Selectable Motion Sensor with Adjustable Detection Field
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Solution Overview
Problem
Current motion detector systems are ineffective at monitoring motion near walls or in large areas, require strategic positioning, and can interfere with hearing aids due to high-frequency ultrasound usage, necessitating multiple transducers for effective detection.
Innovation Solution
A motion sensor with a modulator using selectable lenses that can configure the detection field by aligning different lenses with a sensor, allowing for adjustable detection areas and reduced sensor count, and utilizing frequencies that minimize interference with hearing aids.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If high-frequency ultrasound (40 KHz) is used for motion detection, then interference with hearing aids is minimized, but energy attenuation by air increases requiring multiple transducers
Solution Approach 1:
The patent introduces reflective surfaces (walls, objects in the detection area) as intermediaries to carry the ultrasound signal from the transducer to the sensor. Instead of requiring direct line-of-sight paths through air, the system uses reflections off intermediate surfaces to extend detection range and reduce the number of transducers needed, while maintaining high frequency operation to avoid hearing aid interference.
2Area of stationary object
If motion detectors are strategically positioned in corners or narrow corridors, then detection coverage in specific areas is improved, but the devices become protrusive and unattractive
Solution Approach 1:
The patent employs adjustable and reconfigurable detection fields that can be dynamically oriented and shaped. The system includes adjustable transducers and reflective surfaces that can be positioned to direct detection beams in various directions, allowing the detector to be mounted in aesthetically pleasing locations rather than requiring corner placement, while maintaining effective detection coverage through dynamic beam steering and reflection angle adjustment.
3Adaptability or versatility
If a single detection field configuration is used, then the device structure is simple, but the system lacks flexibility to be mounted in various places and provide better coverage
Solution Approach 1:
The patent divides the detection system into modular components: multiple independent transducers, separate reflective surfaces, and individual sensors that can be independently positioned and adjusted. This segmentation allows each component to be optimized for its specific function while providing overall system flexibility, enabling the detector to be configured for different mounting locations and detection scenarios without requiring complete system redesign.
Solution Approach 2:
The patent creates a universal detection system where the same basic components (transducers, reflective surfaces, sensors) can be configured for multiple detection scenarios and mounting locations. The system can adapt to different room geometries, detection areas, and installation constraints by repositioning and reconfiguring the modular components, providing multi-functional capability without requiring multiple specialized devices.
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 provides flexible and effective motion detection across various areas with fewer sensors, improved coverage, and reduced interference with hearing aids by using adjustable lenses and appropriate frequency selection.
Implementation Method 1
The modulator can be a shaped lens including a Fresnel lens. The modulator can selectively pass electromagnetic radiation through the modulator to the sensor.
Implementation Method 2
The modulator can be a shaped lens including a Fresnel lens.
Implementation Method 3
The use of a modulator that polarizes the electromagnetic radiation is also contemplated by this invention.
Implementation Method 4
The transmitted radiation reflects off an object in the detection field and is received by the sensor.
Implementation Method 5
The motion sensor includes a sensor receiving the modulator output.
Data Source
AI summary
A detection field selectable motion sensor that includes a modulator having a output with a shaped response to received radiation emissions forming a detection field and a sensor configured to detect the output from the modulator. The motion sensor can be configured with a set of lenses that can be aligned with the sensor. Further, the motion sensor can be an active sensor that transmits electromagnetic radiation which is detected after reflection from a detection field. Infrared radiation is the preferred source of received and transmitted radiation but microwave or visible light can be used. For an active motion detection either coherent or incoherent radiation can be used. The motion sensor includes a means for mounting and a hinge or swivel for orientating the sensor.