Passive Optical Module for Light Curtain Safety Systems
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional light curtain systems require extensive electrical wiring, making them costly and impractical for installation in areas with limited wiring availability, such as small manufacturing facilities, and they often suffer from reliability issues due to ambient light and reflective surfaces.
Innovation Solution
A light curtain protection system featuring a passive optical module that receives a light signal from an active optical module, using polarization control and collimating lenses to reflect the signal back to the active module, requiring only power for the active module, thus allowing installation in areas without electrical wiring and enhancing detection reliability with linear polarizers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional light curtain systems are installed, then safety protection function is provided, but installation cost and complexity increase due to extensive electrical wiring requirements
Solution Approach 1:
The patent extracts the power requirement from the optical barrier component, making it passive. The optical barrier receives light signals from the active module and reflects them back without requiring electrical power, thereby eliminating the need for extensive wiring while maintaining the safety protection function.
Solution Approach 2:
The patent introduces a passive optical barrier as an intermediary element that mediates between the active optical module and the detection system. This passive barrier reflects light signals without requiring power, serving as a simple intermediary that reduces wiring complexity while maintaining system functionality.
2Reliability
If conventional light curtain systems are installed, then safety protection function is provided, but installation flexibility decreases due to wiring availability constraints
Solution Approach 1:
The patent removes the electrical power requirement from the optical barrier, enabling installation in locations without electrical wiring availability. This extraction of the power dependency directly improves installation flexibility while maintaining the safety protection function.
3Measurement precision
If conventional light curtain systems are used, then detection function is provided, but detection reliability decreases due to ambient light and reflective surface interference
Solution Approach 1:
The patent applies polarization control specifically at the optical barrier location to differentiate the reflected light signal from ambient light. By controlling the polarization state of the reflected light, the system achieves local quality enhancement that improves detection precision while rejecting ambient light interference.
Solution Approach 2:
The patent uses polarization state changes as an optical property modification. The passive optical barrier imparts a specific polarization state to the reflected light, creating an optical signature that distinguishes the signal from ambient light, thereby improving detection reliability.
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 solution reduces installation and maintenance costs, increases flexibility in placement, and improves detection reliability by minimizing the impact of ambient light and reflective surfaces, providing a cost-effective and viable light curtain system in previously unsuitable environments.
Implementation Method 1
the polarization control module includes a half-wave plate aligned with the reflector to impart a first predetermined polarization to the reflected light signal
Implementation Method 2
The polarization control module includes optical elements, such as, for example, a linear polarizer, to receive the reflected light such that the optical elements polarizes the received reflected light signal
Implementation Method 3
a retroreflector reflects, through a collimating lens and an optical aperture, the light signal to be received by a receiver in the active optical module
Implementation Method 4
a retroreflector reflects, through a collimating lens and an optical aperture, the light signal to be received by a receiver
Data Source
AI summary
Apparatus and associated methods relate to a light curtain protection system having a passive optical module arranged to receive, from an active optical module, a light signal such that a reflector reflects, through a polarization control module, the light signal to be received by a receiver in the active optical module. In an illustrative example, the polarization control module includes a half-wave plate aligned with the reflector to impart a first predetermined polarization to the reflected light signal such that the reflected light signal corresponds to a second predetermined polarization when received by the receiver. The polarization control module includes optical elements, such as, for example, a linear polarizer, to receive the reflected light such that the optical elements polarizes the received reflected light signal to correspond to a predetermined polarization. In some examples, the light curtain protection system may advantageously require operating power only for the active optical module.