研究目的
Investigating the thickness measurement and three-dimensional structure imaging of oil slick on water by Optical Coherence Tomography.
研究成果
SD-OCT technique was able to directly observe 3-D volumetric structure, surficial characteristic and axial thickness of oil slick. The reconstructed resolution of axial thickness in petroleum slick and diesel slick was ~2.2 μm and ~2.6 μm, respectively. The reconstructed dataset image based on single-pixel optical intensity could observe axial thickness of oil slick with higher resolution.
研究不足
The resolution in the OCT reconstruction dataset image is decided by each pixel unit size, meaning the two lines will not be distinguishable when reconstructing thickness is lower than the single pixel size (~2.2 μm in axial, ~2.6 μm in lateral).
1：Experimental Design and Method Selection:
A high resolution SD-OCT system with the center wavelength of 1300 nm was used for detecting the quantitative thickness of oil slick on still water surface with a fixed volume, and measuring the 3-D structure of oil slick and the two-dimensional depth image in different locations of oil slick.
2：Sample Selection and Data Sources:
Diesel and petroleum floated on the surface of seawater in a glass cell, respectively, were used as the samples in experiments.
3：List of Experimental Equipment and Materials:
A continuous-wave laser with a center wavelength of 1300 nm and output power of 10 mW was used as the light source. The system included a fiber collimator, a non-polarizing beam-splitter, achromatic lenses, a galvanometer scanner, a gold-coated mirror, a directional coupler, a spectrometer, a diffraction grating, and a linear CCD camera.
4：Experimental Procedures and Operational Workflow:
The samples were placed outdoor for 15 minutes to make the oil slick fully diffusing on water surface. Three special locations were selected for imaging to obtain the axial thickness and surface characteristic of oil slick.
5：Data Analysis Methods:
A single-pixel optical intensity reconstruction method was used to reconstruct the dataset image of axial thickness of oil slick.
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continuous-wave laser
Used as the light source in the SD-OCT system.
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fiber collimator
Collimates the output laser beam.
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non-polarizing beam-splitter
Divides the laser beam into reference arm and sample arm.
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achromatic lens
Focuses the laser beam in the sample arm and reference arm.
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galvanometer scanner
Scans the laser beam in the sample arm.
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gold-coated mirror
Reflects the reference beam.
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directional coupler
Recombines and interferes the back-reflected laser beams from the reference arm and sample arm.
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spectrometer
Transmits the interfered laser beams to the linear CCD camera.
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diffraction grating
Disperses the laser beam.
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linear CCD camera
Captures the focused laser beam.
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