Fiber Optic Web Edge Sensor Light Scattering Detection
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Solution Overview
Problem
Accurate web edge detection is challenging due to variations in web materials' gauge and opacity, affecting web guiding and handling systems, as existing technologies struggle to reliably control lateral and longitudinal motion of flexible web materials during processing.
Innovation Solution
A fiber optic web edge sensor system using a laser light source and a two-dimensional array of optical fibers to detect scattered light from the web edge, with photodiodes connected to the fibers to determine the web edge position, allowing for precise monitoring of web flutter and lateral movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional web edge detection methods are used, then the system can detect web position, but the detection accuracy deteriorates due to variations in web materials' gauge and opacity
Solution Approach 1:
The patent replaces traditional mechanical or contact-based web edge detection methods with an optical detection system using fiber optic strands and light scattering principles. This substitution eliminates the influence of material gauge and opacity variations on detection accuracy, as the optical system measures light scattering patterns rather than relying on electrical or mechanical properties that vary with material characteristics.
Solution Approach 2:
The invention changes the detection parameter from direct light transmission or reflection (which is affected by opacity) to light scattering angle and intensity distribution. By measuring how light scatters at different angles from the web edge, the system achieves consistent detection across materials with varying gauge and opacity, as scattering patterns are more consistent than direct transmission properties.
2Loss of information
If a sensor array detects all scattered light, then more information is captured, but measurement precision deteriorates due to inclusion of non-essential light portions
Solution Approach 1:
The patent extracts and isolates only the relevant portion of scattered light for measurement by using multiple fiber optic strands positioned at specific angles. Each strand captures light scattered at a particular angle, and by selectively positioning and orienting the strands, the system extracts only the light information that contains useful web edge position data, rejecting non-essential light portions that would degrade measurement precision.
Solution Approach 2:
The sensor array is segmented into multiple discrete fiber optic strands, each detecting light at different angles or positions. This segmentation allows the system to process light information from different spatial locations independently, enabling precise determination of web edge position by analyzing the spatial distribution of scattered light across the segmented sensor elements.
3Manufacturing precision
If more comprehensive web monitoring is implemented, then web handling quality improves, but device complexity increases
Solution Approach 1:
The fiber optic sensor array serves multiple functions simultaneously: it detects web edge position, monitors web lateral movement, and tracks web flutter. By using a single multi-functional optical sensor system rather than separate sensors for each measurement type, the invention achieves comprehensive web monitoring while minimizing device complexity.
Solution Approach 2:
The patent uses fiber optic strands as intermediary elements that translate complex light scattering patterns from the web edge into simple, processable signals. The fiber optics act as a mediator between the complex optical field and the detection system, simplifying the overall device architecture while enabling comprehensive web monitoring through their ability to guide and transmit light information efficiently.
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 accurate and precise web edge detection, reducing web guiding errors and improving the quality of processed web materials by directly measuring displacement and rejecting non-essential light, thus enhancing web handling operations.
Implementation Method 1
The edge of the web scatters the light
Implementation Method 2
a sensor array that detects a first portion of the light scattered from the edge of the web and rejects a second portion
Data Source
AI summary
A web edge sensor is disclosed. The web edge sensor has a light source directing light incident to an edge of a web. The edge of the web scatters the light and a sensor array that detects a first portion of the light scattered from the edge of the web and rejects a second portion to determine a position of the web edge.