Tunable Optical Source Safety Curtain Cross-Talk Reduction
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Solution Overview
Problem
Existing safety equipment in factory environments, such as light curtains, face challenges in reducing complexity and cost while effectively preventing personal injury from machinery hazards, often experiencing issues with cross-talk and increased costs due to multiple sources emitting at the same wavelength.
Innovation Solution
A tunable optical source and optical splitter system that generates and separates light into unique wavelengths, reducing cross-talk and allowing for identical units in both transmit and receive configurations, thereby minimizing manufacturing costs and enhancing reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple light sources emitting at the same wavelength are used in light curtains, then the safety coverage area is improved, but cross-talk between channels increases and system complexity increases
Solution Approach 1:
The patent applies parameter changes by tuning the wavelength of light sources to unique values for each channel. Instead of using multiple sources at the same wavelength, each transmitter uses a light source with a specifically tuned wavelength that is unique to that channel, eliminating cross-talk while maintaining comprehensive safety coverage across multiple beams.
Solution Approach 2:
The patent implements local quality by assigning different wavelength characteristics to different spatial channels. Each light curtain beam is characterized by a unique wavelength tailored to that specific channel, allowing the system to maintain simple receiver design while achieving multi-channel operation without interference.
2Area of stationary object
If multiple light sources at the same wavelength are used, then safety coverage is improved, but manufacturing cost increases
Solution Approach 1:
The patent reduces manufacturing cost by changing the wavelength parameter of light sources rather than requiring complex filtering or synchronization systems. Each transmitter uses a cost-effective light source tuned to a unique wavelength, eliminating the need for expensive wavelength-selective filters or complex electronic synchronization infrastructure.
3Area of stationary object
If multiple light sources emitting at the same wavelength are used, then safety coverage is improved, but reliability decreases due to cross-talk
Solution Approach 1:
The patent enhances reliability by changing the wavelength parameter to create unique spectral signatures for each channel. This physical parameter differentiation fundamentally eliminates cross-talk interference, ensuring that each receiver only detects its corresponding transmitter's signal, thereby大幅提高 system reliability in multi-channel safety coverage applications.
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 reduces cross-talk and manufacturing costs by using a single tunable light source with an optical splitter to create unique wavelength channels, improving safety and reliability in safety curtain applications.
Implementation Method 1
Each transmit unit is assigned a unique wavelength to which its corresponding receive unit is tuned
Implementation Method 2
an optical splitter to separate the light into a plurality of wavelengths, each wavelength corresponding to a different transmit unit
Data Source
AI summary
Apparatus and methods for using a tunable optical source in safety curtain applications provide for enhanced operation of the safety curtain. In an embodiment, a safety curtain includes a transmit unit and a receive unit to operate as the safety curtain, where a single tunable light source generates different wavelengths of light and a single detector is used to detect the generated light.