Automated Beam Alignment for Reflective Detectors
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Solution Overview
Problem
Manual alignment of reflective-type beam detectors is inefficient and prone to errors, as it is difficult to ensure the beam is correctly aligned with the reflector, leading to instability and increased false alarms due to environmental movement.
Innovation Solution
An automated method for aligning a projected beam on a reflector, involving a flat, wide beam that illuminates the entire reflective surface, with incremental adjustments along altitudinal and lateral axes to center the beam and detect the reflector's shape, reducing the risk of misalignment and false alarms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual alignment is used, then the alignment process can be completed, but it is slow and prone to errors leading to misalignment
Solution Approach 1:
The system performs self-alignment through automated feedback mechanisms. The controller automatically adjusts the transmitter or reflector positioning based on real-time beam position detection, eliminating the need for manual intervention and ensuring consistent alignment accuracy without human error.
Solution Approach 2:
The system implements continuous feedback by monitoring the beam position on the reflector and automatically adjusting the alignment. The controller receives position data from detectors and modifies transmitter or reflector positions accordingly, creating a closed-loop system that maintains precise alignment.
2Reliability
If manual alignment is used, then the process can be completed, but it is easy to achieve wrong alignment leading to false alarms
Solution Approach 1:
The system automatically monitors and corrects alignment deviations, ensuring long-term stability. The continuous feedback mechanism detects when the beam drifts from the optimal position and automatically readjusts, maintaining reliable operation without requiring operator skill or intervention.
Solution Approach 2:
The patent replaces manual mechanical alignment procedures with automated optical and electronic systems. Beam position detectors and computer-controlled positioning mechanisms substitute for human operators, eliminating the variability and errors inherent in manual alignment while improving both reliability and ease of operation.
3Measurement precision
If laser targeting is used, then wrong alignment is reduced, but it does not guarantee correct alignment of transmitter and receiver
Solution Approach 1:
The system implements multi-stage feedback verification. After initial laser targeting, the infrared transmitter alignment is verified by detectors that measure the actual beam position on the reflector. The controller uses this feedback to make fine adjustments, ensuring that both transmitter and receiver are correctly aligned with the reflector, not just the laser.
Solution Approach 2:
The patent introduces intermediate verification steps between laser targeting and final alignment confirmation. Beam position detectors act as intermediaries that measure the actual infrared beam position and provide data to the controller, which then makes corrective adjustments. This intermediary measurement system bridges the gap between laser targeting and guaranteed correct alignment.
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 automated alignment method significantly reduces the time and errors in beam alignment, ensures accurate centering of the beam on the reflector, minimizes false alarms, and provides long-term stability by accounting for environmental movement.
Implementation Method 1
The transmitter projects a beam, in this example an Infrared (IR) beam, on to the retro-reflector which reflects the IR beam along the same axis back to the receiver
Implementation Method 2
Smoke in the beam path will reduce the amount of light returning to the receiver
Data Source
Figure 1~2
Figure 3a~4
Figure 5a~5i
AI summary
A method for aligning a projected beam on a reflector in a reflective-type beam detector, the method comprising: adjusting the projected beam so as to: project on to substantially all, if not all, of a reflective surface of the reflector; or project on to at least a portion of a reflective surface of the reflector until a constant, or within a predetermined threshold of a constant, signal is received from the reflector; and detecting one or more edges of the reflective surface of the reflector and thereby: centreing the projected beam, so as to align an approx. centre of the projected beam on, or within a predetermined threshold of, an approx. centre of the reflective surface of the reflector; and/or determining a shape or profile of the reflector.