PIR Sensor Direction Detection Using Segmented Tunnel Housing
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Solution Overview
Problem
Existing direction detection devices in passages face challenges in accurately determining the direction of passage while minimizing unwanted detections and maintaining a compact design, particularly in narrow spaces.
Innovation Solution
The device features a slot-shaped tunnel housing with PIR sensors and viewing windows, limiting the detection zone to ensure IR radiation hits the sensors at a 90-degree angle, reducing unwanted detections and allowing for time-delayed direction determination with non-overlapping detection areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the detection area of PIR sensors is expanded to improve detection capability, then more individuals can be detected, but false detections from unwanted IR radiation increase
Solution Approach 1:
The detection area is segmented into multiple independent detection zones, each assigned to a specific PIR sensor. The housing structure divides the space into distinct regions using partition walls, so that each sensor monitors a specific segment. This segmentation allows the system to detect multiple individuals while reducing false detections by isolating each sensor's detection area from unwanted IR radiation sources.
Solution Approach 2:
Each detection zone is optimized with local structural features including transparent viewing windows positioned at specific angles, slot-shaped openings, and partition walls that control the direction of IR radiation. These local quality adjustments ensure that each PIR sensor receives IR radiation primarily from its intended detection direction while blocking radiation from other directions, thereby improving detection reliability and reducing false positives.
2Volume of moving object
If multiple PIR sensors are arranged close together to achieve compact design, then the device fits narrow passages, but detection areas overlap causing detection errors
Solution Approach 1:
The housing structure incorporates partition walls and separate viewing windows for each PIR sensor, creating distinct detection zones even when sensors are positioned close together. This segmentation prevents overlap of detection areas and allows accurate direction detection while maintaining a compact form factor suitable for narrow passages.
Solution Approach 2:
The viewing windows are positioned asymmetrically at different angles relative to each PIR sensor, and the detection zones are shaped differently to match the specific directional requirements of each sensor. This asymmetric arrangement ensures that each sensor's detection area is optimized for its specific position and orientation, preventing overlap and improving direction detection accuracy in the compact design.
3Object-affected harmful factors
If the detection zone is limited using structural boundaries to reduce detection area, then false detections are reduced, but the detection range is restricted
Solution Approach 1:
The detection space is segmented into multiple specialized zones, each optimized for specific detection requirements. While each individual zone has a limited range, the collective coverage of all segmented zones provides comprehensive detection capability. The segmentation allows the system to reduce false detections in each zone while maintaining overall detection range through the combination of multiple sensors with different detection orientations.
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 design enhances direction detection accuracy, reduces false triggers, and allows for easy installation in narrow passages by limiting the detection area to the passage frame, while also providing information on the number of individuals passing through.
Implementation Method 1
a first PIR sensor and a second PIR in the housing and each with a viewing window transparent to infrared radiation in the detection area
Implementation Method 2
A PIR sensor in the sense of the present invention is understood to mean any type of sensor that emits infrared radiation, i.e. H. Thermal radiation detected
Data Source
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AI summary
A device (1) for direction detection in passageways with a housing (2) is described. The housing (2) has a first PIR sensor (3) and a second PIR sensor (4), and each has a viewing window (5) transparent to infrared radiation in front of the PIR sensors (3, 4). The housing (2) has a detection zone (7) between each of the PIR sensors (3, 4) and the viewing window (5) of the PIR sensor (3, 4) to reduce the detection range (8).