Touchless Motion Sensor Directional Detection Logic
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Solution Overview
Problem
Existing touchless motion sensor systems for directional detection and access control in environments like hospitals and public areas face challenges in maintaining hygiene and efficient operation, particularly in accurately detecting directional motion and controlling access without requiring users to touch control surfaces.
Innovation Solution
A touchless motion sensor system comprising two sensors separated by a predetermined distance along a predefined axis, with each sensor unit having a disable input and output, and motion logic that uses flip flops to ensure only one sensor's output is active at a time, enabling directional detection and access control by activating or deactivating the control barrier based on sensed motion and time intervals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single touchless motion sensor is used, then the system is simple and easy to operate, but it cannot accurately detect directional motion
Solution Approach 1:
The system divides the motion detection function into multiple independent sensor units arranged in an array. Each sensor detects motion in its specific zone, and by comparing outputs from multiple sensors, the system determines directional motion. This segmentation enables accurate directional detection while keeping each individual sensor unit simple.
Solution Approach 2:
Multiple sensor outputs are merged and processed together through logic circuits that combine the signals from all sensor units. The merged information allows the system to determine both the presence and direction of motion, achieving high measurement precision through the combination of multiple simple sensor elements.
2Reliability
If motion detection is enabled in both sensing units simultaneously, then the system responds to all motion, but it causes false triggering and cannot distinguish motion direction
Solution Approach 1:
The system dynamically enables or disables specific sensor units based on detected motion patterns. When motion is detected in one direction, the system enables sensors in that direction and disables others, allowing accurate directional detection while maintaining system responsiveness. This dynamic control prevents false triggering while preserving efficient motion response.
Solution Approach 2:
The system uses feedback from sensor outputs to control the enabling/disabling state of sensing units. When a sensor detects motion, it provides feedback that triggers the enable/disable logic to activate appropriate sensors and inhibit others, creating a self-regulating system that accurately tracks motion direction while preventing false triggers.
3Measurement precision
If the first sensing unit is enabled continuously, then it can detect all approaching motion, but it cannot determine when motion is directed away from the controlled space
Solution Approach 1:
The system preliminarily enables the first sensing unit to detect approaching motion before motion actually occurs in the controlled space. When motion is detected, the system takes preliminary action to enable the second sensing unit in advance, allowing it to detect motion directed away from the space. This preliminary enabling strategy ensures both directions of motion can be detected without requiring complex continuous monitoring of multiple units.
Data Source
AI summary
A touchless motion sensor system for performing directional motion detection includes first and second touchless motion sensors. First and second sensing units are coupled to the first and second touchless motion sensors each having a sensing unit disable input, a sensing unit disable output, a sensing unit to sensing unit motion detected output, and motion logic. The first sensing unit disable output is coupled to the second sensing unit disable input, and the second sensing unit disable output is coupled to the first sensing unit disable input.