LED Solar Simulator Spectral Control via Segmentation
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Solution Overview
Problem
Current solar simulator systems rely on high-intensity lamps, which are costly and complex, and face challenges in reproducing the solar spectrum due to limitations on materials used in optical filters, making it difficult to achieve desired wavelength ranges.
Innovation Solution
An LED-based solar simulator system utilizing multiple LED groups, a field flattening device, and a diffractive element to produce a broad spectrum light source, allowing for selective variation of the wavelength spectra and efficient reproduction of the solar spectrum.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If high intensity lamps are used to reproduce the solar spectrum, then the spectral output can be achieved, but the system cost and complexity increase
Solution Approach 1:
The solar simulator is divided into multiple LED groups, each emitting at a specific wavelength range. This segmentation allows the system to reconstruct the solar spectrum through combination of discrete spectral components rather than using a single high-intensity lamp with complex filters.
Solution Approach 2:
The system changes the spectral parameters by selectively controlling the intensity of individual LED groups at different wavelengths. This allows dynamic adjustment of the spectral output to match solar characteristics without requiring physical optical filters.
2Adaptability or versatility
If optical filter systems are used to tune the spectral output, then the desired wavelength range can be selected, but the system cost and complexity increase
Solution Approach 1:
The system provides dynamic spectral tuning by electronically controlling the intensity of individual LED groups through PWM dimming. This replaces static optical filters with a dynamic, programmable approach that can selectively activate any combination of wavelength ranges.
Solution Approach 2:
The patent replaces the mechanical/optical filter system with an electronic control system. Instead of physically filtering light wavelengths, the system electronically selects which LED groups to activate, substituting mechanical filtering with electronic wavelength selection.
3Adaptability or versatility
If multiple optical filters are used to enable various wavelength ranges, then spectral versatility is improved, but the device complexity and material limitations increase
Solution Approach 1:
Each LED group serves multiple functions by contributing to different portions of the solar spectrum. The modular LED array design allows any combination of LED groups to be activated, providing universal spectral coverage without requiring separate filter systems for each wavelength range.
Solution Approach 2:
The system combines multiple LED types with different spectral characteristics into a unified array. This composite approach creates a versatile light source that can reproduce the solar spectrum across broad wavelength ranges without relying on colored glass filters subject to material limitations.
4Illumination intensity
If high intensity lamps are used, then the solar spectrum can be reproduced, but the energy consumption increases
Solution Approach 1:
The system uses partial action by selectively activating only the LED groups necessary to produce the desired spectral output. Rather than continuously operating all LEDs at high intensity, the system activates specific wavelength ranges as needed, reducing overall energy consumption while maintaining spectral accuracy.
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
The LED-based system provides a low-power, cost-effective solution for reproducing the solar spectrum, enabling easy adjustment of spectral characteristics and overcoming material limitations, thus improving the efficiency and versatility of solar simulator systems.
Implementation Method 1
an LED-based solar simulator light source having at least one LED array formed by multiple LED groups of LED assemblies
Implementation Method 2
Each LED group may be configured to output at least one optical signal within a discrete spectral range
Implementation Method 3
the diffractive element may be configured to receive and combine the optical signals from the multiple LED groups to produce a broad spectrum light source output signal
Implementation Method 4
the field flattening device may be configured to attenuate or flatten at least one optical characteristic of the multiple outputs from the LED groups
Data Source
AI summary
The present application discloses a LED-based solar simulator light source having at least one LED array formed by multiple LED groups of LED assemblies, at least one field flattening device, at least one diffractive element, and at least one optical element configured to condition the broad spectrum light source output signal and direct the light source output signal to a work surface.