Ultrasonic Sensor Object Detection Using Multi-Frequency Waves
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Solution Overview
Problem
Conventional ultrasonic sensors face challenges in accurately distinguishing between reverberation waves and reflected waves from objects at short distances, leading to difficulties in detecting objects both near and far, especially in multifunction peripherals where a fixed configuration limits detection range.
Innovation Solution
The ultrasonic sensor apparatus employs a transmission unit that sends both a first and a second wave with shorter wavelengths, allowing the reception unit to differentiate between reflected waves based on these, thereby improving detection accuracy across various distances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the ultrasonic receiver receives a direct wave from the ultrasonic oscillator, then the detection sensitivity is high, but the ability to distinguish between direct waves and reflected waves from objects at short distances deteriorates
Solution Approach 1:
The patent applies periodic action by transmitting ultrasonic waves at multiple different frequencies (first frequency and second frequency) in sequence. The receiver captures reflected waves at both frequencies, and the determination unit analyzes the frequency characteristics to distinguish between direct waves and reflected waves. This periodic transmission of different frequency waves enables the system to maintain high detection sensitivity while resolving the ambiguity between direct and reflected waves.
Solution Approach 2:
The patent changes the frequency parameter of the transmitted ultrasonic waves to solve the distinction problem. By transmitting waves at different frequencies (first frequency and second frequency) and analyzing the reflected waves at these different frequencies, the system can identify whether the received wave is a direct wave or a reflected wave from an object. This parameter change enables differentiation based on frequency characteristics.
2Duration of action of moving object
If the ultrasonic oscillator outputs reverberation waves for a short period, then the oscillation operation can be stopped, but the ability to detect objects at long distances deteriorates due to interference with reflected waves
Solution Approach 1:
The patent uses periodic action by transmitting ultrasonic waves at multiple frequencies in sequence and analyzing the reflected waves at different time points. The determination unit processes the reflected waves captured at both the first frequency and second frequency, allowing the system to maintain detection capability for long distances even after the oscillation operation stops, by utilizing the frequency differentiation to eliminate reverberation interference.
Solution Approach 2:
The patent changes the frequency parameter to distinguish between reverberation waves and reflected waves from distant objects. By transmitting at different frequencies and analyzing the frequency characteristics of the reflected waves, the system can identify true reflected waves from distant objects even when reverberation is present, thereby maintaining detection accuracy at long distances.
3Measurement precision
If the sensor uses a fixed configuration for short distance detection, then the detection accuracy at short distances is improved, but the detection range for objects at long distances is limited
Solution Approach 1:
The patent applies universality by designing a multi-functional detection system that can detect objects at both short and long distances using the same sensor apparatus. The determination unit processes reflected waves at multiple frequencies to distinguish between direct waves and reflected waves, enabling the sensor to adapt to different detection scenarios (short distance and long distance) without requiring separate fixed configurations, thus achieving both high accuracy at short distances and extended detection range.
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 approach enhances the accuracy of object detection by enabling the sensor to distinguish between direct and reflected waves, effectively covering both short and long distances without compromising detection precision.
Implementation Method 1
a transmission unit for transmitting a wave and a reception unit for receiving a wave from outside
Implementation Method 2
an ultrasonic receiver for detecting a reflected wave from an object
Implementation Method 3
a reception unit for receiving a wave from outside... a first reflected wave received by the reception unit for the first wave and a second reflected wave received by the reception unit for the second wave
Data Source
AI summary
A transmission unit is caused to transmit a first wave from a transmission unit that transmits waves, and a second wave. Based on a first reflected wave of the first wave and a second reflected wave of the second wave, it is determined whether there is an object outside of the apparatus.