Flow Measurement Transducer Alternating Oscillation Roles
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Solution Overview
Problem
Existing flow measurement devices, such as Coriolis measuring devices, face accuracy issues due to aging phenomena and asymmetries, leading to measurement uncertainties, which require regular testing to account for these changes.
Innovation Solution
The method involves using at least two transducer elements that alternate between exciting and receiving mechanical oscillations in the measuring tube, with distinct electronics for each task, allowing for separate test and measurement modes, and potentially using three elements for more comprehensive monitoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate oscillation exciters and oscillation receivers are used, then structural isolation between excitation and detection is achieved, but device complexity increases and more components are subject to aging
Solution Approach 1:
Each transducer element is designed to perform both oscillation excitation and oscillation detection functions. The same piezoelectric element that generates mechanical oscillations in the measuring tube also detects the resulting oscillations, eliminating the need for separate exciters and receivers. This multi-functional approach reduces the total number of components while maintaining measurement reliability.
2Device complexity
If the same transducer element is used for both excitation and detection, then device complexity is reduced, but measurement precision may be affected by operational asymmetries
Solution Approach 1:
The system alternates between different operational modes where transducer elements switch between excitation and detection roles over time. By periodically switching which element performs which function, the system can identify and compensate for asymmetries and aging effects through comparison of measurements taken under different configurations.
Solution Approach 2:
The system uses the detection function to monitor the excitation process and provides feedback for compensation. By measuring the actual oscillations generated and comparing them against expected values, the system can detect asymmetries and aging phenomena, then apply correction factors to maintain measurement precision.
3Duration of action of moving object
If transducer elements are subjected to aging processes and extraordinary parameters, then operational experience is gained, but loss of accuracy occurs requiring regular testing
Solution Approach 1:
The system performs self-diagnosis and accuracy checks during normal operation by alternating the roles of transducer elements. Before significant aging effects degrade measurement precision, the system proactively detects changes in transducer performance through the alternating excitation-detection scheme and applies compensations to maintain accuracy throughout the operational lifespan.
Data Source
AI summary
A method and apparatus for measuring and/or monitoring at least one flow parameter of a medium, which medium flows through a measuring tube, wherein the measuring tube is contacted by at least two transducer elements, by means of which the measuring tube is excitable to execute mechanical oscillations and by means of which mechanical oscillations of the measuring tube are receivable. Each of the at least two transducer elements is applied, offset in time, alternately, for exciting the measuring tube to execute mechanical oscillations and for receiving the mechanical oscillations of the measuring tube.