Laser Interlock Circuit for Predicted Dose Control in Scanning
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Solution Overview
Problem
Laser scanning systems face challenges in controlling laser light emission to prevent excessive energy exposure, particularly in environments where safety standards like IEC 60825-1 must be adhered to, and there is a need for systems to abruptly stop emission in case of malfunctions.
Innovation Solution
A scanning laser system integrated with an interlock circuit that determines predicted dosage amounts in different regions and adjusts or stops laser emission to prevent exceeding safety thresholds, using mechanisms like beam dumps or optical attenuators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If laser power is increased to improve signal-to-noise ratio and mapping performance, then measurement precision is improved, but harmful factors increase due to excessive energy exposure in certain regions
Solution Approach 1:
The interlock circuit performs preliminary calculations of predicted dosage amounts for different environmental regions before the laser actually emits light. By determining which regions will receive excessive exposure in advance, the system can prevent harmful effects before they occur while maintaining optimal laser power for measurement precision.
Solution Approach 2:
The system continuously monitors the laser pointing direction and environmental conditions, then feeds this information back to the interlock circuit which adjusts the laser power in real-time. This feedback mechanism allows the system to maintain high measurement precision while dynamically preventing excessive energy exposure in any given region.
2Reliability
If laser emission is abruptly stopped in case of malfunction to ensure safety, then reliability is improved, but productivity decreases due to interruption of laser scanning operations
Solution Approach 1:
The interlock circuit continuously calculates predicted dosage amounts and identifies potential safety issues before they become critical problems. By taking preliminary action to adjust laser power or redirect beams when thresholds are approached, the system prevents malfunctions from occurring in the first place, thereby maintaining both safety and operational continuity.
Solution Approach 2:
The system establishes safety margins by monitoring predicted dosage amounts and taking corrective action before actual excessive exposure occurs. This cushioning approach creates a buffer between normal operation and dangerous conditions, allowing the system to maintain productivity while ensuring safety through proactive rather than reactive measures.
Data Source
AI summary
Systems and methods are described that relate to a scanning laser system configured to emit laser light and an interlock circuit communicatively coupled to the scanning laser system. The interlock circuit may carry out certain operations. The operations include, as the scanning laser system emits laser light into one or more regions of an environment around the scanning laser system, determining a respective predicted dosage amount for each region based on the emitted laser light. The operations further include detecting an interlock condition. The interlock condition includes a predicted dosage amount for at least one region being greater than a threshold dose. In response to detecting the interlock condition, the operations include controlling the scanning laser system to reduce a subsequent dosage amount in the at least one region.