Flow rate measurement device
US8548755B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 25, 2009 |
| Grant date | Oct 1, 2013 |
| Priority date | — |
| Expiry date | Dec 13, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01F1/667
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Switching a transmitting and receiving direction of two transducers (2,3) in the forward and the reverse direction, a time differential memory part (17b) storing a propagation time differential every K times a unit measurement process being executed, the propagation time differential being a differential between a propagation time of the ultrasonic wave signal in a forward direction and in a reverse direction, a flow rate calculating part (15) calculating a flow rate of a passing fluid based on a lump sum of propagation times in both the forward and the reverse directions obtained at least every K times of a unit measurement process being executed, an estimating part (18) estimating a change in a momentary flow rate of the fluid based on the time differential obtained every K times of the unit measurement process being executed and storing thereof in a time differential memory part (17b), thus obtaining an accurate flow rate and detecting the change in the momentary flow rate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.