scholarly journals Design of the Ship-Borne Multi-Wavelength Polarization Ocean Lidar System and Measurement of Seawater Optical Properties

2020 ◽  
Vol 237 ◽  
pp. 07007
Author(s):  
Qi Liu ◽  
Bingyi Liu ◽  
Songhua Wu ◽  
Jintao Liu ◽  
Kailin Zhang ◽  
...  
Keyword(s):  
Optical Properties ◽  
Attenuation Coefficient ◽  
Jiaozhou Bay ◽  
Field Of View ◽  
Optical Parameters ◽  
Ocean Optics ◽  
Lidar System ◽  
Sea Trial ◽  
Vertical Distributions ◽  
Multi Wavelength

A ship-borne multi-wavelength polarization ocean lidar system LOOP (Lidar for Ocean Optics Profiler) is introduced in detail, aiming to obtain high-precision vertical profiles of seawater optical characteristics. Based on Monte-Carlo simulation, the receiving telescope is designed with a variable field of view, producing system attenuation coefficient (Klidar) approximating the optical parameters of seawater under a different field of view and water body conditions. At first, a sea trial was conducted in Jiaozhou Bay, and the measured diffuse attenuation coefficient (Kd) of seawater was 0.3m−1, being in good agreement compared with the results measured by field instrument TriOS. Then a field campaign was organized in the South China Sea. The measurement of the seawater diffuse attenuation (Kd) was 0.035m−1. These results support the prospects that lidar, as an effective tool supplement to traditional passive ocean color remote sensing, can provide the vertical distributions of optical properties in the upper ocean.

Optical properties of mixed aerosol layers over Japan derived with multi-wavelength Mie–Raman lidar system

2017 ◽  
Vol 188 ◽  
pp. 20-27 ◽  
Author(s):  
Yukari Hara ◽  
Tomoaki Nishizawa ◽  
Nobuo Sugimoto ◽  
Ichiro Matsui ◽  
Xiaole Pan ◽  
...  
Keyword(s):  
Optical Properties ◽  
Raman Lidar ◽  
Lidar System ◽  
Multi Wavelength

Dual pure-rotational Raman channel design and implementation in a multiwavelength lidar system for the monitoring of aerosol optical properties.

2021 ◽  
Author(s):  
José-Alex Zenteno-Hernández
Keyword(s):  
Optical Properties ◽  
Cross Sections ◽  
State Of The Art ◽  
Aerosol Optical Properties ◽  
Lidar System ◽  
Separation Unit ◽  
Interference Filters ◽  
Multi Wavelength ◽  
Expected Signal

<p>Pure-rotational Raman (PRR) scattering has proven to be an efficient technique for the determination of atmospheric aerosol optical properties for lidar applications. We present the implementation of a UV-PRR and the design of a VIS-PRR in the EARLINET/UPC multi-wavelength lidar system (Barcelona, Spain). State-of-the-art computations of N<sub>2</sub> and O<sub>2</sub> differential backscatter cross-sections weighted by the optical losses inside the optical separation unit of the system allow for the theoretical estimation of the expected signal-to-noise ratios (SNR) in both UV and VIS channels. By means of customized optical interference filters UV-PRR signals from atmospheric N<sub>2</sub> and O<sub>2</sub> were detected and compared to the classical vibro-rotational Raman signals. UV-PRR detected signals have shown to possess high SNR and relative uncertainty levels lower than a tolerable 15% for daytime and nighttime measurements. The theoretical analysis of the VIS-PRR channel augurs improvements similar to those observed with the UV-PRR channel.</p>

Airborne lidar system with variable-field-of-view receiver for water optical properties measurement

2003 ◽  
Author(s):  
Viktor I. Feygels ◽  
Yuri I. Kopilevich ◽  
Alexey I. Surkov ◽  
James K. Yungel ◽  
Michael J. Behrenfeld
Keyword(s):  
Optical Properties ◽  
Airborne Lidar ◽  
Field Of View ◽  
Lidar System ◽  
Variable Field

Determination of Vertical Distributions of Aerosol Optical Parameters by Use of Multi-Wavelength Lidar Data

2003 ◽  
Vol 42 (Part 1, No. 2A) ◽  
pp. 686-694 ◽  
Author(s):  
Masanori Yabuki ◽  
Hiroaki Kuze ◽  
Hideki Kinjo ◽  
Nobuo Takeuchi
Keyword(s):  
Lidar Data ◽  
Optical Parameters ◽  
Vertical Distributions ◽  
Multi Wavelength

scholarly journals Synthesis of PVA/CeO2 Based Nanocomposites with Tuned Refractive Index and Reduced Absorption Edge: Structural and Optical Studies

Materials ◽  
2021 ◽  
Vol 14 (6) ◽  
pp. 1570
Author(s):  
Shujahadeen B. Aziz ◽  
Elham M. A. Dannoun ◽  
Dana A. Tahir ◽  
Sarkawt A. Hussen ◽  
Rebar T. Abdulwahid ◽  
...  
Keyword(s):  
Refractive Index ◽  
Optical Properties ◽  
Absorption Edge ◽  
Ceo2 Nanoparticles ◽  
Poly Vinyl Alcohol ◽  
Optical Parameters ◽  
Single Oscillator Model ◽  
Vis Spectroscopy ◽  
The Impact ◽  
Host Polymer

In the current study, polymer nanocomposites (NCPs) based on poly (vinyl alcohol) (PVA) with altered refractive index and absorption edge were synthesized by means of a solution cast technique. The characterization techniques of UV–Vis spectroscopy and XRD were used to inspect the structural and optical properties of the prepared films. The XRD patterns of the doped samples have shown clear amendments in the structural properties of the PVA host polymer. Various optical parameters were studied to get more insights about the influence of CeO2 on optical properties of PVA. On the insertion of CeO2 nanoparticles (NPs) into the PVA matrix, the absorption edge was found to move to reduced photon energy sides. It was concluded that the CeO2 nanoparticles can be used to tune the refractive index (n) of the host polymer, and it reached up to 1.93 for 7 wt.% of CeO2 content. A detailed study of the bandgap (BG) was conducted using two approaches. The outcomes have confirmed the impact of the nanofiller on the BG reduction of the host polymer. The results of the optical BG study highlighted that it is crucial to address the ɛ” parameter during the BG analysis, and it is considered as a useful tool to specify the type of electronic transitions. Finally, the dispersion region of n is conferred in terms of the Wemple–DiDomenico single oscillator model.

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