Fresnel Lens Boundary Sensing for Detection Range and Power
Solution Overview
Problem
Fresnel lens sensing systems face issues with dense disposition leading to reduced detection range and increased power consumption due to frequent unnecessary photography from over-sensing in monitoring applications.
Innovation Solution
The implementation of a Fresnel lens sensing method and system that utilizes a limited number of Fresnel lens units to monitor specific boundaries of a sensing area, rather than dense point monitoring, allowing for extended detection range and reduced power consumption by focusing on object entry and exit points.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If Fresnel lens units are densely disposed to achieve no blind area monitoring, then the coverage area is improved, but the monitoring distance is reduced and the area of each Fresnel lens is reduced
Solution Approach 1:
The patent divides the monitoring task into boundary-specific segments, with each Fresnel lens unit dedicated to detecting targets crossing a specific boundary. This segmentation allows each lens to be optimally sized for its specific function rather than diluting area across multiple overlapping coverage zones, thereby maintaining both comprehensive coverage and adequate monitoring distance.
Solution Approach 2:
The patent transitions from a two-dimensional dense grid arrangement to a boundary-oriented configuration that effectively utilizes the spatial dimension. By positioning lenses along the periphery and orienting them to detect boundary crossings, the system achieves comprehensive monitoring coverage without requiring dense central placement, thus preserving monitoring distance.
2Area of stationary object
If Fresnel lens units are densely disposed to achieve no blind area monitoring, then the coverage area is improved, but the system causes over-sensing with very slight motion resulting in frequent photographing and resource waste
Solution Approach 1:
The patent extracts the essential monitoring function to only what is necessary - detecting targets at boundaries. By removing redundant internal monitoring points, the system eliminates over-sensing of minor motions within the monitored area, reducing unnecessary photographing events and associated power consumption while maintaining effective coverage.
Solution Approach 2:
The patent applies different monitoring strategies to different spatial zones: boundary regions use Fresnel lens units for target detection, while internal regions rely on the imaging system. This local differentiation ensures that sensitive detection is applied only where necessary (at boundaries), reducing overall system power consumption while maintaining comprehensive monitoring capability.
3Quantity of substance
If Fresnel lens area is reduced due to dense disposition, then the number of units can be increased for better coverage, but the sensing distance and signal strength are reduced
Solution Approach 1:
The patent merges the functions of multiple small Fresnel lens units into fewer, larger units positioned at strategic boundary locations. This consolidation maintains the quantity of monitoring coverage through optimal placement while preserving the sensing distance and signal strength that larger lens areas provide, eliminating the need for densely packed small units.
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 enhances the detection range and reduces power consumption by optimizing the placement of Fresnel lens units to monitor boundaries, minimizing repetitive data and extending the effective monitoring area while maintaining efficient processing and cost-effectiveness.
Implementation Method 1
Fresnel lens sensing system combines Fresnel lens unit and sensing unit to form a signal sensing system, wherein the Fresnel lens sense optical signals
Implementation Method 2
the Fresnel lens sense optical signals, and the sensing unit receives signals
Data Source
AI summary
A sensing method and system for Fresnel lenses are disclosed, the system including a first Fresnel lens unit for sensing the signal of a target object crossing a first boundary of a sensing area, a second Fresnel lens unit for sensing the signal of a target object crossing a second boundary of the sensing area, a third Fresnel lens unit for sensing the signal of a target object crossing a third boundary of the sensing area, and a sensing unit for receiving and processing the sensed signals of the Fresnel lens units. The first and second Fresnel lens units are arranged on two sides of the third Fresnel lens unit. Furthermore, it is possible to add more Fresnel lens units above, below or around the Fresnel lens units. By monitoring the boundaries of the sensing area, the sensing method and system for the Fresnel lenses improve the insufficiency of the sensing area, reduce cost and save power consumption.