ZL 202320159901X – Coaxial Holographic Particle Imager with Adjustable Magnification
Researchers: Cheng LI, Xiaofei ZHANG, Hongtao QIAN, Biaosheng LUO, Yixun LIU
Categories: Particle Imagers
Jurisdiction: China
Current status: Granted
Basic Information
The lightweight airborne coaxial holographic particle imager can be mounted on the multi-rotor UAV flight platform to provide technical support for the in-situ characterization of particles for aerosol research in multiple scenarios such as sea surface, clouds, rain and snow, and deserts.
The cage airborne coaxial holographic particle imager is wrapped by a high-toughness photopolymer resin 3D printed sealed support shell on the outside, and the cage rigid structure inside supports the collimated optical path composed of a laser, filter, objective lens and collimating lens, and is equipped with a high-quality imaging system with 1us ultra-small exposure and adjustable magnification (1X-3X), and the 3D printing gasket can easily change the particle sampling space size and focus surface to adapt to the particle sampling environment of different concentrations. The laser is powered by USB, and the camera is powered by USB3.0 and transmitted by USB, which can be easily connected to the Raspberry Pi for work. The present invention is small in size, light in weight, large in stiffness, high in imaging quality, simple in assembly, convenient for multi-rotor UAV to carry out sampling of particle size, shape, concentration and the like in different environments flexibly in the air.
Innovation & Advantages
Compared with the existing technology, the light-duty airborne coaxial holographic particle imager can improve the integration of the equipment, combine the optimization of mechanical structure and optical system, and reduce the cumbersome optical adjustment mechanism, so that it can carry out the in-situ characterization of air pollutants and high aerosols through the body, and improve the adaptability of the equipment to different scenarios and multiple data, including the three-dimensional spatial distribution of the measured particle size, shape, concentration and particle field, and the magnification of the imaging system can be adjusted. It can realize accurate in-situ measurement and three-dimensional reconstruction of spatial distribution of particle size and shape from sub-micron to millimeter in a large particle size range, and the sampling space can be adjusted, which can be adjusted according to the actual application scenario, combined with aerosol concentration and particle size, and further expand the application scenarios of the equipment in microscopic particle measurement such as particle size and distribution, particle shape distribution, spatial three-dimensional distribution and concentration.
Quantified Improvement
(1) Imager weight: 1.38 kg (1X); 1.43kg (2X)
(2) Camera power: 3.4W, 200mW laser power: 2W
(3) Adjustable magnification: 0.5-1.75X(1X); 1.75-3X（2X）
(4) Spatial resolution: 3.45 μm/pixel (1X); 1.73 µm/pixel (2X);
(5) Adjustable sampling volume: 1-30mm (different concentration test).
Technology Maturity
Small batch production, engineering application stage
Technology Transfer Method
Licensing, transfer of IP ownership, self-application or industrialization
Potential Application
The diffractive light field formed by coherent light irradiating the microscopic particle field and the coherent reference light form a two-dimensional interference pattern, that is, a hologram, which contains the size and shape information of the microscopic particles and the spatial three-dimensional position information.
At present, the existing coaxial holographic particle imager is mostly the equipment or device stably placed in the environment such as laboratory and test site, and these particles can be microscopic solid, liquid and solid-liquid microscopic particles containing plasma, so its structural design does not need to consider the compactness and portability of the overall mechanism, and occupies more space and has a large weight, so it is not suitable for the test and use requirements of multiple scenes, and the structure of magnification adjustment is more complex and difficult to operate, and the structure is more scattered, It is difficult to easily use multiple samples.
If you are interested, please feel free to contact gtec@gtiit.edu.cn for more information.