Ultrasonic Motion Detection Using Dual Threshold Signal Analysis
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Solution Overview
Problem
Ultrasonic sensors face challenges in accurately detecting object movement due to small longitudinal components, circular motion, irregular shapes, and non-perpendicular surfaces, leading to high false-rejection and false-detection rates with single-threshold approaches.
Innovation Solution
A method and device that utilize a processor to analyze fluctuations in ultrasonic sensor output values, determining motion by comparing distance changes within predetermined threshold ranges, thereby increasing sensitivity and reducing false-detection rates, and differentiating objects moving in circular paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single-threshold approach is used to detect object movement, then the detection process is simple, but the false-rejection and false-detection rates are high
Solution Approach 1:
The single threshold is segmented into two thresholds (minimum threshold and maximum threshold) to create a more nuanced detection system. This segmentation allows the system to distinguish between different types of signal variations, reducing false detections while maintaining operational simplicity through programmable logic.
Solution Approach 2:
The detection system changes from using a single threshold parameter to using two threshold parameters (minimum and maximum). This parameter change enables the system to better characterize object movement by evaluating whether signal variations fall within an acceptable range, thereby improving detection reliability.
2Adaptability or versatility
If ultrasonic sensor is used to detect objects with irregular shapes or non-perpendicular surfaces, then the sensor can detect a wider variety of objects, but the detection accuracy decreases due to small longitudinal components and circular motion
Solution Approach 1:
The system dynamically evaluates signal variations by comparing them against both minimum and maximum thresholds. This dynamic approach allows the system to adapt to different object types and motion patterns, distinguishing between genuine movement and signal variations caused by irregular shapes or circular motion.
Solution Approach 2:
The system uses feedback from the dual-threshold comparison to improve detection accuracy. By continuously evaluating whether signal variations fall within the threshold range and adjusting motion detection decisions accordingly, the system can accurately detect movement even for objects with irregular characteristics.
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 approach effectively detects object movement with increased accuracy and reduced false-detection rates, even for objects with irregular shapes or surfaces, by tracking distance changes over time and using dual thresholds to filter noise.
Implementation Method 1
Ultrasonic sensors may detect objects and object movement by emitting ultrasonic sound waves from an ultrasonic wave source and detecting echoes of the ultrasonic waves that are reflected by surrounding objects
Implementation Method 2
detecting echoes of the ultrasonic waves that are reflected by surrounding objects
Data Source
AI summary
Methods and devices for detecting movement of an object includes: receiving a plurality of output signal values from a sound wave receiver, each of the plurality of output signal values being representative of a distance between the object and the sound wave receiver; determining, based on the received plurality of output signal values, a difference value representative of a difference between a first output signal value and a second output signal value among the plurality of output signal values; determining whether the difference value is representative of motion of the object based on whether the difference value has a magnitude between a predetermined minimum threshold and a predetermined maximum threshold; and outputting a motion detection signal if the difference value is determined to have a magnitude between the predetermined minimum threshold and the predetermined maximum threshold.