoustic Measurements through Vibrometric Calibration

Chanu-Rigaldies,

Lecomte,

Ollivier

et al. 2024

Sensors

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The Self-Mixing Interformeter (SMI) is a self-aligned optical interferometer which has been used for acoustic wave sensing in air through the acousto-optic effect. This paper presents how to use a SMI for the measurement of Sound Pressure Level (SPL) in acoustic waveguides. To achieve this, the SMI is first calibrated in situ as a vibrometer. The optical feedback parameters C and α in the strong feedback regime (C≥4.6) are estimated from the SMI vibrometric signals and by the solving of non-linear equations governing the SMI behaviour. The calibration method is validated on synthetic SMI signals simulated from SMI governing equations for C ranging from 5 to 20 and α ranging from 4 to 10. Knowing C and α, the SMI is then used as an acoustic pressure sensor. The SPLs obtained using the SMI are compared with a reference microphone, and a maximal deviation of 2.2 dB is obtained for plane waves of amplitudes ranging from 20 to 860 Pa and frequencies from 614 to 17,900 Hz. The SPL measurements are carried out for C values ranging from 7.1 to 21.5.

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Section: Smi and Microphonic Measurements Comparisonsupporting

confidence: 74%

Section: (B)mentioning

confidence: 99%

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Self-Mixing Interferometer for Acoustic Measurements through Vibrometric Calibration

Chanu-Rigaldies,

Lecomte,

Ollivier

et al. 2024

Sensors

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“…We recently demonstrated its capability to measure air overpressure in a shock tube utilizing the acousto-optic effect [9].…”

Section: Smi Principle With Fringe Counting Signal Processingmentioning

confidence: 99%

“…In our field of detonic applications, δn is then converted into an overpressure ∆𝑃 with the help of an acouto-optic model described in [9]. The wavelength used is 1550 nm in order to have a Class 1 laser system with laser optical power inferior to 10 mW.…”

Section: Smi Principle With Fringe Counting Signal Processingmentioning

confidence: 99%

Overpressure sensing through acousto-optics: a comparison between a self-mixing interferometer and an all-fiber Michelson interferometer

Maqueda,

Perchoux,

Tronche

et al. 2024

Optical Waveguide and Laser Sensors III

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Recent studies have shown that a compact self-mixing interferometer can be used for the characterization of shock waves. It measures dynamically (> 10 MHz) the changes in the refractive index induced by the shock wave. Associated to an appropriate acousto-optic model, the pressure profile is computed with a 34 mbar resolution. In the present work, we compare shock wave induced refractive index variations measurements by another method using a Michelson-type fiberoptic interferometer with phase analysis that has been developed for Photonic Doppler Velocimetry applications. The output signals of this system are processed in triature, which consists in analyzing the phase shift between the three interferometric signals. This bulkier system provides, in theory, a better resolution than the self-mixing interferometry sensing scheme. In the present paper, we compare these two optical methods to measure a shock wave pressure through experiments that were carried out with an open shock tube instrumented with commercial, bandwidth limited, pressure sensors. This configuration creates a spherical shock wave similar to those observed during on-field experiments with explosives. We describe the two measurement systems and the experimental setup design used for overpressure characterizations. Both sensing approaches have been carried out in the same experimental conditions and with shock wave pressure peak amplitudes of a few bars. We detail the two types of signal processing and we discuss the results obtained with the two optical methods, which are also compared to a piezoelectric reference sensor.

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Imaging elastic waves in solids: how to use laser feedback interferometry to visualize them

Bertling,

Veidt,

Perchoux

et al. 2023

Opt. Express

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The use of ultrasonic elastic waves is a well established technique for non-destructive testing of materials and structures, in particular to exploit the interaction of waves with structural features to detect and characterize defects. Optical methods offer the advantage of visualising the distribution of elastic waves in a non-contact manner without disturbing the elastic wave. In this work we propose a laser feedback interferometry (LFI) based system as a cost effective, non-contact, alternative to a well established laser Doppler vibrometer technique. We demonstrate the visualization of the elastic waves, using an example of an elastic wave propagating through a prismatic acrylic rod. We show that the ultra-compact and simple implementation of LFI enables accurate visualization of the elastic waves in solids, and opens the pathway to a range of new opportunities in ultrasonic non-destructive testing and evaluation.

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Demonstration of Pressure Wave Observation by Acousto-Optic Sensing Using a Self-Mixing Interferometer

Cited by 3 publications

References 25 publications

Self-Mixing Interferometer for Acoustic Measurements through Vibrometric Calibration

Self-Mixing Interferometer for Acoustic Measurements through Vibrometric Calibration

Overpressure sensing through acousto-optics: a comparison between a self-mixing interferometer and an all-fiber Michelson interferometer

Imaging elastic waves in solids: how to use laser feedback interferometry to visualize them

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