Revolving Security Door Detection Using Sensor Arrays
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Solution Overview
Problem
Revolving security door systems face challenges in detecting objects without sufficient mass and objects adhered to the door or door wings, as well as covering the entire security zone effectively, which compromises the detection of prohibited items and unauthorized passage.
Innovation Solution
The implementation of an array of object detection sensors in the ceiling and floor of the doorway creates a detection 'curtain' to identify objects and persons attempting to pass through or adhere to the door, with sensors also mounted on door wings to prevent false signals, ensuring comprehensive coverage and activation of an alarm or locking mechanism when violations occur.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If mat type detection systems are used, then detection capability is provided, but objects without sufficient mass cannot be detected
Solution Approach 1:
The patent replaces mechanical mat-type detection systems with optical detection systems. Specifically, optical sensors (such as photoelectric sensors or light curtains) are used to detect objects by measuring light interruption or reflection, rather than relying on mechanical pressure from object mass. This substitution allows detection of lightweight objects that would not activate mechanical mats, directly resolving the contradiction between detection precision and minimum object mass requirements.
2Area of stationary object
If sensors are mounted only in ceiling and floor, then detection coverage is provided, but objects adhered to door wings cannot be detected
Solution Approach 1:
The patent segments the detection system into multiple sensor locations: ceiling-mounted sensors, floor-mounted sensors, and door-wing-mounted sensors. This segmentation allows comprehensive coverage of different zones - ceiling and floor sensors detect objects in the portal area, while door-wing sensors specifically detect objects adhered to or carried on the moving door wings. The segmented approach ensures both broad coverage area and high detection reliability by eliminating blind spots.
3Ease of operation
If revolving door structure is used, then security control is provided, but complete coverage of security zone is compromised
Solution Approach 1:
The patent adds a temporal dimension to the detection system by using multiple sensor positions that are activated at different times during the door's rotation cycle. Ceiling and floor sensors detect objects when the door is stationary or moving slowly, while door-wing sensors detect objects during active rotation. This multi-dimensional detection approach (combining spatial positions with temporal sequencing) enables complete security zone coverage while maintaining the ease of operation characteristic of revolving doors.
Data Source
AI summary
A revolving security door includes a drum defining a secure zone between door openings controlled by a revolving door disposed within the drum and wherein light curtain sensors and active infrared sensors may detect an intruder moving from a non-secure side of the doorway to the secure side and detect objects left behind in a secure zone. Methods of operation prevent persons or objects from passing from the non-secure side to the secure side of the doorway.