Violet Warning Lights for UV-Free Fluorescence Visibility
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Solution Overview
Problem
Existing warning lights that use invisible UV light to induce fluorescence in photoluminescent materials pose health risks due to harmful UV radiation, necessitating the development of a system that provides visible fluorescence without relying on UV light.
Innovation Solution
A warning light system using LEDs that emit violet light with a peak wavelength shifted into the visible spectrum and a lens or coating to filter out harmful UV radiation, accompanied by non-violet lights for visible warning signals, ensuring the fluorescence effect is achieved without hazardous UV exposure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If invisible UV light is used to induce fluorescence in photoluminescent materials, then visibility enhancement is achieved, but harmful UV radiation exposure increases
Solution Approach 1:
The patent changes the wavelength parameter of the light source from invisible UV (below 380nm) to visible violet (380-450nm). This parameter shift maintains the fluorescence-inducing capability while eliminating the harmful effects of UV radiation, as the visible violet light falls within the safe visible spectrum range that human eyes can detect without causing retinal damage or cataracts
Solution Approach 2:
The patent introduces a visible violet light intermediary that acts as a safe alternative to UV light for inducing fluorescence. This intermediary light source (visible violet LEDs) performs the same function of exciting photoluminescent materials but does so without the harmful radiation properties of UV light, effectively mediating between the need for visibility enhancement and the need to avoid harmful exposure
2Reliability
If UV light sources are used to provide sufficient fluorescence induction, then fluorescence effect is achieved, but eye and skin damage risk increases
Solution Approach 1:
The patent changes the spectral output parameter of the light source from UV wavelength range to visible violet wavelength range. This parameter modification maintains sufficient energy for fluorescence induction (as visible violet light still has adequate photon energy to excite photoluminescent materials) while eliminating the harmful effects associated with UV wavelengths, thereby maintaining reliability of the fluorescence effect without the harmful side effects
3Object-affected harmful factors
If visible violet light is used instead of UV light, then harmful UV radiation is reduced, but light output intensity may decrease
Solution Approach 1:
The patent optimizes the parameters of visible violet LEDs (wavelength, power, drive current) to maximize light output intensity within the visible spectrum. By carefully selecting LEDs with peak wavelengths in the 380-450nm range and adjusting operational parameters, the system achieves sufficient brightness for fluorescence induction while maintaining safe visible light levels that do not cause harmful exposure
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 enhances visibility of photoluminescent materials while significantly reducing the risk of UV damage, providing safer and more effective visibility in low-light environments.
Implementation Method 1
at least a lens through which light from each of the light sources when activated is projected. The second range of wavelengths is one of dominantly or more dominantly of higher wavelengths along the spectrum of visible violet illumination to human eyes than the first range of wavelengths, and the second peak wavelength is higher than the first peak wavelength
Implementation Method 2
the fluorescence inducing signals when outputted causes objects or surfaces having photoluminescent materials, such as phosphors, to fluoresce in order to enhance their visibility in low or zero ambient (natural and/or artificial) light environments
Implementation Method 3
optical effect known as fluorescence occurs when light in a specific wavelength directed to photoluminescent materials causes those materials to fluoresce and reflect back light which has been shifted towards the visible spectrum
Data Source
AI summary
A warning light having light sources for emitting light of different colors via at least a lens, where one of the colors is violet and other of the colors is non-violet along a spectrum of visible illumination. A controller selectably activates the light source(s) emitting non-violet light to provide visible warning signals, and the light source(s) emitting violet light to provide fluorescent inducing signals dominantly along the spectrum of visible illumination which causes any object or surface having phosphors to fluoresce in order to enhance their visibility in low or zero ambient light environments. The lens and/or optional filter, or coating along the lens, filters or blocks ultraviolet light to shift the peak wavelength of violet light source(s) so that fluorescent inducing signals are dominantly or more dominantly of higher wavelengths along the spectrum of visible violet illumination to human eyes. Single and dual warning light housings embodiments are provided.