Patent
Image reconstruction method based on multi-viewing-angle multi-spectral tomography
Cao Zhang,Xu Lijun,Chen Jianliang,Qianwei Qu +3 more
- 09 Jun 2017
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TL;DR: In this paper, an image reconstruction method based on multi-viewing-angle multi-spectral tomography (MVS tomography) was proposed, which consists of utilizing a plurality of pieces of absorption spectrum information corresponding to gas molecules so that a laser which can cover an absorption spectrum range passes through a measured gas region from a manifold of viewing angles.
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Abstract: The invention provides an image reconstruction method based on multi-viewing-angle multi-spectral tomography The image reconstruction method comprises the steps of: utilizing a plurality of pieces of absorption spectrum information corresponding to gas molecules so that laser which can cover an absorption spectrum range passes through a measured gas region from a plurality of viewing angles, and acquiring corresponding projection measurement data; constructing an equation set for solving measured gas parameter values according to a coefficient matrix and projection measurement data; converting a problem of solving a non-homogeneous linear equation set into a problem of solving nonlinear optimization; and solving the nonlinear optimization problem by adopting an iteration method to obtain parameter distribution, and further acquiring a gas parameter distribution image Compared with a single-spectrum imaging system, the image reconstruction method has the effects of being capable of significantly improving the precision of parameter distribution image reconstruction, being high in resolution and good in reliability, and having wide application prospect
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Citations
Patent
Method for constructing 3D topography of weld seam based on grid structure laser
Zhiyong Li,Liu Hang,Jia Nana,Jieliang Ren,Xue Chunxia +4 more
- 26 Jan 2018
TL;DR: In this paper, a method for constructing the 3D topography of a weld seam based on a grid structure laser is presented. But the method requires the use of a grid-structured laser and an industrial camera.
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Patent
Two-dimensional temperature and concentration reconstruction system and method based on histogram information
Cao Zhang,Qiu Shuang,Xu Lijun,Guangyu Hou +3 more
- 29 Nov 2019
TL;DR: In this paper, a two-dimensional temperature and concentration reconstruction system and method based on histogram information, belongs to the technical field of tunable diode laser absorptionspectra and is used for two dimensional temperature and concentrate reconstruction.
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Patent
Two-dimensional temperature distribution reconstruction method based on four-angle laser absorption spectrum
Xu Lijun,Cao Zhang,Ran Chenhao,Zhang Hongyu,Qiu Shuang +4 more
- 09 Oct 2018
TL;DR: In this paper, a two-dimensional temperature distribution reconstruction method based on a four-angle laser absorption spectrum is proposed, which comprises the following steps of arranging four angle parallel laser beams, and acquiring temperature distribution histogram information on each optical path through multispectral absorption data, wherein a measured area is divided into N*N grid points, and temperature value discretization contains a set of M elements {T1, T2,..., TM}.
2
Patent
Laser absorption spectrum tomographic imaging technology-based airflow two-dimensional speed distribution measurement method
Xu Lijun,Qianwei Qu,Cao Zhang,Chang Liuyong +3 more
- 21 Dec 2018
TL;DR: In this paper, a laser absorption spectrum tomographic imaging technology-based airflow two-dimensional speed distribution measurement method was proposed for the measurement in a noncontact mode, and the measured two dimensional speed distribution can be built again.
2
Patent
Wavelength-changing tunable diode laser absorption spectrum gas detection device and method
Wang Zhongmin,Chang Tianying,Cui Hongliang,Cheng Liyao,Wu Chongjian,Li Ya,Cui Hongkui +6 more
- 04 May 2018
TL;DR: In this article, a diode diode laser absorption spectrum gas detection device and method is described, consisting of a laser, a circulator, a reflective probe, a photoelectric detector and a data conversion unit.
2
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