Variable Light Diffuser Sphere for Plant Gas Exchange
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Solution Overview
Problem
Current infrared gas analysis equipment lacks the capability to provide a diffuse light source, preventing researchers from quantifying the effects of diffuse light on leaf gas exchange, which is crucial for understanding plant physiology and ecosystem carbon and water fluxes.
Innovation Solution
The development of light diffuser spheres or integrating spheres that can control the distribution of light angles, allowing for the creation of variable proportions of direct and diffuse light, integrating with portable infrared gas analyzers to simulate natural light conditions and measure leaf gas exchange accurately.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If direct light sources are used in infrared gas analysis equipment, then the equipment structure remains simple and light delivery is straightforward, but the equipment cannot quantify the effects of diffuse light on leaf gas exchange
Solution Approach 1:
An integrating sphere is introduced as an intermediary device between the light source and the leaf chamber. The sphere contains a diffuse reflective interior surface that transforms direct light from the LED source into diffuse light that reaches the leaf from multiple angles, enabling quantification of diffuse light effects while maintaining a relatively simple overall equipment structure
Solution Approach 2:
The patent transforms the light delivery from a one-dimensional direct path to a three-dimensional diffuse distribution by using the integrating sphere. The light source is positioned at the center of the sphere, and the diffuse reflective interior surface scatters light in all directions, creating a multi-angular illumination environment that simulates natural diffuse light conditions
2Manufacturing precision
If artificial light sources with unknown angular distribution are used, then the equipment is simple to operate, but the angular distribution of light reaching the leaf surface cannot be controlled
Solution Approach 1:
The integrating sphere structure inherently provides the desired light distribution control through its geometric design and diffuse reflective interior surface. The system self-regulates the angular distribution of light without requiring complex external control mechanisms, maintaining ease of operation while achieving precise control over light angles reaching the leaf surface
3Adaptability or versatility
If direct light perpendicular to leaf surface is assumed, then measurements are consistent with solar direct light conditions, but the effects of diffuse light on leaf gas exchange cannot be studied
Solution Approach 1:
The patent changes the key parameter of light angular distribution by using the integrating sphere to transform the light field from a narrow perpendicular beam to a broad diffuse distribution. This parameter change enables the simulation of different natural light environments (direct sunlight, cloudy conditions, forest understory) and allows precise quantification of diffuse light effects on leaf gas exchange measurements
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
Enables researchers to quantify the impact of diffuse light on photosynthesis and transpiration, providing insights into how plants respond to varying light environments, thereby improving the understanding of ecosystem productivity and carbon cycling.
Implementation Method 1
light diffuser spheres or integrating spheres that can control the distribution of angles of light reaching a surface
Implementation Method 2
Measurements made using infrared gas analyzers often utilize artificial light sources
Data Source
AI summary
Disclosed herein are light diffuser devices comprising a sphere having at least two openings, a track, a light source, a cart, and one or more plates, and their methods of use. Also, disclosed here are light diffuser systems comprising a light diffuser device and a portable infrared gas analyzer.