Ultrasonic Object Detection Device Mitigating DC Component Interference
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Solution Overview
Problem
Existing ultrasonic distance measurement methods face challenges in accurately detecting small displacements due to the influence of Doppler effects and DC components in the transmit and receive signals, which impede precise complex analysis and accurate detection of object distances.
Innovation Solution
The implementation of an object detection device that includes a wave transmitter, a wave receiver, and a controller programmed to perform complex analysis on correlation signals, with a signal corrector to mitigate DC components, allowing for accurate detection of object displacements by generating and processing chirp waves using a thermophone as a sound source.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If complex analysis is performed on the correlation signal to detect small displacements, then measurement precision is improved, but DC components in the signal cause detection errors
Solution Approach 1:
The patent extracts and removes the DC component from the correlation signal through signal processing operations. The controller performs complex analysis on the correlation signal and specifically eliminates the DC component that would otherwise cause detection errors in small displacement measurements, thereby isolating the harmful element and removing it to improve measurement accuracy.
Solution Approach 2:
The patent changes the parameter state of the correlation signal by performing complex analysis and transforming the signal representation. By converting the signal to complex form and analyzing its components, the system identifies and removes the DC component (zero-frequency component), effectively changing the signal parameters to eliminate interference while preserving the useful displacement information.
2Reliability
If Doppler effect is considered in the measurement, then reliability is improved, but signal complexity increases
Solution Approach 1:
The patent introduces complex analysis as an intermediary processing step between signal reception and displacement detection. By using complex mathematical operations on the correlation signal, the system accounts for Doppler effects and other signal variations without requiring direct modification of the physical measurement system, thereby maintaining reliability while managing complexity through mathematical transformation.
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 enables highly accurate detection of small displacements and object distances by effectively removing DC components from the correlation signals, improving the precision of complex analysis and reducing detection errors caused by noise and signal attenuation.
Implementation Method 1
generating and processing chirp waves using a thermophone as a sound source
Implementation Method 2
a wave receiver to receive a sound wave and generate a receive signal that represents a reception result
Implementation Method 3
generate detection information about the object by complex analysis to perform complexification on a correlation signal that represents a correlation between the transmit signal and the receive signal
Implementation Method 4
a signal corrector configured to correct any of the correlation signal, the receive signal, and the transmit signal to mitigate a direct-current component in the correlation signal
Data Source
AI summary
An object detection device includes a wave transmitter to transmit a sound wave to an object, a wave receiver to receive the sound wave and generate a signal representing a reception result, and a controller to control transmission of the sound wave by the wave transmitter and obtain the receive signal from the wave receiver. The controller is configured or programmed to output a transmit signal to cause the wave transmitter to transmit the sound wave and obtain a corresponding receive signal. The controller is configured or programmed to generate detection information about the object by performing complexification on a correlation signal representing a correlation between the transmit signal and the receive signal. A signal corrector is configured or programmed to correct any of the correlation signal, the receive signal, and the transmit signal to mitigate a direct-current component in the correlation signal targeted for the complex analysis.