Ultrasonic Sensor Burst Signal Frequency Adaptation
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Solution Overview
Problem
Ultrasonic sensors face a drop in transmission/reception sensitivity due to environmental changes such as mud, rain, snow, and temperature variations, which affect the proper vibration frequency of the piezoelectric element, leading to reduced detection accuracy.
Innovation Solution
An ultrasonic sensor system that adjusts the burst wave frequency to match the reverberation frequency by integrating and processing the reverberation signal, using a signal processing circuit to count pulse signals and adjust the frequency to maximize signal strength, thereby maintaining sensitivity despite environmental changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the sending frequency is set to the proper vibration frequency of the piezoelectric element, then transmission/reception sensitivity is enhanced, but the sensitivity drops when environmental changes cause the proper vibration frequency to shift
Solution Approach 1:
The patent implements feedback by detecting the reverberation frequency of the piezoelectric element and using this information to automatically adjust the sending frequency. The signal processing circuit measures the reverberation frequency and feeds this back to the burst signal generating circuit, which then adjusts the sending frequency to match the current proper vibration frequency of the piezoelectric element, ensuring optimal sensitivity despite environmental changes
Solution Approach 2:
The patent changes the parameter of sending frequency dynamically based on environmental conditions. By detecting shifts in the piezoelectric element's proper vibration frequency caused by environmental factors (temperature, moisture, etc.) and adjusting the sending frequency accordingly, the system maintains optimal transmission/reception sensitivity across varying operating conditions
2Measurement precision
If multiple frequency detection and adjustment mechanisms are implemented, then frequency accuracy is improved, but device complexity increases
Solution Approach 1:
The signal processing circuit performs multiple functions using a unified approach: it detects the reverberation signal, measures the reverberation frequency, and provides this information for sending frequency adjustment. This multi-functional design achieves accurate frequency measurement without requiring separate dedicated circuits for each function, thereby limiting the increase in device complexity
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 automatically corrects the burst wave frequency to maintain transmission/reception sensitivity, enhancing detection accuracy and extending the sensor's operational range.
Implementation Method 1
the proper vibration frequency of an piezoelectric element with a view to amplifying the sent ultrasonic vibration
Implementation Method 2
an ultrasonic sensor that transmits and receives ultrasonic waves
Implementation Method 3
the time that elapses after ultrasonic waves are sent until waves reflected from an object are received is used to determine the presence/absence of an obstacle
Implementation Method 4
waves are sent at a frequency equal to the proper vibration frequency of an piezoelectric element with a view to amplifying the sent ultrasonic vibration
Data Source
Figure 1
Figure 2
Figure 3A~3C
AI summary
An ultrasonic sensor 1000 has a transmission/reception processing circuit 100, and the transmission/reception processing circuit 100 has a burst signal transmission circuit 1 that generates and transmits burst signals S0, and a signal processing circuit 7 that processes reception signals received by a piezoelectric element 4. The signal processing circuit 7 verifies the reverberation frequency of the reverberation signals of ultrasonic signals (reception signals) reflected to the piezoelectric element 4 from a subject, and on the basis of the verified reverberation frequency and reverberation time of the reception signals, adjusts the frequency of the burst signals S0 to be substantially equal to the reverberation frequency, said burst signals being to be generated by the burst signal transmission circuit 1.