Ultrasonic transducers using adaptive multi-frequency hopping and coding
US10564016B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 19, 2018 |
| Grant date | Feb 18, 2020 |
| Priority date | — |
| Expiry date | Aug 28, 2038 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01P5/245
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An ultrasonic flow meter (UFM) includes a first and second ultrasonic transducer for attaching to a pipe, and a transceiver coupled to the transducers by a multiplexer. A controller having an associated memory runs an adaptive multi-frequency hopping and coding algorithm that selects ≥1 frequency to be hopped within the measured transducer impedance spectrum using a threshold level that selects at least a peak for the phase or a valley for the magnitude, and selects a coding scheme for the chosen frequency to provide a coded frequency sequence. A received signal generated responsive to an ultrasonic signal with the coded frequency sequence into the fluid is decoded, and peak detection is performed on the decoded received signal. The travel time is calculated from the decoded signal, and a speed of the fluid is then determined from the travel time.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.