Light blocking ring arranging method based on stray light inhibition angle

Abstract

The invention belongs to the field of stray light inhibition design of optical systems and relates to a light blocking ring arranging method based on a stray light inhibition angle. The method is mainly based on attributes of matt paint sprayed on the inner wall of a light shield and the minimum stray light inhibition angle of a whole optical system. Through reasonable design arrangement, the aimthat the point source transmittance (PST) value at the inhibition angle point is achieved. The type of the black matt paint sprayed to the inner wall of the light shield is determined, then surface attributes of the black matt paint of the type are tested, absorption attributes of the black matt paint under different incident angle conditions are obtained according to test results, the incident angle alpha where the absorption rate of the black matt paint is highest is selected to serve as the inclination reference angle of a light blocking ring, after a ring tip coordinate point A of the first-level light blocking ring is determined, the inclination angle beta of the light blocking ring is set to be 90o-(alpha+theta), and the optimal PST value at the inhibition angle can be obtained.

Description

technical field [0001] The invention belongs to the field of stray light suppression design of an optical system, and relates to a method for setting a light blocking ring based on a stray light suppression angle. Background technique [0002] PST (point source transmittance) is a key index to evaluate the stray light suppression ability of space optical system. [0003] For large-scale space observation cameras, when designing stray light suppression, the proposed index requirements are usually: the PST value of the entire system at the suppression angle θ is required to be less than 10 n The order of magnitude, n is a negative number, usually -7, -8, -9 or even lower. The principle behind this indicator is: under normal circumstances, the off-axis stray light suppression ability of the optical system increases with the increase of the off-axis angle. Enhancement, that is, the PST curve monotonically decreases with the increase of the off-axis angle. [0004] In engineeri...

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Problems solved by technology

[0004] In engineering practice, when the length of the hood of the optical system is fixed, especially when the size is limited, it is usually necessary to iterate the parameters of the light blocking ring repeatedly, so as to obtain the suppression angle under the premise of a certain length of the hood. The result at the smallest PST, in this process, often takes a long time, and it is not easy to obtain obvious improvement

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