Submersible LED Illumination System with Thermal Management
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Solution Overview
Problem
Conventional LEDs face limitations in heat dissipation and light distribution, particularly in marine applications where high luminosity and efficient heat management are crucial, leading to thermal runaway and inefficient light penetration in underwater environments.
Innovation Solution
A submersible LED illumination system featuring an array of LEDs with a combination of white and single-color LEDs, surrounded by reflectors for focused beam control, and a housing with a transparent window and optically transparent material to reduce total internal reflection, along with a heat sink and thermal management system to prevent overheating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If high-power LEDs are used to increase brightness and luminosity, then illumination intensity is improved, but heat dissipation becomes insufficient leading to thermal runaway
Solution Approach 1:
The LED array is divided into multiple individual LED elements mounted on separate heat sinks. Each LED operates independently with its own thermal management path, preventing thermal runaway while maintaining high overall luminosity. The segmentation allows heat to be dissipated from multiple distributed points rather than concentrating thermal load on a single component.
Solution Approach 2:
A transparent fluid with refractive index matching the optical components fills the space between LEDs and the front window. This intermediary medium reduces total internal reflection losses and improves light transmission efficiency, allowing higher LED power levels without excessive heat generation in the optical path.
2Illumination intensity
If multiple LEDs are combined in a composite light-source structure to achieve high light levels, then illumination intensity is improved, but device complexity increases
Solution Approach 1:
Multiple LED elements are mounted in a unified array configuration on a common substrate, sharing a single housing structure and front window assembly. This merging approach achieves high light output through combined LED output while avoiding the complexity of separate independent lighting units, reducing overall system complexity despite the multi-LED configuration.
3Ease of manufacture
If conventional LED structures are used, then manufacturing simplicity is maintained, but light penetration efficiency in marine environments deteriorates
Solution Approach 1:
The refractive index parameter of the material between the LED array and front window is specifically optimized to match the optical components. This parameter change reduces total internal reflection at interfaces, improving light penetration efficiency into the marine environment while maintaining manufacturing simplicity through the use of standard optical materials.
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 system achieves enhanced light penetration and distribution in marine environments, preventing thermal runaway and improving the efficiency of LED illumination systems by effectively managing heat and optimizing light output.
Implementation Method 1
Semiconductor LEDs have replaced conventional incandescent, fluorescent and halogen light sources in many applications due to their small size, reliability, relatively inexpensive cost, long life and compatibility with other solid state devices. In a conventional LED, an N-type gallium arsenide substrate that is properly doped and joined with a P-type anode will emit light in visible and infrared wavelengths under a forward bias.
Implementation Method 2
A first portion of the reflectors may be configured to provide a far field relatively narrow beam of illumination and a second portion of the reflectors may be configured to provide a near field relatively wide beam of illumination.
Implementation Method 3
A optically transparent material may be disposed between the array of LEDs and the window.
Data Source
AI summary
A submersible LED illumination system may include an array of LEDs, with a first portion of the LEDs capable of emitting white light and a second portion of the LEDs capable of emitting light of a single color. The system may further include a plurality of reflectors surrounding a corresponding one of the LEDs, where a first portion of the reflectors may be configured to provide a far field relatively narrow beam of illumination and a second portion of the reflectors may be configured to provide a near field relatively wide beam of illumination. A housing may enclose the array of LEDs and the reflectors. A transparent window may be disposed in the housing, an an optically clear material may be disposed between the LEDs, reflectors, and transparent window.