Eye-Safe Laser Warning Device Using Beam Segmentation
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Solution Overview
Problem
Conventional handheld laser-based warning devices are not eye-safe due to their point source nature, causing potential eye damage, and attempts to address this issue, such as reducing laser power or beam expansion, result in reduced effective range or increased device size and bulkiness.
Innovation Solution
An optical device with a high-intensity localized light source, a diffuser to modify the beam intensity distribution, and a collimator to produce collimated light with a substantially uniform intensity over the output aperture, ensuring eye safety while maintaining a compact and effective range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If laser power is reduced to an eye-safe level, then eye safety is improved, but effective range is reduced
Solution Approach 1:
The laser beam is segmented into multiple sub-beams by the diffuser element, transforming a single high-intensity point source into multiple lower-intensity beams. This segmentation reduces the power density at any single location while maintaining total optical power, achieving eye safety without sacrificing effective range.
Solution Approach 2:
The invention transitions from a point source (0D) to an extended source by using a diffuser with multiple sub-beams arranged in a specific pattern. This dimensional change spreads the laser power over a larger angular space, reducing the intensity captured by the eye's iris while maintaining visibility at long ranges.
2Object-affected harmful factors
If the laser beam is expanded to reduce captured power, then eye safety is improved, but device size and bulkiness increase
Solution Approach 1:
Instead of uniformly expanding the beam with bulky optical elements, the invention segments the beam into discrete sub-beams using a compact diffuser. This segmentation achieves the same eye safety effect as beam expansion but with a much more compact device form factor suitable for handheld operation.
3Object-affected harmful factors
If multiple point laser sources are used to reduce intensity, then eye safety is improved, but device complexity and cost increase
Solution Approach 1:
The invention uses a single laser source that is optically segmented into multiple sub-beams by a diffuser element. This approach achieves the same eye safety effect as multiple independent laser sources but with significantly reduced complexity, as it requires only one laser diode and one diffuser instead of multiple lasers and their associated control systems.
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 solution provides a compact, eye-safe visual warning device that is effective beyond 200 meters, with a power density and apparent source subtense that reduces the risk of eye damage, meeting Class 2M laser safety standards and maintaining the device's ease of use and portability.
Implementation Method 1
a diffuser for modifying a beam intensity distribution of the emitted light from the high intensity localised light source to generate diffused light
Implementation Method 2
a collimator for collimating the diffused light from the diffuser to provide collimated light for emission from an output aperture
Data Source
AI summary
An optical device for providing a visual warning indication is disclosed. The optical device includes a high intensity localized light source such as a laser diode and a diffuser for modifying a beam intensity distribution of the emitted light from the high intensity localized light source to generate diffused light. The device further includes a collimator for collimating the diffused light from the diffuser to provide collimated light for emission from an output aperture to provide the visual warning indication. The beam intensity distribution of the emitted light is modified by the diffuser to generate a substantially uniform intensity distribution of the collimated light over the entire output aperture.