Handheld Laser Plasma Feedback for Reflection Hazard Shutdown
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Solution Overview
Problem
Handheld laser devices with high power levels pose safety hazards due to invisible infrared radiation, as users may inadvertently expose themselves to prolonged radiation if the laser energy is reflected rather than absorbed by the workpiece, and existing cooling systems are bulky, making them impractical for small workspaces.
Innovation Solution
A handheld laser system equipped with a plasma sensor that detects plasma emission during material processing, a controller to manage laser power based on optical intensity, and an air-cooling system to reduce size and weight, ensuring safe operation and portability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If high power laser diodes are used to increase laser power, then productivity and material processing capability are improved, but safety hazards increase due to invisible infrared radiation that users cannot detect
Solution Approach 1:
The system employs a plasma sensor that continuously monitors the material processing interaction and provides feedback to the controller. When the sensor detects abnormal conditions (such as lack of plasma generation indicating laser reflection), the controller automatically adjusts or shuts off the laser power, creating a closed-loop safety mechanism that responds to real-time processing conditions
Solution Approach 2:
A plasma sensor acts as an intermediary between the laser beam and the user's safety. The sensor detects plasma emission from the material processing zone, serving as an indirect indicator of proper laser absorption. This intermediary provides early warning of potential safety hazards before they affect the user
2Temperature
If large water-based or liquid refrigerant-based chillers are used to cool the laser, then laser cooling effectiveness is improved, but device portability and ease of operation deteriorate due to increased size and weight
Solution Approach 1:
The patent replaces complex mechanical cooling systems (water-based or liquid refrigerant-based chillers) with an air-cooling system. This substitution eliminates the need for heavy cooling liquids and associated pumping mechanisms, significantly reducing system weight and complexity while maintaining adequate cooling performance for handheld operation
Solution Approach 2:
The cooling approach changes from liquid-based thermal management to air-based thermal management. By changing the cooling medium parameter from liquid to gas, the system achieves portability improvements while maintaining functional cooling capability through enhanced air flow design
3Temperature
If conventional cooling systems are used, then laser cooling is effective, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent replaces complex mechanical cooling systems with a simplified air-cooling architecture. This eliminates numerous components including liquid chillers, pumps, hoses, and associated control systems, reducing both device complexity and manufacturing cost while maintaining functional cooling
Solution Approach 2:
The patent extracts and removes the complex liquid cooling subsystem from the overall laser system. By taking out the water-based or refrigerant-based chiller components and replacing them with air cooling, the system achieves simplification without compromising essential thermal management functions
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 safely manages high-power laser operations by shutting off the laser when abnormal conditions occur and provides a compact, portable solution for material processing, enhancing user safety and operational flexibility in small spaces.
Implementation Method 1
a plasma sensor configured to detect plasma emitted from the workpiece material during a material processing operation
Implementation Method 2
an air-cooling system coupled to the laser source for dissipating heat
Data Source
AI summary
A handheld laser system. In certain examples the handheld laser system includes a laser source emitting laser light at a wavelength for performing a material processing operation on a workpiece material with a laser beam of the emitted laser light, a plasma sensor configured to detect plasma emitted from the workpiece material during a material processing operation, and a controller coupled to the plasma sensor and configured to: compare an optical intensity value obtained by the plasma sensor to a threshold value at a time when a predetermined time period has elapsed after the material processing operation has commenced, and produce a control command based on the comparison.