Magnetic Field Sensor Beam Shutter for Laser Safety
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Solution Overview
Problem
High-power laser arrangements face challenges in reliably interrupting laser beams due to detachment of reflecting optical units, which can lead to safety hazards, as existing solutions require precise positioning and are difficult to detect accurately, especially at high laser powers.
Innovation Solution
A beam shutter system with a holding arm and a permanent magnet, where the magnet's magnetic field strength decreases upon heating, allowing for contactless and wear-free monitoring of the beam path closure, ensuring safe operation by switching off the laser if the magnetic field threshold is not met, preventing accidental beam exposure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If active decoupling is used at high laser powers, then the laser safety is improved, but the positioning precision requirement increases significantly
Solution Approach 1:
The patent replaces mechanical position detection (sensors, switches) with magnetic field detection. A magnetic field sensor detects the position of a magnetic element on the holding device, enabling contactless and wear-free monitoring of the beam path closure status.
Solution Approach 2:
The patent implements a feedback mechanism where the magnetic field sensor continuously monitors the holding device position and provides signals to the control unit, which can respond by adjusting the laser operation or alerting the operator to positioning issues.
2Measurement precision
If mechanical sensors are used to detect holding device position, then the positioning can be monitored, but wear and contact issues reduce reliability
Solution Approach 1:
The patent replaces mechanical position detection (sensors, switches) with magnetic field detection. A magnetic field sensor detects the position of a magnetic element on the holding device, enabling contactless and wear-free monitoring of the beam path closure status.
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 ensures reliable and safe interruption of high-power laser beams by detecting any loss or defect in the reflecting optical unit, preventing hazardous situations through automatic shutdown and maintaining beam path integrity without physical contact or wear.
Implementation Method 1
The permanent magnet generates a magnetic field, the strength of which decreases upon heating of the permanent magnet above a first limiting temperature
Implementation Method 2
A first magnetic field sensor is disposed on the main body... the permanent magnet generates a magnetic field
Implementation Method 3
A reflecting optical unit for deflecting the laser beam... the laser beam is deflected by the reflecting optical unit
Data Source
AI summary
A beam shutter for a laser beam includes a main body, a magnetic field sensor, a holding arm having release and closure positions, a reflecting optical unit and a permanent magnet producing a magnetic field having reduced strength upon heating above a limit temperature. The magnet is closer to the sensor in the closure than the release position. A controller deactivates a laser light source at reduced magnetic field measured by the sensor, when passing a predefined strength and/or gradient magnetic field threshold. A laser arrangement includes a laser light source and beam shutter. The laser beam strikes the reflecting unit in the closure position. An operating method includes bringing the holding arm into closure position, operating the laser light source, measuring magnetic field strength and/or gradient using the sensor, deactivating the laser light source when the magnetic field drops and passes the predefined magnetic field threshold.