Measurement method for inhomogeneous medium field based on Hartmann ray tracing
A non-homogeneous medium and ray tracing technology, which is applied to the measurement of phase influence characteristics, etc., can solve the problems of high precision of equipment processing and installation, high cost, low measurement precision of schlieren method and shadow method, etc.
Active Publication Date: 2019-06-14
CHINA JILIANG UNIV
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[0011] Looking at the above-mentioned spatial measurement methods for inhomogeneous media fields, each has its own advantages and disadvantages. Interferometric methods require high precision in equipment processing and installation, which makes their costs higher, while the measurement accuracy of schlieren and shadow methods is low.
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[0053] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.
[0054] The measurement method of inhomogeneous medium field based on Hartmann ray tracing, such as figure 2 , 3 As shown, including the following specific content:
[0055] Each light point on the projection screen 2 is used as a point light source to emit spherical incident light to the measurement space 3, and one of them forms a spherical incident light with a deflection angle of θ with the optical axis 1 and penetrates the inhomogeneous medium field refraction inside the measurement space 3 A deflected ray parallel to the optical axis 1 is formed, and the deflected ray parallel to the optical axis 1 emitted from the measurement space 3 is directed to the lens 4, and the lens 4 refracts the deflected ray parallel to the optical axis 1 again, after refraction The deflected light is filtered through the object-space telecentric aperture 5 ...
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The invention discloses a measurement method for an inhomogeneous medium field based on Hartmann ray tracing, which comprises calculating an image by adopting a color three-step phase-shifting methodand obtaining the phase information, and calculating to obtain the change data of refractive index of a gas-liquid mixed medium existing in the measurement space by adopting an inverse integral curvethree-dimensional reconstruction algorithm. The measurement method adopts the color three-step phase-shifting method, combines with the inverse integral curve three-dimensional reconstruction algorithm of the three-dimensional inhomogeneous medium field, realizes the accurate tracing of the measured ray in the inhomogeneous medium field and the measurement of the transient refraction characteristics of a three-dimensional refractive index through the combination setting of a projection screen and a telecentric optical system, and greatly improves the measuring precision and efficiency. The measurement system for an inhomogeneous medium field based on Hartmann ray tracing has the advantages that the overall design is precise; the measuring accuracy is high; the cost is low; the applicationscope is wide; the important theory significance and the engineering application value are achieved; and the promotion and application are suitable.
Description
technical field [0001] The present invention relates to a measurement method, in particular to a measurement method of inhomogeneous medium field based on Hartmann ray tracing. Inhomogeneous medium field refers to the uneven spatial distribution due to factors such as pressure, velocity, temperature, density, and material. Uniformly formed spatial physical properties Non-uniform spatial field, including the non-uniform medium field formed by temperature, pressure, and flow, as well as the non-uniform medium field formed by liquid-liquid mixed medium, gas-liquid mixed medium, and gas medium. Background technique [0002] The non-uniform medium field refers to the non-uniform space field with non-uniform spatial physical characteristics due to the uneven spatial distribution of factors such as pressure, velocity, temperature, density, and material. The measurement of the non-uniform medium field can realize physical quantities such as temperature, pressure, and airflow. recurr...
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Inventor 孔明王道档单良赵军许新科刘维徐平龚志东
Owner CHINA JILIANG UNIV