Beam Shutter Sensor Circuit for Ultrashort Laser Defect Detection
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Solution Overview
Problem
Existing laser beam shutter systems fail to reliably detect defects in reflecting optical units, particularly with ultrashort pulse lasers, as the laser beam can pierce the holding arm without causing appreciable heating, leading to potential personal injury and property damage.
Innovation Solution
A beam shutter system with a sensor circuit and evaluation device that includes a sensor component between the reflecting optical unit and the holding arm, where the sensor component changes properties upon being impinged by the laser beam, allowing the evaluation device to detect defects and switch off the laser light source, even in the absence of temperature changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a temperature-sensitive bimetal component is used to detect laser beam penetration, then detection reliability is improved for continuous wave or long pulse lasers, but detection fails for ultrashort pulse lasers that do not generate appreciable heating
Solution Approach 1:
The patent replaces the temperature-sensitive bimetal component (thermal/mechanical detection system) with a capacitive sensor circuit that detects the position of the reflecting optical unit through electrical field changes. This substitution enables detection to work with ultrashort pulse lasers that do not generate heat, while maintaining reliability for continuous wave lasers.
Solution Approach 2:
The patent changes the detection parameter from temperature (thermal effect) to electrical capacitance (electrical field effect). The capacitive sensor circuit measures changes in capacitance caused by the position of the reflecting optical unit, providing a detection mechanism that is independent of thermal effects and works with all laser types including ultrashort pulse lasers.
2Object-affected harmful factors
If the reflecting optical unit is swung into the beam path to interrupt the laser beam, then safety is improved, but the risk of the unit coming away from the holding arm increases
Solution Approach 1:
The patent implements a feedback mechanism where the capacitive sensor circuit continuously monitors the position of the reflecting optical unit on the holding arm. When the sensor detects that the optical unit has moved away from its expected position (indicating potential detachment), it triggers an evaluation device to switch off the laser light source, providing real-time safety feedback.
Solution Approach 2:
The patent performs preliminary detection of the reflecting optical unit's position using the capacitive sensor before a defect can cause dangerous laser radiation escape. The evaluation device is configured to switch off the laser light source upon detecting abnormal position changes, preventing harm before it occurs.
3Reliability
If a sensor component is arranged between the reflecting optical unit and the holding arm, then defect detection capability is improved, but device complexity increases
Solution Approach 1:
The patent uses the holding arm itself as an intermediary element that serves both mechanical support and capacitive sensing functions. The sensor circuit utilizes the holding arm as part of the capacitive sensor, eliminating the need for separate complex sensing structures and reducing overall device complexity while maintaining detection capability.
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 effectively prevents dangerous laser radiation escape by reliably detecting defects in the reflecting optical unit, ensuring operational safety and preventing damage, even with ultrashort pulse lasers that do not generate significant heat.
Implementation Method 1
a sensor circuit with at least one sensor component arranged between the reflecting optical unit and the holding arm
Data Source
AI summary
A beam shutter is for a laser beam. The beam shutter includes: a reflecting optical unit configured to deflect the laser beam; a holding arm, which is capable of being brought into a release position and a shut-off position and on which the reflecting optical unit is held; a sensor circuit with at least one sensor component arranged between the reflecting optical unit and the holding arm; and an evaluation device, which is configured to interact with the sensor circuit, at least in the shut-off position of the holding arm.