Multi-jet Reflection Light Grid with Automatic Signal Calibration
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Solution Overview
Problem
Conventional multi-beam reflection light grids face reliability issues in detecting objects, especially with sensitivity adjustments and thermal drifts, leading to incomplete detection and high maintenance needs.
Innovation Solution
A multi-beam reflection light grid with a transmitter-receiver unit and a control and evaluation unit that automatically adjusts light transmitters and receivers to maintain a target output signal, using a polarization filter and contrast detection to ensure reliable object detection and reduce maintenance intervals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If manual adjustment via potentiometers is used for sensitivity and multi-beam reflection light grid settings, then device complexity is reduced, but detection reliability deteriorates due to incorrect settings and thermal drifts
Solution Approach 1:
The system performs self-adjustment through automatic calibration routines that compensate for thermal drifts and aging effects without manual intervention. The control unit continuously monitors detector signals and automatically adjusts sensitivity parameters to maintain optimal detection performance throughout operation.
Solution Approach 2:
The system implements feedback mechanisms where detector signals are continuously monitored and fed back to the control unit, which then adjusts the light transmitters and detectors accordingly. This closed-loop control ensures maintained detection reliability despite environmental changes or component aging.
2Reliability
If multiple separate light sources are used in the multi-beam reflection light grid, then detection coverage is improved, but device complexity and cost increase
Solution Approach 1:
A single light source is divided into multiple beams using optical elements such as diffraction gratings or beam-splitting optics. This segmentation approach creates multiple detection zones with separate detectors while maintaining a single light source, thereby improving detection coverage without proportionally increasing device complexity or cost.
Solution Approach 2:
The single light source serves multiple functions by generating multiple beams that cover different detection zones simultaneously. This multi-functionality allows the system to achieve comprehensive detection coverage while minimizing the number of required light sources, reducing overall system complexity.
3Ease of operation
If the light grid operates without automatic readjustment, then ease of operation is improved, but maintenance frequency increases due to aging and performance degradation
Solution Approach 1:
The system automatically compensates for aging and performance degradation through continuous self-calibration routines. The control unit monitors detector performance and automatically adjusts operational parameters to maintain optimal detection sensitivity throughout the component service life, extending effective operational lifespan without requiring manual maintenance.
Solution Approach 2:
Feedback loops continuously monitor the performance of light transmitters and detectors, automatically adjusting operational parameters to compensate for aging effects. This ensures the system maintains reliable detection performance throughout its intended service life without increasing maintenance frequency.
4Measurement precision
If the output signal level is reduced to extend dynamic range, then measurement precision is improved, but detection sensitivity deteriorates
Solution Approach 1:
The system dynamically adjusts operational parameters including light transmitter power and detector gain based on detected signal levels. When objects are detected, the system modifies parameters to optimize the balance between signal resolution and detection sensitivity, ensuring both precision measurement and reliable detection across varying conditions.
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 solution enhances detection reliability and flexibility, providing gapless detection of objects with undefined edges and reducing maintenance needs by automatically readjusting the system to maintain a consistent output signal over time.
Implementation Method 1
A reflector is arranged opposite the transmitter-receiver unit for delimiting the surveillance area and for reflecting the light of the light transmitters back towards the receiver or receivers
Implementation Method 2
at least one receiver for detecting light coming from the monitored area
Data Source
Figure 1~3
Figure 4~5
AI summary
The grid has a control and evaluation unit (18) for outputting an object identification signal based on light intensities detected by a receiver (11). The control and evaluation unit automatically provides a predetermined output reference signal of the receiver and/or a predetermined sum of output signals of the receiver. The unit outputs the identification signal when the output signals of the receivers and the sum of the output signals of the receiver is smaller than a preset portion of the output reference signal. An independent claim is also included for a method for operating a multi-jet reflection light grid.