Optical Sensor Beam Speed Asynchrony for Interference Reduction
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Solution Overview
Problem
Existing optical sensors used for object detection in surveillance areas often experience mutual interference when multiple sensors are deployed, leading to incorrect object detection signals due to synchronized beam operations, which compromises their functional reliability.
Innovation Solution
The solution involves operating the beam guidance means of each sensor at different speeds, using a setup mode to select and secure the speed through a speed index or vector, ensuring that interference signals are asynchronous and identifiable across multiple scans, thereby increasing detection reliability by masking out false detections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple optical sensors are deployed in the surveillance area, then the monitoring coverage is improved, but mutual interference between sensors occurs leading to incorrect object detection signals
Solution Approach 1:
The patent applies the dynamics principle by making the rotational speed of the beam guidance means variable and sensor-specific. Each sensor operates at a uniquely assigned rotational speed that can be dynamically adjusted during setup mode, transforming the static synchronized operation into dynamic asynchronous operation to eliminate mutual interference while maintaining comprehensive monitoring coverage
Solution Approach 2:
The patent implements parameter changes by modifying the rotational speed parameter of the beam guidance means for different sensors. During setup mode, each sensor is assigned a specific rotational speed from a predefined set, changing the operational parameters to ensure asynchronous beam operations and prevent interference signals from being misinterpreted as valid object detections
2Ease of operation
If the beam guiding means operates at a fixed rotational speed, then the operation is simple, but interference signals from multiple sensors synchronize leading to false object detections
Solution Approach 1:
The patent applies segmentation by dividing the operational parameters into distinct segments - specifically, assigning different rotational speed segments from a predefined set to different sensors. This segmentation ensures that while each sensor operates independently at its assigned speed, the overall system maintains coordinated operation through the structured parameter assignment, balancing simplicity with reliability
Solution Approach 2:
The patent utilizes periodic action through the rotational operation of the beam guidance means at assigned periodic intervals. By setting different rotational periods for different sensors during setup mode, the system creates asynchronous periodic actions that prevent synchronized interference while maintaining the regular, predictable operation needed for reliable detection
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 approach significantly enhances the functional reliability of optical sensors by preventing mutual interference and ensuring accurate object detection, even in complex monitoring scenarios where multiple sensors are used.
Implementation Method 1
a transmitter (3) emitting light beams (2)
Implementation Method 2
Light beams reflected from an object return to the receiver
Implementation Method 3
a beam guiding means that performs a rotary movement so that the transmitted beams are periodically guided within the surveillance area during successive scans
Implementation Method 4
an evaluation unit in which an object detection signal is generated depending on received signals from the receiver
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
The invention relates to a sensor (1) for detecting objects (5) in a monitoring area, comprising a transmitter (3) emitting beams and a receiver (4) receiving beams, a beam guide that performs a rotary movement such that the beams are periodically guided within the monitoring area during successive scans (51, 52), and an evaluation unit in which an object detection signal is generated depending on the received signals from the receiver (4). Received signals from several scans (51, 52) are used to generate the object detection signal. In a setup phase, a rotational speed of the beam guide is selected, and in subsequent operating phases, during which object detections take place, the beam guide is operated at this rotational speed. The invention also relates to a corresponding method.