Entry Detection Device Using Paired Light Marks With Error Codes
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Solution Overview
Problem
Existing entry detection systems face challenges in reliably detecting entries across boundaries, especially when light sources are off, and are susceptible to false entries due to dummy light sources, with delays in detection and difficulty in specifying the entry side.
Innovation Solution
An entry detection device employing paired light marks with time-varying light emission patterns and error detection codes, where one light mark is off when the other is on, using a light sensor to generate inspection values for secure and immediate detection of entries across boundaries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the light source is kept on constantly, then the entry detection reliability is improved, but the system becomes vulnerable to dummy light sources and security is worsened
Solution Approach 1:
The light sources are activated periodically rather than continuously, with each light source turning on and off in sequence. This periodic activation pattern makes it difficult for intruders to install dummy light sources that can consistently mimic the temporal emission patterns of all light sources, thereby maintaining detection reliability while preventing dummy light source attacks.
Solution Approach 2:
The system dynamically changes the activation state of light sources over time, with different light sources being activated at different time periods. This dynamic temporal pattern creates a complex detection scheme that adapts to prevent dummy light source deception, as dummies would need to replicate multiple different temporal patterns simultaneously.
2Object-affected harmful factors
If the light source is turned on and off in time-series patterns, then the dummy light source vulnerability is reduced, but the entry detection speed is worsened due to delays
Solution Approach 1:
The system pre-establishes temporal patterns for multiple light sources before detection is needed. When an intrusion occurs, the system can immediately compare the observed light pattern against these pre-defined patterns without requiring time-consuming analysis, thus maintaining security against dummy light sources while enabling rapid detection response.
Solution Approach 2:
The system uses multiple light sources that replicate the same temporal emission patterns across different spatial locations. This copying approach allows the system to maintain consistent detection criteria throughout the monitoring area, preventing dummy light sources from exploiting pattern variations while enabling fast detection through pattern matching.
3Object-affected harmful factors
If multiple light sources are used with time-varying patterns, then the anti-dummy light source capability is improved, but the device complexity is worsened
Solution Approach 1:
The system divides the light source array into multiple independent light marks, each controlled by simple on/off signals. This segmentation allows complex temporal patterns to be achieved through simple individual control of each light mark, reducing the overall system complexity while maintaining anti-dummy light source capability through the collective behavior of multiple segmented elements.
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
Enables secure and timely detection of entries without delays, preventing false entries and specifying the entry side, by comparing inspection values generated from light receiving signals with error detection codes.
Implementation Method 1
a light sensor which receives light from the plural first light marks and the plural second light marks and outputs a signal corresponding to the light
Data Source
AI summary
An entry detection device includes first light marks and second light marks. A control signal corresponding to a part of the first light marks is an error detection code of the control signal corresponding to the other part of the first light marks. A first inspection value is generated based on a first part of a light receiving signal corresponding to the other part of the first light marks. A second inspection value is generated based on a reverse bit string of a third part of the light receiving signal corresponding to a part of the second light mark paired with the other part of the first light marks. An entry is detected based on the first inspection value and the second inspection value.