Dual-digital holographic imaging device for measuring setting velocity of suspension particle
A technology of digital holography and suspended particles, which is applied in the direction of instruments, can solve the problems of high power supply, high input cost, and large volume, and achieve the effect of reducing costs and improving the scope of application
Inactive Publication Date: 2016-05-25
OCEAN UNIV OF CHINA
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Problems solved by technology
The use of two laser holographic imaging devices requires two lasers, which will consume a large power supply and bring a large number of batteries to battery-powered underwater instruments, resulting in large volume and high investment costs.
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[0025] The invention provides a double digital holographic imaging device for measuring the sinking velocity of suspended particles with a single laser, which includes a laser, a collimating beam expanding lens, a triangular prism, two reflecting mirrors and two cameras. The lens converts the beam into a beam of parallel light, and the triangular prism and two mirrors separate the beam from the collimator beam expander into two interfering lights at a certain distance. The interfering light passes through the observed water body and reaches the two cameras for imaging, thereby synchronizing Record two sets of holographic images.
[0026] The digital holographic device also includes a filter, which is specifically composed of a microscopic objective lens and a pinhole, through which a point light source interfering spherical wave is formed.
[0027] The triangular prism is coated with a reflective film, which converts the collimated light transmitted by the filter into two beam...
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The invention provides a single-light source dual-holographic imaging device for measuring setting velocity of a suspension particle. The imaging device comprises a laser, a collimating and beam expanding lens, a triangular prism, two reflecting mirrors and two cameras, wherein interference light emitted from the laser forms parallel light beams through the collimating and beam expanding lens, the triangular prism and the two reflecting mirrors are used for changing parallel light beams into two beams of parallel interference light which are separated at a certain distance in space, the two beams of light pass through an observation water body space and then arrive at the two cameras for imaging, so that holographic images at two different positions are synchronously recorded. In the holographic device, the laser interference light source is utilized to provide interference light beams with the same quality, different-layer regions in a vertical line direction can be synchronously imaged by the two Ethernet cameras, commercialized image processing software which is mature currently can be used for analyzing the setting velocities, the sizes, the shapes and space trajectories of the suspension particles separated at different distances, and the variable data of the suspension particles in different-height layers is acquired in real time.
Description
technical field [0001] The technical field of ocean observation of the present invention relates in particular to a double digital holographic device for measuring the sinking velocity of suspended particles. Background technique [0002] The sinking velocity refers to the speed at which the particles in the water body reach a stable settlement during the process of falling. The study of suspended particles in the ocean has great application and scientific significance. For example, the sinking speed of suspended sediment can deepen the understanding of the transport process of sediment under the influence of dynamic factors, the evolution mechanism of seabed landforms, and the disasters caused by the hollowing out of submarine pipelines in engineering; quantitative observation of suspended organic particles in seawater The sink rate is the core factor for studying some major scientific issues such as the effect of human activities on the global carbon cycle, the mechanism o...
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IPC IPC(8): G03H1/08
CPCG03H1/0866
Inventor 于新生杨震
Owner OCEAN UNIV OF CHINA