Ultrasonic Sensor Tubular Waveguide Noise Suppression
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Solution Overview
Problem
Current ultrasonic sensors face challenges in achieving high resolution due to noise and crosstalk issues when inspecting objects like banknotes, particularly when dealing with high-speed paper sheets, which affect the accuracy of detecting foreign matter and thickness distribution.
Innovation Solution
The design incorporates a tubular member between the object and the ultrasonic wave transmitter or receiver to suppress noise and crosstalk, featuring a thin end portion and varying diameters to enhance directivity and reduce reflections, allowing for efficient sound wave guidance and improved resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional ultrasonic sensor is used without additional noise suppression structures, then the device complexity is low, but noise and crosstalk affect measurement precision
Solution Approach 1:
A tubular member is introduced as an intermediary component between the ultrasonic wave transmitter/receiver and the inspection object. This tube suppresses noise and crosstalk by guiding the ultrasonic waves and preventing unwanted reflections, thereby improving measurement precision without significantly complicating the overall device structure.
Solution Approach 2:
The tubular member features a thin end portion specifically at the inspection object-facing end, while the other portions have varying diameters. This local variation in thickness and diameter optimizes the suppression of noise and crosstalk at critical locations while maintaining structural integrity and minimizing overall device complexity.
2Reliability
If the tubular member has uniform thickness throughout, then the manufacturing is simple, but noise suppression and directivity are insufficient
Solution Approach 1:
The tubular member is designed with a thin end portion at the inspection object-facing end and varying diameters along its length, while other portions maintain sufficient thickness for structural support. This local differentiation optimizes noise suppression and directivity where needed while keeping manufacturing feasible through standardized processes for the uniform sections.
3Measurement precision
If the ultrasonic wave transmitter is positioned close to the inspection object for high resolution, then measurement precision improves, but noise and crosstalk increase
Solution Approach 1:
The tubular member serves as a mediator that allows the ultrasonic wave transmitter to be positioned close to the inspection object for high resolution while simultaneously suppressing crosstalk and noise. The tube guides the ultrasonic waves directly to the target area and prevents unwanted reflections from reaching the receiver.
Solution Approach 2:
The tubular member's varying diameter and thin end portion create specific acoustic impedance changes that optimize ultrasonic wave transmission to the inspection object while suppressing unwanted reflections and crosstalk, enabling high-resolution inspection without the negative effects of close positioning.
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 high-resolution detection of foreign matter and thickness distribution on high-speed paper sheets, reducing noise and crosstalk, thereby enhancing the inspection accuracy and resolution of ultrasonic sensors.
Implementation Method 1
a tubular member between the object and the ultrasonic wave transmitter or receiver to suppress noise and crosstalk, featuring a thin end portion and varying diameters to enhance directivity and reduce reflections, allowing for efficient sound wave guidance
Implementation Method 2
featuring a thin end portion and varying diameters to enhance directivity and reduce reflections
Data Source
AI summary
A sensor includes a first element part having a first member and a first element. The first member is a acoustic tubular waveguide and extends along a first direction. The acoustic tubular waveguide includes a first opening and a second opening. A direction from the second opening toward the first opening is along the first direction. The first element includes a vibratile first membrane, and a first supporter supporting the first membrane. The second opening is between the first opening and the first membrane in the first direction. The sensor may be a Piezoelectric Micro electro mechanical systems Ultrasonic Transducer and may be used for inspecting paper and/or resin including detecting thickness of a fed through banknote and/or the presence of foreign matter thereon such as tape. An optical element may alternatively measure the vibration of a membrane from acoustic through transmission instead of an acoustic receiver.