Dual Sensor Motion Detector With Angled PIR Configuration
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Solution Overview
Problem
Existing motion detection systems using microwave, ultrasonic, and passive infrared sensors face challenges with sensitivity, accuracy, and false reporting, and are often energy-inefficient and costly.
Innovation Solution
A motion detection system utilizing dual passive infrared sensors mounted in a weatherproof chassis, with each sensor rotated 5 degrees and separated by a predetermined distance, creating a dual coverage zone to enhance sensitivity and accuracy while reducing false reports, and allowing for networked coverage of larger areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If microwave sensors are used to detect motion, then sensitivity to movement and coverage area are improved, but energy consumption and cost increase
Solution Approach 1:
The patent divides the detection task into multiple passive infrared sensors working together in a network, where each sensor covers a specific zone. This segmentation allows the system to achieve comprehensive coverage and high sensitivity without requiring each individual sensor to consume high energy like microwave sensors would.
Solution Approach 2:
The patent uses multiple passive infrared sensors that replicate the detection function across different spatial zones. By copying the sensing capability across multiple low-energy sensors rather than using a single high-energy microwave sensor, the system achieves both sensitivity and energy efficiency.
2Use of energy by moving object
If passive infrared sensors are used to detect motion, then energy consumption and cost are reduced, but sensitivity and coverage area decrease
Solution Approach 1:
The patent merges multiple passive infrared sensors into a coordinated network system. By combining the detection capabilities of multiple sensors with overlapping coverage zones, the system achieves sensitivity and coverage comparable to microwave sensors while maintaining the energy efficiency of passive infrared technology.
Solution Approach 2:
The patent extends detection coverage by arranging sensors in spatial configurations with overlapping zones, effectively adding dimensional coverage. This multi-zone approach compensates for the narrower field of view of individual passive infrared sensors, achieving comprehensive area coverage without increasing individual sensor energy consumption.
3Device complexity
If single sensor motion detectors are used, then device complexity is reduced, but false reports increase and detection consistency decreases
Solution Approach 1:
The patent implements a networked system where sensors provide feedback to each other through coordinated detection. The system analyzes detection patterns across multiple sensors and zones, using this feedback to distinguish true motion events from false alarms, thereby improving reliability while maintaining manageable system complexity.
Solution Approach 2:
The patent pre-configures overlapping coverage zones and establishes detection criteria before operation. By setting up the spatial relationships and detection thresholds in advance, the system reduces false reports without requiring complex real-time analysis, thus maintaining ease of operation.
4Area of stationary object
If sensors are positioned to maximize coverage area, then detection capability is improved, but false detections increase due to broader detection zones
Solution Approach 1:
The patent assigns different functional qualities to different spatial zones covered by the sensors. By creating overlapping zones with specific detection criteria tailored to each area, the system can maximize overall coverage while maintaining low false detection rates through localized detection strategies in each zone.
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
The system consistently reports detected movement with reduced false reports, is low-cost and energy-efficient, and provides improved sensitivity and accuracy by utilizing dual passive infrared sensors, effectively covering larger areas with minimal maintenance.
Implementation Method 1
Passive infrared sensors are designed to detect infrared energy and triggers when the infrared energy detected is altered from a standard state
Data Source
AI summary
The present invention is a motion detection system that will consistently report detected movement, while reducing the number of false reports. The motion detection system includes a receiver and a dual sensor motion detector. The dual sensor motion detector utilizes sensors mounted in a weatherproof chassis. The dual sensors are located at the same vertical height in the weatherproof chassis and separated by a predetermined distance from the center of the chassis. Each sensor is rotated at an angle away from the center of the chassis. Each sensor has a coverage area dictated by its viewing angle (or field-of-view) and viewing distance. By utilizing dual sensors, a user can set the dual sensor motion detector to an AND operation or an OR operation. Motion is detected when both sensors detect movement simultaneously or motion is detected when any one of the two sensors detects movement.