Infrared Radar Detection Device with Dynamic High-Pass Filter
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Solution Overview
Problem
Infrared motion detection systems face issues with false detections due to environmental variations like solar radiation and air currents, and microwave detection consumes excessive energy, reducing the operating time of battery-powered devices.
Innovation Solution
A battery-powered detection device combining an infrared detector with a radar interface featuring a high-pass filter, where the power supply is activated only when a passage is detected, and the filter's time constant is reduced temporarily to minimize energy consumption and stabilize the signal quickly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the microwave interface is continuously powered to ensure reliable detection, then the detection reliability is improved, but the energy consumption increases
Solution Approach 1:
The microwave interface is powered periodically rather than continuously. The system activates the microwave interface only during specific detection periods triggered by infrared motion detection, and deactivates it during idle periods. This periodic operation maintains detection reliability when needed while significantly reducing overall energy consumption for battery-powered operation.
2Reliability
If the time constant of the high-pass filter is increased to filter out low-frequency noise, then the noise filtering is improved, but the response time increases
Solution Approach 1:
The time constant of the high-pass filter is made dynamic rather than fixed. The system adjusts the time constant based on operational conditions: using a longer time constant during stable detection periods for better noise filtering, and switching to a shorter time constant when rapid response is needed. This dynamic adjustment allows the system to optimize both noise filtering and response time according to situational requirements.
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 solution significantly reduces energy consumption, allowing for a longer operating time and reliable detection of individual passages while minimizing false alarms, ensuring the device remains reactive and efficient.
Implementation Method 1
Infrared motion detection is conventionally used. Infrared detectors are placed inside or outside a building.
Implementation Method 2
the microwave interface comprising at least one high-pass filter, the at least one high-pass filter having a time constant to filter a signal delivered by the radar
Data Source
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AI summary
The present invention relates to a method and a device for detecting the passage of an individual comprising an infrared detector, a radar linked to a microwave-frequency interface, the microwave-frequency interface comprising at least one high-pass filter, in which method and device: an electrical power supply of the microwave-frequency interface is activated (E400, E401) when the passage of an individual is detected by the infrared detector, the time constant of the at least one filter is reduced (E403, E404) for a first predetermined duration, the reduced time constant is modified (E405) when the first predetermined duration has elapsed, the passage of an individual is confirmed (E410) by the microwave-frequency interface, the electrical power supply of the microwave-frequency interface is deactivated (E412) after confirmation of detection of the passage of an individual and/or after the end of a timeout activated upon the activation of the electrical power supply of the microwave-frequency interface.