Temperature-Driven Ultrasonic Transducer Calibration for Flowmeters
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Ultrasonic transducers in flowmeters exhibit sensitivity variations with frequency and temperature, affecting the accuracy of fluid flow measurements.
Innovation Solution
A temperature-based calibration process is performed by sweeping transducer frequencies to determine the frequency corresponding to maximum sensitivity, dynamically adjusting the excitation frequency based on fluid temperature, using a computer-readable storage device and CPU cores to execute machine instructions for fluid flow measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If ultrasonic transducers operate at a fixed excitation frequency, then the device complexity is reduced, but the measurement precision deteriorates due to temperature-induced sensitivity changes
Solution Approach 1:
The patent implements dynamic frequency adjustment by performing temperature-based calibration that sweeps through a range of frequencies to identify the optimal excitation frequency for current temperature conditions. The system dynamically updates the excitation frequency based on real-time temperature measurements, transforming the static fixed-frequency operation into adaptive dynamic operation to maintain measurement precision across varying temperatures
Solution Approach 2:
The system changes the operating frequency parameter based on temperature conditions. By sweeping through multiple frequencies during calibration and selecting the frequency that maximizes transducer sensitivity for the current temperature, the system adapts the frequency parameter to compensate for temperature-induced sensitivity variations, thereby maintaining measurement accuracy
2Measurement precision
If the excitation frequency is dynamically adjusted based on temperature calibration, then the measurement precision is improved, but the productivity decreases due to additional calibration time
Solution Approach 1:
The system performs temperature-based calibration in advance to determine the optimal excitation frequency before actual flow measurements begin. By pre-establishing the frequency-temperature relationship through calibration sweeps and storing the optimal frequency for current temperature conditions, the system prepares measurement parameters beforehand, ensuring accurate measurements without delaying the actual flow measurement process
Solution Approach 2:
The calibration process is implemented periodically or at scheduled intervals to update the excitation frequency based on changing temperature conditions. Rather than continuously sweeping frequencies during measurement, the system performs calibration at appropriate intervals to maintain precision while minimizing the time impact on overall productivity
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 process ensures accurate and dynamic fluid flow rate measurements by identifying the optimal excitation frequency, compensating for temperature-induced sensitivity changes in ultrasonic transducers.
Implementation Method 1
an ultrasonic signal is injected into the fluid flow
Implementation Method 2
the absolute time-of-flight (TOF) is determined in the downstream direction
Implementation Method 3
The difference in the TOFs between the upstream and downstream direction can be used to compute the velocity of the fluid flow
Data Source
AI summary
A computer-readable storage device stores machine instructions which, when executed by one or more central processing unit (CPU) cores, causes the one or more CPU cores to use a first ultrasonic transducer and a second ultrasonic transducer to measure fluid flow using a current measurement frequency and to perform a temperature calibration process. The temperature calibration process includes the sequentially generation of a plurality of electrical signals for the first ultrasonic transducer, the generated electrical signals each having a different frequency. For each frequency, the temperature calibration process includes the measurement of an amplitude of a signal from the second ultrasonic transducer. Based on the measured amplitudes of the signals from the second ultrasonic transducer, the temperature calibration process includes the determination of a new measurement frequency. The first and second ultrasonic transducers are used to measure fluid flow using the new measurement frequency.