Passive Infrared Sensor Threshold Adjustment for Aging Compensation
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Solution Overview
Problem
Current PIR sensors lack sensitivity adjustment capabilities, making them unsuitable for varying application scenarios and suffer from sensitivity degradation due to lack of calibration, leading to inaccurate target detection.
Innovation Solution
A passive infrared sensor sensitivity adjustment device integrating a processing module, sensitivity control module, and sensing function adjustment module, which allows for sensitivity adjustment based on user needs and adapts to aging through a window fine-tuning mechanism, enabling multiple sensitivity levels and automatic calibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the sensitivity of PIR sensor is increased to detect targets at longer distances, then the detection range is improved, but the false detection rate increases due to sensitivity degradation over time
Solution Approach 1:
The patent implements dynamic sensitivity adjustment by allowing the threshold value to be modified based on operational conditions. The system can adapt the sensitivity threshold in real-time to compensate for sensor aging, ensuring consistent detection performance throughout the sensor's operational life without requiring replacement.
Solution Approach 2:
The patent incorporates a feedback mechanism where the system monitors sensor performance and automatically adjusts the threshold value based on detected patterns. This feedback loop enables the sensor to compensate for degradation by learning from its own operational history and adjusting its sensitivity accordingly.
2Measurement precision
If the sensitivity of PIR sensor is fixed at a high level for long-distance detection, then the detection range is improved, but the device complexity increases due to lack of adjustment capability
Solution Approach 1:
The patent transforms the fixed sensitivity parameter into a dynamic, adjustable parameter. Users can modify the threshold value according to specific application requirements, enabling the same sensor to perform optimally in both long-distance and short-distance detection scenarios without requiring multiple different sensor types.
Solution Approach 2:
The patent makes the PIR sensor universally applicable to multiple detection scenarios by providing adjustable sensitivity. A single sensor with adjustable threshold can serve various applications from close-range motion detection to long-range intrusion detection, eliminating the need for multiple specialized sensors.
3Reliability
If the threshold value is lowered to reduce false detections, then the false detection rate is reduced, but the detection response time increases for weak signals
Solution Approach 1:
The patent enables dynamic threshold adjustment based on the operational context. The system can raise the threshold to filter false detections during stable conditions and lower it to improve response speed when detection accuracy is critical, optimizing the balance between reliability and speed based on real-time needs.
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
Enables adjustable sensitivity for different scenarios, maintains high detection accuracy by adapting to aging, and enhances operational flexibility and integration with intelligent systems without significant cost increase.
Implementation Method 1
A PIR (passive infrared) sensor is a passive infrared sensor that does not emit infrared radiation but detects infrared radiation emitted by moving targets (such as humans and animals) to generate a sensing signal
Data Source
AI summary
A passive infrared sensor sensitivity adjustment device includes a processing module, a sensitivity control module and a sensing function adjustment module. The processing module receives an input signal and generates a sensitivity control signal accordingly. The sensitivity control module is connected to the processing module, receives the sensitivity control signal, and generates a sensitivity adjustment signal accordingly. The sensing function adjustment module is connected to the processing module and the sensitivity control module, and receives the sensitivity adjustment signal and a sensing signal generated by the passive infrared sensor. The sensing function adjustment module adjusts a preset threshold value according to the sensitivity adjustment signal, and compares the sensing signal with the preset threshold value to generate a voltage signal. The processing module generates a start signal according to the voltage signal to activate the target device or not generate the start signal according to the voltage signal.