Light Curtain Wavelength Pairing to Prevent Guard Beam Confusion
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Solution Overview
Problem
Conventional light curtain safety systems fail to accurately distinguish between guard beam signals from different emitters, leading to potential false negatives when detecting foreign objects, especially transparent or reflective objects, which can result in unsafe operation of high-flux power beams.
Innovation Solution
The implementation of a light curtain system with emitters emitting distinct wavelengths, where each emitter and detector pair uses a specific wavelength combination, allowing the system to differentiate between guard beam signals and accurately detect blockages or intrusions, including transparent and reflective objects, by utilizing retro-reflectors and wavelength-specific filters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional light curtain systems use single wavelength emitters, then the system structure is simple, but the system cannot accurately distinguish between guard beam signals from different emitters, leading to false negatives
Solution Approach 1:
Each emitter in the light curtain system is assigned a distinct wavelength characteristic, creating local differentiation among identical components. This allows detectors to distinguish between signals from different emitters based on wavelength, resolving the false negative problem without requiring complete system redesign.
Solution Approach 2:
The system employs multiple wavelengths (analogous to different colors) for different emitters. By detecting the wavelength-specific signals, the system can identify which emitter's beam is blocked, thereby eliminating false negatives caused by inability to distinguish between emitters.
2Reliability
If the system uses transparent objects as test subjects, then the detection challenge increases, but conventional systems fail to detect these objects due to signal confusion
Solution Approach 1:
The system changes the wavelength parameter of the guard beam signals to create distinguishable characteristics. This allows transparent objects to be detected reliably because the wavelength-modulated signals maintain sufficient intensity even when partially transmitted through transparent materials, preventing false negatives.
3Measurement precision
If reflective objects are present in the beam path, then signal interference occurs, but conventional systems cannot differentiate between direct and reflected signals
Solution Approach 1:
Each emitter is assigned a unique wavelength signature, creating local quality differentiation. When reflective objects cause signal interference, the detector can identify the wavelength of the interfering signal and trace it back to its source emitter, enabling precise identification of signal origin and reducing harmful interference effects.
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
This approach enhances the safety and reliability of high-flux power beam systems by preventing false negatives and ensuring timely interruption of the power beam when foreign objects, including transparent or reflective ones, enter the beam path, thereby protecting against hazards.
Implementation Method 1
an optical emitter arranged to emit light at a first wavelength λ1 and a second wavelength λ2
Implementation Method 2
utilizing retro-reflectors and wavelength-specific filters
Implementation Method 3
utilizing retro-reflectors and wavelength-specific filters
Data Source
AI summary
A system to detect obstacles includes a power beam transmission circuit, a power beam reception circuit arranged to receive a power beam from the power beam transmission circuit, an emitter module, and a detector module arranged to distinguish between a first characteristic and a second characteristic. The emitter module includes a first emitter arranged to emit a first signal having the first characteristic, the first signal emitted in proximity to the power beam, and a second emitter arranged to emit a second signal having the second characteristic, the second characteristic different from the first characteristic, the second signal emitted in proximity to the first signal. The detector module includes a first detector arranged to respond to the first signal emitted by the first emitter, wherein the detector module is arranged to determine when an obstacle is in or near a line-of-sight transmission path between the first emitter and the first detector.