Infrared Motion Detector Radial Movement Accuracy
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Solution Overview
Problem
Passive infrared motion detectors have differing detection accuracies for radial and tangential movements, with radial movements often being harder to detect due to the size of the perceived object and typical sensor resolutions.
Innovation Solution
A motion detection device with multiple infrared sensors and an optical element that divides the detection area into a long-range and a close-range area, using a mirror or lens to ensure that objects in the close range are imaged on at least two sensors, allowing for improved detection of radial movements by generating distinct signal responses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single infrared sensor is used for motion detection, then the device structure is simple, but the detection accuracy for radial movements is poor
Solution Approach 1:
The detection area is segmented into multiple zones using an optical element (lens or mirror) that divides the field of view into a first detection area and a second detection area. The first infrared sensor detects movements in the first detection area while the second infrared sensor detects movements in the second detection area, allowing radial movements to be detected through multiple segmented zones rather than a single sensor.
2Measurement precision
If the detection range is divided into multiple areas with separate sensors, then radial movement detection is improved, but the device complexity increases
Solution Approach 1:
An optical element (lens or mirror) is introduced as an intermediary component to divide the detection area into multiple zones. This optical element redirects infrared radiation from different spatial areas to appropriate sensors, enabling the system to detect radial movements effectively without requiring complex sensor arrangements or processing.
3Measurement precision
If infrared radiation is directed to multiple sensors through an optical element, then detection precision is enhanced, but the device complexity increases
Solution Approach 1:
The optical system segments the incoming infrared radiation into distinct spatial zones using a lens or mirror, directing each zone to a dedicated infrared sensor. This segmentation allows the system to maintain high detection precision by analyzing temperature changes in multiple separate detection areas simultaneously, rather than relying on a single sensor with complex processing.
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 configuration enhances the detection accuracy for radial movements to match that of tangential movements, enabling the detection of smaller objects and slight fluctuations in infrared radiation, thereby improving overall detection precision.
Implementation Method 1
The optical element directs IR radiation from the detection area of the motion detection device onto the IR sensors
Implementation Method 2
The optical element directs IR radiation from the detection area of the motion detection device onto the IR sensors
Implementation Method 3
Passive infrared sensors (PIR sensors) are used as motion detectors... detect the heat radiated by an object in the sensor's field of view in the form of infrared radiation
Data Source
Figure 1A~1C
Figure 2A~2B
Figure 3A~3D
AI summary
A motion-detecting device (100) comprises a plurality of infrared sensors (110) for detecting motion and an optical element (120), which is suitable for directing infrared radiation incident on the motion-detecting device (100) at the infrared sensors (110). The optical element (120) divides a detection region (130) of the motion-sensing device (100) into a far region (132) and a near region (136). The fields of vision of the infrared sensors (110) in the far region (132) are spatially separated from each other, while fields of vision of at least two infrared sensors (110) in the near region (136) overlap.