Acoustic Object Detection with Resonance-Aware Signal Tuning
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Solution Overview
Problem
The detection of objects using acoustic waves becomes difficult due to the influence of direct waves and resonance effects, particularly in close-range scenarios, which complicates the distinction between direct and reflected waves.
Innovation Solution
The object detection device employs a transmitter and receiver separated by a distance, using a thermophone for the transmitter to generate acoustic waves with controlled impulse waveforms that consider the receiver's frequency characteristics to minimize resonance and reduce ringing periods, thereby enhancing the detection of objects at close ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the transmitter and receiver are placed close together to enable close-range detection, then the detection range is improved, but the receiver resonates due to direct waves from the transmitter, causing detection difficulty
Solution Approach 1:
The patent changes the frequency parameter of the transmission signal to avoid the resonant frequency of the receiver. By setting the transmission frequency different from the receiver's resonant frequency, the direct wave-induced resonance is suppressed, allowing close-range detection without detection failure
Solution Approach 2:
The patent applies preliminary anti-action by pre-adjusting the transmission signal frequency to counteract the potential resonance effect before it occurs. The controller sets the transmission frequency in advance to be different from the receiver's resonant frequency, preventing the harmful resonance from happening during detection
2Power
If the transmission frequency is set to the resonant frequency of the ultrasonic microphone, then the transmission efficiency is improved, but the reverberation duration increases, affecting reception
Solution Approach 1:
The patent changes the frequency parameter from the resonant frequency to a non-resonant frequency. This trade-off reduces transmission efficiency slightly but dramatically shortens the reverberation duration, allowing the receiver to detect reflected waves sooner without being overwhelmed by prolonged resonance
3Reliability
If the receiver is provided separately from the transmitter, then the resonance influence on reception is reduced, but the device complexity increases
Solution Approach 1:
The patent applies segmentation by separating the transmitter and receiver into distinct components. This physical separation prevents the transmitted acoustic waves from directly resonating the receiver, improving reception accuracy by eliminating the harmful direct wave influence
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
This configuration allows for accurate object detection by reducing the influence of direct waves and resonance, enabling reliable detection of objects at shorter distances by minimizing ringing periods and improving signal differentiation.
Implementation Method 1
a transmitter to generate an acoustic wave as a signal wave based on a predetermined transmission signal and transmit the signal wave toward an object
Implementation Method 2
The receiver has frequency characteristics such that the reception signal fluctuates when the receiver resonates
Implementation Method 3
using a thermophone for the transmitter to generate acoustic waves with controlled impulse waveforms
Data Source
AI summary
An object detection device includes a transmitter to generate an acoustic wave as a signal wave based on a predetermined transmission signal and transmit the signal wave toward an object, a receiver provided separately from the transmitter and to receive the acoustic wave to generate a reception signal, and a controller to generate the transmission signal to control the signal wave from the transmitter. The receiver has frequency characteristics such that the reception signal fluctuates when the receiver resonates. The transmission signal is set according to the frequency characteristics of the receiver to reduce or prevent a resonance of the receiver at a time of reception of the signal wave from the transmitter.