Frequency selection method for frequency-mixing ultrasonic flowmeter
The frequency selection method in ultrasonic flow meters dynamically switches between ToF and PWD methods based on signal strength, addressing inaccuracies in conventional ultrasonic flow meters due to varying liquid states, ensuring precise flow rate measurement in diverse liquid conditions.
JP2025146560AActive Publication Date: 2025-10-03FINETEK CO LTD
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Patent Information
- Application Number
- JP2024083913
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- Priority Date
- 2024-03-22
- Filing Date
- 2024-05-23
- Publication Date
- 2025-10-03
- Estimated Expiration
- 2044-05-23
AI Technical Summary
Technical Problem
Conventional ultrasonic flow meters struggle with inaccurate measurements when liquids contain foreign matter or are opaque, as they are not dynamically adaptable to varying liquid states.
Method used
A frequency selection method for ultrasonic flow meters that dynamically determines whether to use the Time of Flight (ToF) or Pulsed Wave Doppler (PWD) method based on real-time signal strength, using a frequency-mixing approach to combine both methods for accurate flow rate measurement.
Benefits of technology
Enables accurate and reliable flow rate measurement in both single-phase and multi-phase liquids by adaptively selecting the appropriate measurement method, enhancing measurement precision and reliability.
✦ Generated by Eureka AI based on patent content.
Abstract
To provide a frequency selection method for a frequency-mixing ultrasonic flowmeter that can dynamically adapt to the measurement of flow velocity and flow rate of various liquids with different properties.SOLUTION: A first sensor and a second sensor are controlled to respectively transmit frequency-mixing wave signals in a pipe, and a first flow velocity of the liquid in the pipe is calculated based on a time-difference method, where the frequency-mixing wave signal includes three different frequencies. By controlling either the first sensor or the second sensor to transmit a waveform signal containing a fixed frequency in the pipe, a second flow velocity of the liquid in the pipe is calculated based on a Doppler method, and the intensity of the Doppler signal is determined. When the intensity of the Doppler signal is smaller than a first threshold, the first flow velocity is output. When the intensity of the Doppler signal is greater than a second threshold, the second flow velocity is output. When the intensity of the Doppler signal is between the first and second thresholds, it is determined, by referring to a table, whether to output the first or second flow velocity.SELECTED DRAWING: Figure 5
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