Brillouin shift and linewidth measurement based on double-edge detection technology in seawater

Liang, Kun; Zhang, R.; Sun, Qian; Xu, Yiming; Wu, Hong Mei; Zhang, Peng; Zhang, Bo

doi:10.1007/s00340-020-07509-1

Cited by 8 publications

(3 citation statements)

References 24 publications

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“…Its principle is to measure a small frequency shift based on measuring a large intensity variation, and the Brillouin shift can be obtained from the normalized variation of the intensity. The accuracy of the water temperature measured by the Brillouin shift in this technique can reach 0.5 °C(averaging 1000 laser shots) 37 . However, as it obtains only the signal intensity rather than the spectrum, considerable information will be lost.…”

Section: Introductionmentioning

confidence: 89%

Brillouin scattering spectrum for liquid detection and applications in oceanography

Wang¹,

Zhang²,

Zheng³

et al. 2023

OEA

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The Brillouin scattering spectrum has been used to investigate the properties of a liquid medium. Here, we propose an improved method based on the double-edge technique to obtain the Brillouin spectrum of a liquid. We calculated the transmission ratios and deduced the Brillouin shift and linewidth to construct the Brillouin spectrum by extracting the Brillouin edge signal through filtered double-edge data. We built a detection system to test the performance of this method and measured the Brillouin spectrum for distilled water at different temperatures and compared it with the theoretical prediction. The observed difference between the experimental and theoretical values for Brillouin shift and linewidth is less than 4.3 MHz and 3.2 MHz, respectively. Moreover, based on the double-edge technique, the accuracy of the extracted temperatures and salinity is approximately 0.1 °C and 0.5%, respectively, indicating significant potential for application in water detection and oceanography.

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Section: Introductionmentioning

confidence: 89%

Brillouin scattering spectrum for liquid detection and applications in oceanography

Wang¹,

Zhang²,

Zheng³

et al. 2023

OEA

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“…The bubble scale is large, generally below 1000 µm, mainly concentrated in 100~500 µm, and the bubble number density can reach 10 6 ~3 × 10 8 m −3 . The larger the bubble scale, the faster the bubble floats, and the larger the bubble scale, the lower the bubble number density [11][12][13][14]. Bubbles in the wake field of long-range ships are mainly affected by their buoyancy.…”

Section: Bubble Distribution Characteristics and Analysis Of Ship Wakementioning

confidence: 99%

Research on Laser Dual-Mode Fusion Detection Method of Ship Wake Bubbles

Zong,

Zhang,

Duan

et al. 2024

Applied Sciences

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Addressing the issues of weak echo signals and strong background interference in the laser detection of ships’ wakes, an analysis of the laser backscatter detection characteristics of ships’ wakes has been conducted. Based on the Monte Carlo method, a simulation model for the dual-mode fusion detection of ship wake bubbles using laser technology was constructed under different target characteristics. A dual-mode fusion detection system for ships’ wakes was designed, and an indoor experimental platform for the dual-mode fusion detection of ship wake bubbles using laser technology was established. To address problems such as a wide range of echo signal intensity changes, severe signal fluctuations, low resolution, poor image contrast, and blurred target edge information, an algorithm based on multi-timescale hierarchical fusion signal processing and temporal difference accumulation image processing was proposed. Verification experiments for ship wake detection were conducted, which revealed that the dual-mode fusion detection method for ship wake bubbles using laser technology can effectively enhance the detection signal-to-background ratio and counter the maneuvering evasion of underwater weapons by ships. It achieved high sensitivity, large dynamic range, high resolution, and a wide field of view detection and real-time signal processing of ship wake bubble targets of different magnitudes against a strong reverberation background. The effectiveness of the dual-mode fusion detection mode was validated, providing theoretical support for the overall system design and parameter settings.

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“…Considering the requirements of real-time spectrum measurement, spectral integrity, and continuity, Kun et al [ 30 , 31 ] proposed a spectral measurement method based on a dual-edge etalon combined with a photomultiplier tube (PMT). In this method, the energies of two local characteristic narrowband spectra are measured through two edge filters.…”

Section: Introductionmentioning

confidence: 99%

Remote Sensing of Seawater Temperature and Salinity Profiles by the Brillouin Lidar Based on a Fizeau Interferometer and Multichannel Photomultiplier Tube

Wang

Chen

et al. 2022

Sensors

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Brillouin spectroscopy is a powerful tool to measure the water temperature and salinity profiles of seawater. Considering the insufficiency of the current spectral measurement methods in real-time, spectral integrity, continuity, and stability, we developed a new lidar system for spectrum measurement on an airborne platform that is based on a Fizeau interferometer and multichannel photomultiplier tube. In this approach, the lidar system uses time-of-flight information to measure the depth and relies on Brillouin spectroscopy as the temperature and salinity indicator. In this study, the system parameters were first optimized and analyzed. Based on the analysis results, the performance of the system in terms of detection depth and accuracy was evaluated. The results showed that this method has strong anti-interference ability, and under a temperature measurement accuracy of 0.5 °C and a salinity measurement accuracy of 1‰, the effective detection depth exceeds 40.51 m. Therefore, the proposed method performs well and will be a good choice for achieving Brillouin lidar application in seawater remote sensing.

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Brillouin shift and linewidth measurement based on double-edge detection technology in seawater

Cited by 8 publications

References 24 publications

Brillouin scattering spectrum for liquid detection and applications in oceanography

Brillouin scattering spectrum for liquid detection and applications in oceanography

Research on Laser Dual-Mode Fusion Detection Method of Ship Wake Bubbles

Remote Sensing of Seawater Temperature and Salinity Profiles by the Brillouin Lidar Based on a Fizeau Interferometer and Multichannel Photomultiplier Tube

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