Ultrasonic Motion Detection Using Echo Amplitude Analysis
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Solution Overview
Problem
Automated industrial systems face challenges in reliably detecting the range and bearing of moving objects while ignoring stationary objects, due to limitations in existing motion-detection technologies such as wide detection angles, interference issues, high costs, and susceptibility to damage.
Innovation Solution
The use of multiple ultrasound transducer elements with a 360-degree field of view, capable of detecting moving objects by emitting and receiving ultrasound waves, determining object locations based on reflection times and amplitude differences, and ignoring stationary objects as a static background.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If ultrasonic rangefinders are used for motion detection, then cost and ease of deployment are improved, but the ability to distinguish moving objects from stationary objects deteriorates
Solution Approach 1:
The system uses ultrasonic vibration waves to detect motion. By analyzing changes in the reflected ultrasonic signals caused by moving objects, the system can distinguish between stationary and moving objects while maintaining the cost and ease of deployment advantages of ultrasonic rangefinders
Solution Approach 2:
The system continuously monitors reflected ultrasonic signals and compares them against baseline characteristics to detect motion. This feedback mechanism enables the system to distinguish moving objects from stationary ones by detecting changes in the ultrasonic echo patterns over time
2Measurement precision
If scanned laser rangefinders are used for motion detection, then range and bearing data accuracy are improved, but cost and vision hazard increase
Solution Approach 1:
The system replaces optical laser-based measurement with acoustic ultrasonic measurement. This substitution eliminates the vision hazard and cost issues associated with laser systems while maintaining the capability to measure range and bearing through careful analysis of ultrasonic echo characteristics
3Area of stationary object
If Doppler microwave sensors are used for motion detection, then wide field of view is improved, but range and bearing information capability deteriorates
Solution Approach 1:
The system divides the detection field into multiple spatial zones using an array of ultrasonic transducers. Each transducer element or element group can independently analyze echoes from specific directions, enabling the system to determine both the presence of objects across a wide field of view and their specific range and bearing information through spatial correlation of the signals
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
Enables real-time detection of moving objects with different velocities and ranges, robustness, low cost, and ease of deployment, effectively enhancing safety by distinguishing between moving and stationary objects in industrial environments.
Implementation Method 1
emitting ultrasound waves into a space and detecting reflections of the ultrasound waves from objects in the space
Implementation Method 2
detecting reflections of the ultrasound waves from objects in the space
Implementation Method 3
determining real-time movements of the objects based on amplitude differences between amplitudes of echoes in a current wave cycle and an average amplitude over multiple wave cycles
Data Source
AI summary
Movements of objects within a space are adaptively detected by emitting ultrasound waves into the space and detecting reflections of the ultrasound waves, determining locations of objects within the space based on the ultrasound reflections, and determining real-time movements of the objects based on, in certain embodiments, (i) amplitude differences between amplitudes of echoes in a current wave cycle and an average amplitude over a plurality of wave cycles and (ii) elapsed times of the ultrasound reflections associated with the amplitude differences.