Area Monitoring Using Reflector Retroreflection
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Solution Overview
Problem
Current area monitoring systems using laser light face challenges in extending the monitoring distance safely due to the need for increased laser output, which can exceed safe limits and affect unintended areas, while maintaining accurate detection of intruders.
Innovation Solution
The system incorporates a reflector within the monitored area to retroreflect laser light back to the monitoring apparatus, allowing for detection based on light reception amounts rather than distance measurement, enabling monitoring over a greater distance without increasing laser output, and utilizing multiple reflectors to enhance detection reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the output of the laser light is increased to extend the monitoring distance, then the monitoring distance is improved, but the safety of the laser light may be compromised and persons outside the monitored area may be affected
Solution Approach 1:
A reflector is introduced as an intermediary element within the monitored area to reflect laser light back to the monitoring apparatus. This mediator enables extended monitoring distance by providing a return path for the laser light without requiring increased laser output, thereby maintaining safety while achieving the desired monitoring range extension
Solution Approach 2:
The monitoring system is divided into two functional zones: a first detection area for distance measurement and a second detection area for light reception amount comparison. This segmentation allows the system to use different detection methods for different spatial regions, enabling extended monitoring without increasing laser power
2Measurement precision
If the output of the laser light is increased to maintain accurate detection over greater distances, then the detection accuracy is improved, but the laser light may exceed safe output ranges
Solution Approach 1:
The reflector acts as a mediator that concentrates and redirects laser light, enabling the detection apparatus to receive sufficient light intensity for accurate measurement without requiring the laser source to operate at higher power levels that would compromise safety
Solution Approach 2:
The system uses feedback from light reception amount comparisons to determine object presence. By monitoring the reflected light intensity and comparing it against reference values, the system maintains detection accuracy over extended distances while keeping the laser output within safe limits
3Area of stationary object
If the laser light is radiated at higher output to monitor areas beyond 30 meters, then the monitoring range is improved, but the light scattering and energy attenuation become more significant
Solution Approach 1:
The reflector serves as an energy-preserving intermediary that captures scattered laser light and redirects it back to the detection apparatus, reducing energy loss and enabling monitoring of larger areas without proportionally increasing laser output
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 configuration allows for effective monitoring over a longer distance while ensuring safety by using existing laser output levels and increasing the likelihood of intruder detection through retroreflection and strategic reflector placement.
Implementation Method 1
The reflector 3 is provided within the area to be monitored and reflects the laser light radiated from the monitor apparatus towards the monitor apparatus
Data Source
Figure 1
Figure 2
Figure 3A~3B
AI summary
An area monitoring system (1) is configured to include a monitoring apparatus (2) and a reflector (3). The monitoring apparatus (2) includes a time-based detecting unit (10a) (i.e., a first detecting unit) that detects an intruder (5) at a scanning angle by measuring a distance to an object based on an elapsed time until reflected light is received, for a first detection area (R1). The monitoring apparatus (2) further includes a light reception amount-based detecting unit (10b) (i.e., a second detecting unit) that detects an intruder (5) at a scanning angle by comparing an actual light reception amount at a timing at which reflected light is received when radiated laser light is reflected by a reflector (3), and a light reception threshold (i.e., a reference light reception amount) set in advance, with a second detection area (R2) set farther than the first detection area (R1) as an area subjected to detection.