Design method of variable curvature optical integrator

Abstract

The invention discloses a design method of a variable curvature optical integrator, relates to the technical field of optical instrument design, and the design method can improve the edge energy of output light spots and improve irradiation uniformity while ensuring that the irradiance reaches a solar constant. The design method comprises the following steps: determining the aperture and the number of integrator channels according to a Fresnel number; establishing a mathematical model of a two-dimensional plane of the variable curvature optical integrator by using a Fresnel diffraction formula, deducing a light intensity distribution mathematical function on a working surface, and determining the focal length of each circle of sub-eye lens; wherein the rear surface of the integrator field lens group adopts aspheric design, so that the side lobe effect is eliminated, and the imaging quality is improved. The variable curvature optical integrator is convenient to install, and improves the edge energy of output light spots and the irradiation uniformity under the condition that the irradiance reaches the solar constant.

Description

technical field [0001] The invention relates to the technical field of optical instrument design, and relates to a design method of a variable-curvature optical integrator capable of increasing output spot edge energy, which can increase output spot edge irradiation energy and improve irradiation uniformity. Background technique [0002] As a test device for simulating the characteristics of solar radiation, the solar simulator is widely used in aerospace, solar energy utilization and other fields. As an important homogenization device in the solar simulator, the optical integrator divides and superimposes the Gaussian radiation distribution collected and converged by the condenser, and outputs uniform and consistent light spots, which plays an important role in improving the performance of the solar simulator. [0003] At present, the compact optical integrator improves the uniformity of the beam by increasing the length of the beam passing path, but the structure is too la...

AI Technical Summary

Problems solved by technology

[0003] At present, the compact optical integrator improves the uniformity of the beam by increasing the length of the beam passing path, but the structure is too large and the installation is inconvenient; the cluster optical integrator ensures the consistency of the optical axis and effectively avoids the side lobe effect, but cannot Compensation of edge light, poor uniformity of irradiation at the edge of the spot, exit-pupil optical integrator, prevents superimposed imaging blur, but more affects the uniformity of edge irradiation; symmetrical optical integrator uses edge lens, expands the aperture of the integrator, and separates the projection lens group The method of compensating the uniformity of the edge of the irradiated surface by focusing etc., but the light energy loss rate is high and the installation and adjustment are difficult

The focal length of each small lens of the above-mentioned optical integrator is the same, resulting in low irradiated energy at the edge of the output spot. The design does not consider increasing the radiated energy at the edge of the integrator working surface, and does not consider the design idea of ​​making the focal length of the integrator different.

[0004] With the utilization and development of solar energy, it is necessary to increase the edge irradiated energy of the output spot of the solar simulator and improve the overall uniformity of the irradiated surface. The current technical level cannot meet the actual needs.

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