Solar Simulator Integrator Lens Geometry for Parallelism
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Solution Overview
Problem
The existing solar simulator designs face a trade-off between achieving high parallelism and high illuminance of emission light, as increasing the focal distance of the collimation lens leads to increased light diffusion and reduced illuminance, making it difficult to maintain both high parallelism and uniformity of light on the irradiation surface.
Innovation Solution
A solar simulator design where the focal distance of the collimation lens is set such that the parallelism angle is less than 2.5°, and the emission angle of the integrator is configured to be smaller than the viewing angle of the collimation lens, with the integrator composed of multiple minute integrators, each with a diameter of 5 mm or less, to optimize light uniformity and parallelism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the focal distance of the collimation lens is increased to increase the parallelism angle, then the parallelism of emission light is improved, but the distance between the integrator and collimation lens increases causing light diffusion and reduced illuminance
Solution Approach 1:
The invention changes the emission angle parameter of the integrator to be smaller than the viewing angle of the collimation lens. This parameter optimization allows the system to achieve high parallelism (parallelism angle less than 2.5 degrees) while maintaining short focal distance and high illuminance, resolving the contradiction between parallelism improvement and illuminance maintenance.
2Illumination intensity
If the focal distance of the collimation lens is increased to increase the parallelism angle, then the parallelism of emission light is improved, but light energy is lost due to diffusion outside the lens
Solution Approach 1:
By optimizing the emission angle of the integrator to be smaller than the viewing angle of the collimation lens, the invention ensures that light remains within the lens aperture. This parameter optimization simultaneously achieves high parallelism (parallelism angle less than 2.5 degrees) and prevents light energy loss from diffusion, resolving the contradiction between parallelism improvement and energy loss prevention.
3Illumination intensity
If the focal distance of the collimation lens is increased to increase the parallelism angle, then the parallelism of emission light is improved, but the uniformity of emission light is reduced
Solution Approach 1:
The invention optimizes the emission angle parameter of the integrator to be smaller than the viewing angle of the collimation lens. This parameter configuration enables the system to achieve high uniformity of emission light while maintaining short focal distance and high parallelism (parallelism angle less than 2.5 degrees), resolving the contradiction between uniformity improvement and focal distance reduction.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration achieves high illuminance and uniformity on the irradiation surface while maintaining high parallelism, with the focal distance adjustment allowing for improved light distribution and reduced energy loss, as demonstrated by the measurements showing increased illuminance and uniformity.
Implementation Method 1
after collecting light emitted from a light source (not shown) to be close to an optical axis using an integrator 4 for uniform irradiation where an incident angle θ1 and an emission angle θ2 are equally designed
Implementation Method 2
the light is converged by a collimation lens 5, thereby obtaining emission light having high parallelism
Data Source
AI summary
A solar simulator that simultaneously solves problems of high parallelism and high illuminance of emission light and increases uniformity of the emission light is provided.The following is an examiner's statement of reasons for allowance: Instant application claims and discloses a solar simulator that allows light radiated from a light source to be incident on an integrator, allows light emitted from integrator to be incident on a collimation lens, and allows parallel light to be emitted from collimation lens when a circumradius of integrator is r, a parallelism angle of parallel light is .phi., and a focal distance of collimation lens is f=r/tan.phi., focal distance f is selected so parallelism angle .phi. becomes less than 2.5.degree., and when an emission angle of light emitted from integrator is .theta., a diameter of collimation lens is D, and a viewing angle of collimation lens when viewed from integrator is .theta.X=2.times.a tan (D/2f), emission angle .theta. is configured to be smaller than viewing angle .theta.X.The combination of limitations claimed is not found, taught or suggested by the prior art.