Multi-Sensor Lighting System with Adjustable PIR Fields
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Solution Overview
Problem
Existing security lighting systems often require multiple sensors to detect motion in multiple areas, which can be impractical due to limited viewing fields of single wide-angle detectors and inability to adjust sensor orientation, leading to ineffective coverage and unnecessary light activation in daylight.
Innovation Solution
A multi-sensor illumination system incorporating passive infrared sensors and logic circuits that allow for simultaneous detection of motion in multiple fields of view, including 'look-out' and 'look-down' sensors, integrated with photocell sensors to conditionally activate lamps based on ambient light levels and timer settings, enabling flexible and efficient lighting control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single wide-angle motion sensor is used to detect motion in multiple areas, then the device complexity is reduced, but the measurement precision and reliability of motion detection in different zones deteriorates
Solution Approach 1:
The patent divides the motion detection system into multiple separate sensors, each dedicated to detecting motion in a specific zone or area. This segmentation allows each sensor to be optimized for its specific detection area, improving overall reliability while maintaining manageable system complexity through modular design.
Solution Approach 2:
The patent introduces multiple sensors with different viewing angles and orientations (e.g., upward, downward, lateral views) to detect motion in three-dimensional space. This dimensional approach allows comprehensive coverage of multiple areas without requiring a single complex wide-angle sensor.
2Measurement precision
If motion sensors are aimed at specific locations to detect motion in distinct areas, then the measurement precision is improved, but the ease of operation and installation deteriorates
Solution Approach 1:
The patent employs sensors with adjustable viewing angles and orientations that can be dynamically configured during installation to target specific zones. This dynamic adjustability allows installers to optimize sensor placement for precise motion detection in different areas while maintaining ease of installation through simple angular adjustments.
Solution Approach 2:
The patent utilizes sensors with variable detection parameters such as viewing angle, detection distance, and orientation that can be changed during installation to match specific application requirements. This parameter flexibility enables precise motion detection in different zones without complicating the installation process.
3Reliability
If security lights are activated in all areas when motion is detected anywhere, then the security coverage is improved, but the loss of energy increases due to unnecessary activation during daylight
Solution Approach 1:
The patent incorporates ambient light sensors that provide feedback about daylight conditions to the control system. This feedback mechanism allows the system to distinguish between motion events occurring during daylight versus nighttime, activating security lights only when necessary and thereby reducing energy consumption while maintaining comprehensive security coverage.
Solution Approach 2:
The patent uses ambient light level as a controlling parameter to modulate the activation of security lights. The system changes its operational state based on ambient light conditions, suppressing light activation during daylight hours while maintaining full security coverage during nighttime, thus optimizing energy consumption.
4Measurement precision
If multiple sensors are deployed to detect motion in different zones, then the measurement precision is improved, but the device complexity increases
Solution Approach 1:
The patent combines multiple motion sensors and their control circuits into an integrated system with a centralized control unit that manages all sensors uniformly. This merging approach maintains the measurement precision of multiple sensors while reducing overall system complexity through standardized interfaces and unified control architecture.
Solution Approach 2:
The patent designs the sensor system with universal control circuits and standardized communication protocols that can manage multiple sensors of different types and orientations through a single control unit. This multi-functionality reduces device complexity by eliminating the need for separate control systems for each sensor while preserving the precision benefits of multiple sensors.
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 system effectively activates lights in distinct areas based on motion detection and ambient light conditions, providing enhanced security lighting coverage without unnecessary activation during daylight, improving the efficiency and adaptability of lighting systems.
Implementation Method 1
a plurality of passive infrared sensors (PIR) and associated signal conditioning circuitry to provide at least one output signal representative of a motion event
Implementation Method 2
a photocell sensor and circuit that provides an output to the control circuit representative of a low ambient light level on a photocell
Data Source
AI summary
A circuit for operating a plurality of electrical devices such as lamps for outdoor illumination includes a plurality of motion sensor circuits for detecting motion relative thereto and a plurality of outputs conditioned upon motion detection. Additionally, a photocell sensor circuit for detecting a low ambient illumination level has an output command conditioned upon the detection of a predetermined illumination level that is electrically coupled to the control circuit for illumination of lamps at low ambient lighting levels. The present invention enables the activation of lamps by a plurality of motion sensors having differing fields of view.