System and method for measuring three-dimensional volume scattering function of microparticle in water

Abstract

The invention discloses a system for measuring a three-dimensional volume scattering function of a microparticles in water. The system comprises a parabolic spherical reflector, a sample pool, a telescope group, a photoelectric detector and a computing processing unit, wherein the sample pool is arranged in a reflector cavity of the parabolic spherical reflector, the center position of the sample pool is located in a parabolic spherical focal point of the reflector cavity of the parabolic spherical reflector, incident light is converged at the reflector cavity focal point position, incident to a parabolic spherical surface after being subjected to particle scattering in the sample pool, transformed into parallel scattered light, received by the photoelectric detector after passing through the telescope group, and transmitted to the computing processing unit for processing, and thus, the three-dimensional volume scattering function of the microparticle can be obtained. The invention further discloses a method for measurement by utilizing the system. According to the invention, the problem of detection deviation generated when a plurality of detectors are used for detecting the volume scattering functions of different angles is avoided, the acquired image is good in uniqueness and high in contrast ratio and can be completely fixed in a work process, and the measuring stability is good and the measuring speed is high.

Description

technical field [0001] The invention belongs to the field of optical measurement, and in particular relates to a measurement system for a three-dimensional body scattering function of tiny particles in water and a measurement method using the system. Background technique [0002] The ocean is the space for human survival and development, and it contains extremely rich natural resources. Researching and making good use of the ocean will become an inevitable choice for human survival and development. Phytoplankton with a size distribution of 100nm to 1000μm is a suspended particle, which is an important part of the marine biological chain and sea water. 50% of the earth's oxygen is produced by phytoplankton photosynthesis. Its type and size distribution have important effects on water quality and ecological balance. important meaning. The volume scattering function (VSF) of suspended particles in water is an inherent optical property of water, which describes the directionali...

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Problems solved by technology

The existing method for measuring the scattering function of particles in water, a multi-spectral scattering function measuring instrument (MVSM) successfully developed in 2003 as an example, it adopts the characteristics of water body scattering and measurement difficulties in different scattering angle ranges A variety of schemes, characterized by erecting the sample cell part on a rotating platform, and working with the same detector rotating 360° around the platform, can realize the measurement of the upper body scattering function at any angle in the platform plane, but thus The synchronization of the measurement cannot be guaranteed, that is, simultaneous measurement of different angles, and the measurement cycle is too long to meet the requirements of rapid measurement in the actual environment

Another example is the multi-angle scattering optical instrument (MASCOT) developed by WETLabs. By setting detectors in multiple directions on the same circumference for detection, it can simultaneously measure the volume scattering function of multiple separated single-angle scattered lights, but this The measurement accuracy of the method depends on the actual performance of the selected detectors, and the difference in the detection effect of different detectors will inevitably affect the calculation results

At the same time, considering the influence of the particle shape on its scattering properties, only the measurement of the one-dimensional volume scattering function in the plane cannot accurately characterize the scattering properties of the particles. Therefore, it is necessary to propose a three-dimensional Method and Practical System for Volume Scattering Function Measurement

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