Object Detection System With Frequency-Dependent Acoustic Wave Pressure Control
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Solution Overview
Problem
Existing object detection systems using ultrasound waves face accuracy issues due to distortion of received-wave signals caused by the frequency characteristics of the wave receiver, such as microphones.
Innovation Solution
An object detection system that includes an acoustic wave generator producing heat-energized acoustic waves and a processing circuit performing object detection processing. The system generates a series of acoustic waves with time-varying frequencies and target sound pressures, and determines the presence of an object based on received-wave signals, with the target sound pressures set to align with the maximum sensitivity of the wave receiver within a predetermined frequency range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional ultrasound sensors are used for object detection, then the system can detect objects using reflected waves, but the detection accuracy deteriorates due to signal distortion caused by wave receiver frequency characteristics
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the sound pressure level of transmitted acoustic waves according to their frequency. The control circuit sets the sound pressure to target values that compensate for the frequency characteristics of the wave receiver, ensuring optimal sensitivity across different frequencies and eliminating signal distortion.
Solution Approach 2:
The system implements feedback by using the control circuit to monitor and adjust the sound pressure levels based on the frequency characteristics of the wave receiver. This closed-loop control ensures that the transmitted waves are always optimized for the receiver's frequency response, maintaining high detection accuracy.
2Area of stationary object
If the sound pressure of acoustic waves is increased to improve detection range, then the detection range expands, but the wave receiver sensitivity becomes suboptimal due to frequency characteristics
Solution Approach 1:
The patent dynamically changes the sound pressure parameter based on the frequency of each acoustic wave. By setting target sound pressures that correspond to the frequency characteristics of the wave receiver, the system achieves both extended detection range and optimal receiver sensitivity simultaneously.
Solution Approach 2:
The system makes the sound pressure level dynamic rather than static. The control circuit adjusts the sound pressure in real-time according to the frequency content of the transmitted waves, allowing the system to adapt to different detection scenarios and maintain optimal performance.
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 system improves object detection accuracy by reducing the influence of wave receiver frequency characteristics and preventing signal distortion, thereby enhancing the reliability of object detection and distance measurement.
Implementation Method 1
an acoustic wave generator (10) to generate an acoustic wave by generating heat upon energization
Implementation Method 2
the acoustic wave generator (10) is controlled to generate a series of acoustic waves P1 of a time-varying frequency
Implementation Method 3
detect an object that is present around a mobile unit based on reflected waves (echoes) received by the ultrasound sensors
Implementation Method 4
a wave receiver (20) to receive an acoustic wave from the target space
Data Source
AI summary
An object detection system includes a processing circuit to perform wave transmission processing and determination processing. In the wave transmission processing, an acoustic wave generator is controlled to generate a series of acoustic waves of a time-varying frequency at target sound pressures associated with a frequency and correspond to the respective acoustic waves. In the determination processing, a received-wave signal representing an acoustic wave from a target space received by a wave receiver is acquired and it is determined whether an object is present in the target space based on the received-wave signal. Each of the target sound pressures is set based on the frequency characteristics of sensitivity of the wave receiver to an acoustic wave of a predetermined sound pressure, such that the sensitivity of the wave receiver to an acoustic wave of the target sound pressure is in a predetermined range including a predetermined value.