Laser Protective Wall Element with Hot Conductor Monitoring
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Solution Overview
Problem
Existing laser protective equipment in machining stations lacks reliable and cost-effective solutions for real-time monitoring and secure deactivation of laser radiation, often requiring complex and expensive repairs, and does not ensure 100% security against laser penetration.
Innovation Solution
A laser protective wall element with an intermediate layer exhibiting hot conductor properties, which increases electrical resistance at room temperature and decreases at higher temperatures, allowing for real-time monitoring and deactivation of the laser upon detecting a temperature increase from a laser incident, using a measurement circuit and electronic evaluation unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If passive protective equipment (wall elements) is used, then protection against laser radiation is provided, but penetration can occur and only visual examination can be performed subsequently, causing high effort and expense with no 100% security
Solution Approach 1:
The patent replaces the mechanical/visual inspection system with an electrical monitoring system. The intermediate layer with hot conductor properties changes its electrical resistance when heated by laser penetration, allowing automatic detection and alarm without manual visual examination.
Solution Approach 2:
The patent implements a feedback mechanism where the electrical resistance of the intermediate layer continuously monitors the protective wall's integrity. When laser radiation penetrates and heats the intermediate layer, the resistance change triggers an alarm signal, providing real-time feedback on protection status.
2Reliability
If sufficiently secure protective walls are manufactured with high use of material, then protection security is improved, but cost increases
Solution Approach 1:
The patent uses a composite structure consisting of electrically conductive plate-like elements with an intermediate layer having hot conductor properties. This composite design provides both protection and automatic detection functionality without requiring excessive material thickness.
Solution Approach 2:
The patent exploits the temperature-dependent electrical resistance parameter of the intermediate layer. At room temperature, the layer has high resistance, but when heated by laser penetration, its resistance decreases significantly, enabling detection without increasing material quantity.
3Reliability
If electrical conductors are formed between layers for active protective equipment, then laser penetration can be detected, but the system becomes complex and expensive, and gaps cannot be avoided which is critical for high-power lasers
Solution Approach 1:
The patent applies the hot conductor property locally to the intermediate layer rather than using extensive electrical conductor networks. The intermediate layer itself becomes the sensor, eliminating the need for separate conductor traces and reducing gaps and complexity.
4Reliability
If destruction of protective equipment is necessary to determine danger, then detection is possible, but the system is no longer operable after detection and requires replacement or expensive repair
Solution Approach 1:
The intermediate layer serves dual functions: it acts as both the protective barrier and the detection sensor. When heated by laser penetration, it automatically signals the danger through resistance change, enabling continuous operation and monitoring without requiring replacement after detection.
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
Enables continuous monitoring and secure deactivation of lasers, reducing the need for frequent repairs and ensuring enhanced protection against laser radiation with minimal loss of functionality even if the intermediate layer is damaged.
Implementation Method 1
The intermediate layer in this respect has hot conductor properties. This means that the specific electrical resistance is considerably higher at lower temperatures, that is, in the range of common room temperatures or environmental temperatures, than at temperatures which are higher in comparison.
Implementation Method 2
If a laser beam is incident on one of the plate-like elements, the coating, the layers or a support element, a heating occurs, which is admittedly locally limited, which can lead up to and into a temperature range of approximately 600° C. and beyond.
Implementation Method 3
The specific electrical resistance is reduced in this region of the housing and the electrical current increases accordingly
Data Source
AI summary
A laser protective wall element for a housing in laser machining stations with which increased protection, in particular for the eyes of living beings, can be achieved. In a laser protective wall element for a housing at laser machining stations, an intermediate layer is present which has hot conductor properties. The intermediate layer can be formed between electrically conductive plate-like elements, an electrically conductive plate-like element and an electrically conductive coating or also two electrically conductive layers or can be arranged there. The electrically conductive plate-like elements, the coating and/or the layers are connected to an electrical voltage source as well as a measuring instrument which detects electrical current, electrical resistance and/or electrical capacity and whose measured signal change can be used for the condition monitoring of the laser protective wall element.