Ultrasonic Sensor Array for Point Sound Source Focusing
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Solution Overview
Problem
Conventional ultrasonic sensors cannot function as point sound sources due to their inability to achieve constructive interference of ultrasonic waves, limiting their ability to focus sound intensity at specific positions.
Innovation Solution
The ultrasonic sensor design includes a plurality of patterned emitting electrodes arranged in an array, each individually coupled to a signal lead, allowing for phase-controlled focus by applying driving voltage signals with different phases to achieve constructive interference and concentrate sound intensity at a selected position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional ultrasonic sensors use a single emitting electrode structure, then the device complexity is low, but the sound intensity cannot be focused at a specific position
Solution Approach 1:
The single emitting electrode is divided into multiple emitting electrodes arranged in an array. Each emitting electrode can be independently controlled to generate ultrasonic waves with different phases, enabling constructive interference at a specific focal position. This segmentation allows precise control over the phase and amplitude of ultrasonic waves to achieve focusing.
Solution Approach 2:
Different regions of the emitting electrode array are assigned different functions through local quality variation. By controlling the phase and amplitude of each emitting electrode locally, the system creates a focused ultrasonic beam at a specific position while maintaining the overall structure of the electrode array.
2Illumination intensity
If multiple emitting electrodes are used to achieve constructive interference, then the sound intensity at the focal position is enhanced, but the device complexity increases
Solution Approach 1:
Multiple emitting electrodes are combined into a unified array structure that works together to generate constructive interference. The individual ultrasonic waves from each emitting electrode are merged through phase-controlled superposition to create a focused beam with enhanced sound intensity at the focal position.
Solution Approach 2:
The phase and amplitude parameters of the driving signals applied to each emitting electrode are carefully controlled and adjusted. By varying these parameters across different emitting electrodes, the system achieves constructive interference at the focal position, enhancing sound intensity while managing the complexity through systematic parameter control.
3Measurement precision
If each emitting electrode is individually coupled to a signal lead for phase control, then the focus precision is improved, but the manufacturing complexity increases
Solution Approach 1:
The electrode array is segmented with each emitting electrode having its own dedicated signal lead for independent phase control. This segmentation enables precise control of the phase and amplitude of ultrasonic waves from each electrode, achieving accurate focusing while providing a clear manufacturing roadmap through systematic electrode-signal lead pairing.
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 design enables the ultrasonic sensor to function as a point sound source by generating constructive interference, enhancing sound intensity at a specific position through phase-controlled focus, effectively overcoming the limitations of conventional ultrasonic sensors.
Implementation Method 1
a piezoelectric layer (23) and a plurality of signal leads (24), the plurality of emitting electrodes (21) and the opposite electrode are respectively on two sides of the piezoelectric layer (23)
Implementation Method 2
applying driving voltage signals with different phases to achieve constructive interference and concentrate sound intensity at a selected position
Data Source
AI summary
The present disclosure provides an ultrasonic sensor, a method for driving the same, and a method for manufacturing the same. The ultrasonic sensor includes a back plate, a sounding structure on the back plate and a backing layer on a side of the sounding structure distal to the back plate; the sounding structure includes a plurality of emitting electrodes, an opposite electrode, a piezoelectric layer and a plurality of signal leads, and the plurality of emitting electrodes and the opposite electrode are respectively arranged on two sides of the piezoelectric layer; and the plurality of emitting electrodes are arranged in an array, and each of the emitting electrodes is individually coupled to one of the signal leads. The ultrasonic sensor may achieve an independent control for each patterned electrode such that the ultrasonic sensor may be used as a point sound source.