532-nm triature Photonic Doppler Velocimetry

Blanc, Gaël Le; Bergey, Sébastien; Vich, Jérémy; d’Almeida, Thierry; Roudot, Marie; Luc, J.; Barbarin, Y.

doi:10.1117/12.2616569

Cited by 4 publications

(7 citation statements)

References 13 publications

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“…The velocity profiles obtained from the SM 1550-nm, SM 532-nm and MM 532-nm systems were very close. The main benefit of working at 532 nm is to achieve 3 times more interference fringes to facilitate signal processing by STFT [7] and this was again confirmed. The first highlight of this experiment is that we measured interference fringes with a root mean square value of 190 mV from the MM system and only 37 mV from the SM system.…”

Section: High-speed Comparative Experiments At 532 Nmmentioning

confidence: 59%

“…This time, the top side was instrumented with standard SM 1550-nm PDV channels and the bottom electrode had only two focusers (working distance: 20 mm; SM and MM) designed for 532 nm. The first probe was connected to our SM triature 532-nm PDV system [7] and the second one to the MM 532-nm PDV system presented in the previous section. No special probe holder was used, so focuser alignment was performed manually.…”

Section: High-speed Comparative Experiments At 532 Nmmentioning

confidence: 99%

“…Telecom SM fibers offer excellent interference fringes and very low optical losses (0.18 dB/km). PDV systems have also been validated at 532 nm [5][6][7] in order to increase by a factor 3 the temporal and velocity resolutions. SM fibers for 532 nm operations have a core diameter of typically 3.5 µm, a numerical aperture of approximately 0.12 and optical losses of 0.03 dB/m.…”

Section: Introductionmentioning

confidence: 99%

“…endcaps) are necessary. When the focuser or collimator is very well-aligned, excellent interference fringes are obtained at 532 nm [6,7]. This alignment is much more difficult to achieve than at 1550 nm.…”

Section: Introductionmentioning

confidence: 99%

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Photonic Doppler velocimetry with 62.5 µm graded index multimode fiber at 1550 and 532 nm

Barbarin

Lefrère²,

Bourcier³

et al. 2023

Photonic Instrumentation Engineering X

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Photonic Doppler Velocimetry (PDV) systems measure velocities in shock physics experiments on novel materials. In many experiments, diffusive materials limit the amount of Doppler signal collected, which degrades the measurement. Increasing the laser power comes with a cost when many channels are supplied at the same time and could damage some sensitive surfaces. The use of a multimode fiber with a 62.5 µm core diameter in the collimator or focuser brings more signal into the interferometer but, on the other hand, the multimode behavior of the fiber reduces interference contrast. PDV systems with 62.5 µm multimode fiber were tested at 1550 and 532 nm on a test-bench at low velocities. The interference amplitudes are discussed according to tilt angle and for different surface qualities. The trends differed with wavelength. A multimode system was also tested under real conditions during a ramp compression experiment with velocities greater than 100 m/s. Practically, the use of multimode fibers greatly facilitates probe alignment, especially at 532 nm. Furthermore, 532-nm singlemode fiber are rapidly limited in terms of their optical power. For the two wavelengths tested, the high-speed measurements show clear interference fringes with at least the same amplitude level as with singlemode PDV systems. The benefits of multimode PDV systems appear clearer for highly diffusive surfaces and when probe alignment cannot be guaranteed. At 532 nm, better results are expected using fibers with a core diameter in the range of 20 µm if the optical components become available.

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Section: High-speed Comparative Experiments At 532 Nmmentioning

confidence: 59%

Section: High-speed Comparative Experiments At 532 Nmmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Photonic Doppler velocimetry with 62.5 µm graded index multimode fiber at 1550 and 532 nm

Barbarin

Lefrère²,

Bourcier³

et al. 2023

Photonic Instrumentation Engineering X

Self Cite

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show abstract

“…Shorter wavelength systems are more sensitive to motion, e.g. a 532 nm PDV [18] is nearly 3× as sensitive as a 1550 nm PDV, yielding 3.8 MHz of Doppler shift per m s −1 instead of 1.3 MHz. However, the maximum velocity range of such a system would be reduced to 266 m s −1 for 1 GHz bandwidth, and many of the technology benefits mentioned in the previous section are lost.…”

Section: Measuring Doppler Shiftmentioning

confidence: 99%

Technology and times scales in Photonic Doppler Velocimetry (PDV)

Dolan

2024

Meas. Sci. Technol.

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Photonic Doppler Velocimetry (PDV) is a fiber-based measurement amenable to a wide range of experimental conditions. Interference between two optical signals---one Doppler shifted and the other not---is the essential principle in these measurements. A confluence of commercial technologies, largely driven by the telecommunication industry, make PDV particularly convenient at near-infrared wavelengths. This discussion considers how measurement time scales of interest relate to the design, operation, and analysis of a PDV measurement, starting from the steady state through nanosecond resolution. Benefits and outstanding challenges of PDV are summarized, with comparisons to related diagnostics.

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Multi-longitudinal mode 532 nm photonic Doppler velocimetry for shock experiments

Wang,

Liu,

et al. 2024

Review of Scientific Instruments

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A novel multi-longitudinal mode 532 nm photonic Doppler velocimetry (PDV) was proposed to solve the problem of high bandwidth requirements in shock experiments with velocities up to km/s. Compared to the conventional PDV system operating at 1550 nm, the utilization of a shorter wavelength of 532 nm enables nearly three times the velocity resolution. However, it also leads to a threefold increase in the Doppler frequency shift for a given velocity. To mitigate the bandwidth constraints, a multi-longitudinal mode laser is employed to downconvert the signal, effectively reducing the bandwidth requirements. The efficacy of this method is validated through theoretical analysis and experimental investigations on detonation shock scenarios. Furthermore, this approach eliminates the necessity for modulators, frequency shifters, and other devices, facilitating its applicability to non-communication bands.

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532-nm triature Photonic Doppler Velocimetry

Cited by 4 publications

References 13 publications

Photonic Doppler velocimetry with 62.5 µm graded index multimode fiber at 1550 and 532 nm

Photonic Doppler velocimetry with 62.5 µm graded index multimode fiber at 1550 and 532 nm

Technology and times scales in Photonic Doppler Velocimetry (PDV)

Multi-longitudinal mode 532 nm photonic Doppler velocimetry for shock experiments

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