Motion Sensor LED Aiming Aid for Invisible Detection Zones
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Solution Overview
Problem
Existing motion sensors, particularly PIR, ultrasonic, and microwave sensors, face challenges in proper alignment due to invisible detection zones, requiring tedious and error-prone installation processes, and lack visible feedback to indicate monitored and unmonitored areas, leading to potential false triggers from heat sources or objects.
Innovation Solution
Incorporating a super bright LED with a multi-lens system or small windows that project visible light within the detection zones, allowing users to visually confirm alignment and detect the coverage area, applicable to various motion sensing technologies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a multi-element Fresnel lens system is used to create multiple detection zones, then the detection sensitivity is improved, but the device complexity increases and the alignment becomes more difficult
Solution Approach 1:
A visible light source (LED or laser) is introduced as an intermediary to visualize the invisible infrared detection zones. The visible light follows the same optical path through the Fresnel lens system, allowing users to see where detection zones are located without changing the infrared sensing functionality. This mediator resolves the contradiction by making alignment easy while preserving detection sensitivity.
Solution Approach 2:
The patent uses visible light (which has color in the visible spectrum) to represent the invisible infrared detection zones. By converting the invisible infrared energy path into visible light patterns, users can easily identify detection zone boundaries and perform accurate alignment. This principle transforms an invisible function into a visible one without affecting the original sensing capability.
2Measurement precision
If the detection zones are made smaller to increase the number of zones, then the detection precision is improved, but the coverage area decreases and alignment becomes more tedious
Solution Approach 1:
The visible light source serves as a mediator that projects the exact pattern of multiple small detection zones, making them visible to the user. Instead of making alignment easier by reducing the number of zones, the patent makes the complex pattern of many small zones visible, allowing precise alignment of each zone while maintaining the beneficial detection precision of multiple small zones.
3Manufacturing precision
If the trial and error walk test method is used to align detection zones, then the alignment accuracy can be achieved, but the installation time increases significantly
Solution Approach 1:
The visible light source continuously projects the detection zone pattern before alignment is complete, allowing users to see the exact positions that need adjustment. This preliminary visualization eliminates the need for repeated trial-and-error testing, as users can directly observe and adjust the sensor position to match the visible pattern, achieving accurate alignment in a single attempt rather than through multiple iterations.
Solution Approach 2:
The visible light projection provides real-time feedback during the alignment process. Users can immediately see whether the detection zones are properly positioned by observing the visible light pattern, and make adjustments accordingly. This continuous visual feedback eliminates the delayed feedback inherent in the trial-and-error method, where users must wait for test results after each adjustment.
4Reliability
If the motion sensor uses invisible infrared detection, then the detection capability is improved, but the user feedback visibility deteriorates
Solution Approach 1:
A visible light source is introduced as an intermediary to represent the invisible infrared detection zones. The visible light follows the same optical path as the infrared energy, creating a visual map of the detection zones. This intermediary provides the missing visual feedback without interfering with the infrared detection capability, as the visible and infrared paths are made to coincide through proper optical design.
Solution Approach 2:
The visible light creates a visual copy or replica of the invisible infrared detection zone pattern. By copying the spatial distribution and boundaries of the infrared zones into the visible spectrum, users gain visual information about detection zone locations without altering the original infrared sensing function. This copy allows users to see and align with the detection zones that would otherwise be invisible.
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
Simplifies the installation process by providing clear visual feedback, reducing installation time and errors, and enabling quick identification of objects within detection zones to prevent false triggers.
Implementation Method 1
Incorporating a super bright LED with a multi-lens system or small windows that project visible light within the detection zones
Implementation Method 2
A multi-lens system or an arrangement of small windows in front of the LED projects light visible to an observer
Data Source
AI summary
A motion sensor incorporates an internal light source, typically a super bright LED. A multi-lens system or an arrangement of small windows in front of the LED projects a visible light pattern that mimics the detection pattern of the motion sensor to an observer standing in the detection zone and looking at the sensor.