Reflection Control Layer for Mobile Body Air Resistance
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Solution Overview
Problem
Conventional titanium oxide-based infrared fluorescent probes are ineffective for increasing reflection intensity of sunlight in the absorption band of sunlight absorbing substances, which limits their ability to reduce air resistance by heating the mainstream air around a mobile body.
Innovation Solution
A mobile body with a reflection control layer that absorbs light in the wavelength region from 0.3 micrometers to 0.75 micrometers and emits light in the wavelength region from 0.75 micrometers to 100 micrometers, effectively increasing the reflection intensity of sunlight and heating the mainstream air, thereby reducing air resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If titanium oxide is used as an infrared fluorescent substance, then fluorescence emission in the 0.7-1.2 micrometer region is achieved, but the absorption band requirement of >=0.75 micrometer for sunlight absorbing substances is not met
Solution Approach 1:
The patent changes the key parameter of the fluorescent substance from titanium oxide (absorption band 0.3-0.4 micrometer) to red fluorescent substances with absorption bands >=0.75 micrometer. This parameter change enables compatibility with sunlight absorbing substances while maintaining fluorescence emission capabilities, allowing the reflection control layer to effectively increase reflection intensity in the absorption band region.
2Temperature
If the reflection intensity of sunlight is increased to heat the mainstream air, then air resistance is reduced, but conventional fluorescent materials cannot effectively absorb light in the required wavelength region
Solution Approach 1:
The patent changes the absorption band parameter of the fluorescent substance to match the sunlight absorbing substance's absorption band (>=0.75 micrometer). This ensures that the reflected sunlight can be effectively absorbed by the mainstream air, converting optical energy to thermal energy and heating the air to reduce its density and air resistance.
Solution Approach 2:
The patent converts the reflected sunlight (which would otherwise be wasted) into a beneficial heating effect. By using fluorescent substances with absorption bands matching sunlight absorbing substances, the reflected light is transformed into thermal energy that heats the mainstream air, turning a potential loss into a useful function for reducing air resistance.
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 proposed solution reduces air resistance by increasing the temperature of the mainstream air around the mobile body, leading to a density reduction of approximately 2% in the air, resulting in a corresponding reduction in air resistance, as verified through experimental simulations.
Implementation Method 1
a reflection control layer 21 that absorbs light in a wavelength region from 0.3 micrometer to 0.75 micrometer of incident sunlight, and emits light in a wavelength region from 0.75 micrometer to 100 micrometers
Implementation Method 2
the absorption band of the sunlight absorbing substance is equal to or longer than 0.75 micrometer
Data Source
Figure 1~2A
Figure 2B~3
Figure 4
AI summary
A mobile body (1) includes a reflection control layer (21) that is formed on a surface of the mobile body, to absorb light in a wavelength region from 0.3 micrometer to 0.75 micrometer of incident sunlight, and emit light in a wavelength region from 0.75 micrometer to 100 micrometers.