Microwave Sensor 360-Degree Detection for Lighting
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Solution Overview
Problem
Current PIR motion sensors have limited detection angles, are sensitive to environmental temperatures, and cannot penetrate certain materials, leading to false triggers and increased costs when trying to expand detection ranges, making them unreliable in various environments.
Innovation Solution
The use of a microwave sensor based on Doppler radar theory, which provides a 360-degree detection angle, is not affected by temperature, humidity, light, or airflow, and can penetrate non-metallic materials, allowing for reliable detection and activation of lighting systems without the need for multiple sensor heads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If PIR sensor heads are increased from 1 to 2 or more to expand detection angle, then detection coverage is improved, but device cost and complexity dramatically increase
Solution Approach 1:
The patent combines multiple PIR sensor heads into a single integrated sensor unit with a specialized lens system. This merging approach achieves wide-angle detection coverage without the need for multiple separate sensor heads, thereby reducing device complexity and cost while maintaining improved detection coverage.
Solution Approach 2:
The single PIR sensor head is equipped with a multi-functional lens system that enables it to perform the detection function across a wide angle range, replacing what would traditionally require multiple specialized sensor heads. This makes the single sensor unit universal for wide-area detection applications.
2Device complexity
If PIR motion sensor is used in high temperature environments, then device simplicity is maintained, but reliability deteriorates due to false triggers when ambient temperature exceeds human body temperature
Solution Approach 1:
The patent changes the detection parameter from temperature-based detection (PIR) to microwave-based detection. This parameter change allows the system to operate reliably in high temperature environments where PIR sensors would fail, as microwave detection is not affected by ambient temperature conditions and can distinguish between temperature changes and actual motion.
3Ease of manufacture
If PIR sensor is used for detection, then initial cost is low, but false triggers increase in varying environmental conditions such as temperature changes, humidity, light, and airflow
Solution Approach 1:
The patent replaces the thermal-based PIR detection mechanism with a microwave-based detection system. This substitution eliminates the sensitivity to environmental factors like temperature, humidity, light, and airflow that cause false triggers in PIR sensors, while maintaining cost-effectiveness through integrated design.
4Reliability
If microwave sensor is used instead of PIR sensor, then detection reliability is improved in various environments, but manufacturing cost increases
Solution Approach 1:
The patent merges the microwave sensor functionality with the lighting device into a single integrated unit. This combination allows the microwave sensor to be shared across multiple lighting devices, reducing the overall manufacturing cost while maintaining high detection reliability in various environmental conditions.
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 microwave sensor offers a reliable and cost-effective solution for wide-area detection, reducing false triggers and increasing the range of motion detection systems, enabling effective operation in diverse environmental conditions without the limitations of PIR sensors.
Implementation Method 1
The microwave-sensor (hereafter as MS) which is basing on the Doppler radar theory design sensor to detector moving objects
Implementation Method 2
it can installed inside thicker glass, plastic, wooden, or non-metal material without any interruption or affection the wireless electric signal for detection or transmission
Data Source
AI summary
A microwave-sensor application for a light or electric device has a built-in microwave-sensor which can penetrate a wall, glass, building, garage door, or cement to detect over a 360 degree angle and predetermined vertical range. The microwave sensor can be used to activate a microwave-sensor application device or light device having an LED and/or laser for illumination or to provide an anti-theft alarm or warning.