Pyroelectric Infrared Sensor Lighting Control with Focusing Component
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Solution Overview
Problem
Pyroelectric infrared sensor products face challenges such as small sensing range, low sensitivity, and high cost, necessitating a balance between sensing distance, sensitivity, and cost.
Innovation Solution
A pyroelectric infrared sensor-based lighting control device with a focusing component having a specific angle between its curved surface structural portions and the central axis, allowing for overlapping detection regions with densely distributed sensors to enhance sensitivity and range, utilizing multiple pyroelectric infrared sensors to detect infrared signals effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single pyroelectric infrared sensor is used with a Fresnel lens, then the device structure is simple, but the sensing range is small and sensing sensitivity is low
Solution Approach 1:
The patent divides the detection task into multiple segments by using multiple pyroelectric infrared sensors (at least two) positioned at different focusing points on the focusing component. Each sensor covers a specific detection region, and their combined coverage creates overlapping regions that enhance sensing sensitivity through densely distributed detection points.
Solution Approach 2:
The patent extends the detection capability from a single-point sensor to a multi-point distributed sensor array. By positioning sensors at multiple focusing points with specific angular relationships (30-60 degrees from the central axis), the system creates a three-dimensional detection network that covers a wider spatial volume, thereby improving both sensing range and sensitivity without excessive complexity.
2Area of stationary object
If multiple pyroelectric infrared sensors are used to increase sensing range, then the sensing range and sensitivity improve, but the product cost increases
Solution Approach 1:
The focusing component serves multiple functions simultaneously: it focuses infrared rays onto multiple sensors, creates overlapping detection regions for enhanced sensitivity, and positions sensors at optimal angles (30-60 degrees from central axis) to maximize coverage. This multi-functionality allows the system to achieve extended sensing range with a moderate number of sensors, controlling cost while improving performance.
Solution Approach 2:
The patent optimizes the angular parameter of sensor positioning (30-60 degrees from the central axis) to achieve the best balance between sensing range and cost. By carefully selecting this angular range, the system maximizes the overlapping detection regions and sensing sensitivity while minimizing the number of sensors required, thereby controlling product cost.
3Measurement precision
If pyroelectric infrared sensors are positioned at focusing points with specific angles, then sensing sensitivity improves through overlapping detection regions, but the device complexity increases
Solution Approach 1:
The patent employs asymmetric positioning of sensors relative to the central axis, placing them at specific angles (30-60 degrees) rather than symmetrically around the axis. This asymmetric arrangement creates optimized overlapping detection regions that enhance sensing sensitivity while maintaining a relatively simple device structure, as it requires positioning sensors at specific angles rather than complex multi-dimensional arrangements.
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 improves sensing sensitivity and range while reducing costs by densely distributing detection points within overlapping regions, effectively controlling lighting fixtures based on infrared signal changes.
Implementation Method 1
pyroelectric infrared sensor (PIR) and a Fresnel lens are usually combined to sense human motion
Implementation Method 2
The focusing component is configured to focus external infrared signals onto respective pyroelectric infrared sensors
Implementation Method 3
The Fresnel lens has a special optical principle, which can generate alternating visible regions and blind regions in front of the pyroelectric infrared sensor
Data Source
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AI summary
The present disclosure provides a pyroelectric infrared sensor based lighting control device and a pyroelectric infrared sensor based lighting control system. The device includes a focusing component and at least two pyroelectric infrared sensors. The focusing component includes at least two curved surface structural portions sequentially connected adjacent to each other. Each of the curved surface structural portions corresponds to one focusing point, the at least two pyroelectric infrared sensors are respectively disposed at respective focusing points, and the focusing component is configured to focus external infrared signals onto the respective pyroelectric infrared sensors. The at least two pyroelectric infrared sensors are configured to convert changed infrared signals into voltage signals when any one of the pyroelectric infrared sensors receives the changed infrared signals, and then to control a switch status of a lighting fixture by using the voltage signals.