Particle field holographic 4F imaging system and method based on filtering

Abstract

The invention relates to a particle field holographic 4F imaging system and method. The invention particularly relates to a particle field holographic 4F imaging system and method based on filtering.The problems that when an existing 4F imaging device based on filtering is adopted for measurement, high-precision adjustment is difficult, the imaging quality is low, recorded image noise is large, imaging background noise is large, the test cost is high, and when a front lens set, a rear lens set and a filtering device are integrated, the filtering device cannot be replaced in different application scenes are solved. The 4F imaging system is characterized in that the system comprises a pulse laser, a beam expanding collimating mirror, a 4F imaging device and a recording medium which are sequentially arranged along a light path; the 4F imaging device comprises a front lens group, a vacuum assembly and a rear lens group; the vacuum assembly comprises a vacuum assembly sleeve, a filtering device, a first vacuum valve, a second vacuum valve, a front vacuum sealing window and a rear vacuum sealing window; the filtering device is detachably connected with the vacuum assembly sleeve in a sealing manner; and the filter glass is high-pass filter glass.

Description

technical field [0001] The invention relates to a particle field holographic 4F imaging system and method, in particular to a filter-based particle field holographic 4F imaging system and method. Background technique [0002] The particle field holographic diagnostic technology can obtain the three-dimensional quantitative information of the size, velocity, and spatial distribution of small particles in the particle field. It has the characteristics of non-contact, high precision, and large test space. It is one of the standard methods for particle field measurement. Particle field measurement usually adopts two recording methods, coaxial and off-axis; in practical applications, when measuring small particles on the order of microns, a 4F imaging device is usually used in the recording system; in this way, on the one hand, the recording medium can be ensured Safety, on the other hand, can meet the recording requirements of the far field distance. [0003] When the density o...

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Problems solved by technology

[0010] The purpose of the present invention is to provide a filter-based particle field holographic 4F imaging system and method to solve the problems of high-precision adjustment difficulties, low imaging quality, large noise in recorded images, and poor imaging performance when using existing filter-based 4F imaging devices for measurement. Large background noise, high test cost, and the technical problems that the filter device cannot be replaced in different application scenarios when the front and rear lens groups and the filter device are integrated as a whole

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