Fibre Installation Detection via Reflected Light Monitoring
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Solution Overview
Problem
The existing methods for installing optical fibre units into conduits are labor-intensive and require multiple operators, as they rely on manual detection of air flow and fibre arrival at the remote end, which can be inaccurate due to conduit mapping errors, obstructions, and attenuation issues, especially in long fibre lengths.
Innovation Solution
A method and device that allow a single operator to detect the arrival of the fibre unit at the remote end by introducing light into the fibre and using a light detector to monitor reflected light, which decreases when the fibre end is immersed in an index-matching fluid, eliminating the need for a second operator and reducing the risk of fibre misplacement or obstruction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual detection methods are used to detect air flow and fibre arrival at the remote end, then installation can be performed with existing equipment, but the process requires multiple operators and is labor-intensive
Solution Approach 1:
The patent replaces manual mechanical detection methods with an automated optical detection system. A light source transmits light through the fibre, and a light detector automatically monitors reflected light to detect fibre arrival, eliminating the need for manual air flow detection and reducing labor requirements while improving installation efficiency
Solution Approach 2:
The system implements automatic feedback through the light detector that continuously monitors reflected light from the fibre end. When the fibre arrives at the remote end, the change in reflected light provides automatic feedback to indicate arrival, eliminating the need for manual detection and enabling a single operator to manage the installation
2Measurement precision
If manual air flow detection is used at the remote end, then no additional detection equipment is needed, but detection accuracy is compromised due to conduit mapping errors and obstructions
Solution Approach 1:
The patent replaces manual air flow detection with an optical detection system that uses light transmission and reflection principles. The light detector automatically measures reflected light changes to precisely detect fibre arrival, eliminating errors from manual detection while maintaining system simplicity through the use of standard optical components
Solution Approach 2:
The patent introduces light as an intermediary to detect fibre arrival. By transmitting light through the fibre and monitoring reflected light, the system creates an indirect but accurate measurement of fibre position, avoiding the inaccuracies of direct manual detection methods
3Measurement precision
If light transmission through the fibre is used to detect fibre arrival, then accurate detection can be achieved, but light attenuation becomes an issue in long fibre lengths
Solution Approach 1:
The patent converts the harmful effect of light attenuation into a beneficial detection mechanism. By monitoring reflected light rather than transmitted light, the system uses the attenuation characteristics to detect fibre arrival - when the fibre reaches the remote end, the reflected light pattern changes in a detectable way, turning energy loss into a useful signal
Solution Approach 2:
Instead of detecting light transmitted through the fibre (which suffers from attenuation), the patent inverts the approach by detecting reflected light. This reversal allows the system to work against the attenuation gradient, using reflections that travel back toward the light source where detection sensitivity is highest
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 a single operator to confirm the correct conduit selection and fibre arrival at the remote end without additional personnel, improving installation efficiency and accuracy by monitoring air flow and fibre status in real-time, reducing the risk of fibre misplacement or obstruction.
Implementation Method 1
detecting reflected light in the fibre caused from reflection of the light on a cleaved end of the fibre with a light detector at the first end
Implementation Method 2
The index-matching fluid is configured to reduce reflected light in the fibre when the fibre end becomes immersed in the fluid
Data Source
Figure 1A~1B
Figure 2~3
Figure 4A~4B
AI summary
A method for use in connection with installing a fibre unit (10) into a conduit (8) having a first end (6) and a second end, the method being suitable to detect when the fibre unit introduced into the first end arrives at the second end, and comprising the steps of: introducing the fibre unit into the conduit from the first end and installing it towards the second end; introducing light with a light source (30) into the fibre unit at the first end; detecting reflected light in the fibre unit with a light detector (32) at the first end; and detecting changes in the reflected light, whereby an operator may determine that the fibre unit has arrived at the second end.