Ultrasonic Flow Meter Housing with Acoustically Matched Base
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Solution Overview
Problem
Clamp-on ultrasonic flow meters face challenges in harsh environments due to signal noise ratio issues and the need for effective mounting solutions that protect sensors from extreme conditions such as underwater or combustible environments.
Innovation Solution
A device with a pressure vessel enclosure and hardware for mounting ultrasonic sensors on the pipe wall, where the enclosure's base and pipe wall have matching resonant frequencies and acoustic impedance, enhancing signal transmission and noise reduction through optimized acoustic matching and a couplant layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If clamp-on ultrasonic flow meters are used in harsh environments, then the ability to measure fluid flow in extreme conditions is improved, but the signal to noise ratio deteriorates making it difficult to accurately distinguish fluid flow signals from noise
Solution Approach 1:
An acoustically matched base material is introduced as an intermediary between the ultrasonic sensor and the pipe wall. This base material serves as a mediator that transmits ultrasonic signals more effectively than air or harsh environment media, improving the signal-to-noise ratio while enabling measurement in extreme conditions such as underwater or combustible environments.
Solution Approach 2:
The acoustic impedance and resonant frequency parameters of the base material are specifically selected to match those of the pipe wall. By changing the physical parameters of the interface material to match the pipe wall parameters, signal transmission is optimized and signal-to-noise ratio is improved in harsh environments.
2Measurement precision
If the enclosure base and pipe wall have matching resonant frequencies and acoustic impedance, then signal transmission is improved and distortion is minimized, but the device complexity increases due to the need for acoustically matched materials and precise frequency matching
Solution Approach 1:
The base material is designed with specific acoustic parameters (acoustic impedance and resonant frequency) that match the pipe wall. By carefully selecting and controlling these physical parameters of the base material, high-quality signal transmission is achieved while the complexity is managed through parameter specification rather than complex structural design.
Solution Approach 2:
The base material is designed to resonate at frequencies that match the pipe wall's resonant frequencies. By utilizing mechanical vibration and resonance principles, the base material naturally couples with the pipe wall to transmit ultrasonic signals efficiently, improving measurement precision without requiring overly complex coupling mechanisms.
3Reliability
If ultrasonic sensors are protected from harsh environments, then the reliability and durability of the sensors is improved, but the mounting complexity increases due to the need for pressure vessel enclosures and specialized mounting hardware
Solution Approach 1:
The pressure vessel enclosure acts as an intermediary protective barrier between the ultrasonic sensors and the harsh environment. This mediator allows the sensors to operate in protected conditions while still enabling ultrasonic signal transmission through the acoustically matched base material to the pipe wall, thus protecting sensors without overly complicating the mounting.
Solution Approach 2:
The acoustically matched base serves multiple functions: it provides acoustic coupling for signal transmission, structural support for mounting the pressure vessel enclosure, and a mounting surface for attaching the enclosure to the pipe wall. By combining multiple functions into a single component, the overall mounting complexity is reduced despite the need for sensor protection.
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
Improves signal-to-noise ratio and allows for accurate fluid flow measurement in harsh environments by minimizing signal distortion and attenuation, ensuring reliable operation under extreme conditions.
Implementation Method 1
The enclosure base and the pipe wall have substantially similar resonant frequencies and acoustic impedance
Implementation Method 2
The enclosure base and the pipe wall have substantially similar resonant frequencies and acoustic impedance
Implementation Method 3
Each sensor has a transmitter and a receiver. The transmitters are adapted to transmit signals at one or more frequencies
Implementation Method 4
ultrasonic signals emitted from the transmitters travel through the immediate pipe wall, the fluid flow disposed within the pipe, and through the opposite pipe wall where they are sensed by the receiver portion
Data Source
Figure 1~3
AI summary
A device for sensing fluid flow within a pipe, which pipe has a pipe wall, is provided. The device includes a sensor housing and a fluid flow meter. The sensor housing includes at least one pressure vessel enclosure and hardware for mounting the enclosure on an exterior surface of the pipe wall. The enclosure includes a base, side walls, and a cap. The enclosure base has a pipe-side surface that mates with the exterior surface of the pipe wall. The enclosure base and the pipe wall have substantially similar resonant frequencies and acoustic impedance. The sensor housing is adapted to be attached to the pipe wall such that the pipe-side surface of the base is mated with the exterior surface of the pipe wall. The fluid flow meter includes a plurality of ultrasonic sensors disposed within the at least one pressure vessel enclosure. Each sensor has a transmitter and a receiver. The transmitters are adapted to transmit signals at one or more frequencies, including frequencies that are substantially equal to the resonant frequencies of the base and pipe wall.