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

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