Device for determining mass air flow in a conduit
US3964309A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 20, 1975 |
| Grant date | Jun 22, 1976 |
| Priority date | — |
| Expiry date | May 20, 1995 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01F1/662
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An ultrasonic device for determining the air flow rate in a conduit, comprising a duct, which may form part of the conduit or may be connectable thereto, at each end of which is a respective enlarged cylindrical chamber communicating axially with the duct and housing a respective piezoelectric transducer. In use of the device the piezoelectric transducers both transmit ultrasonic signals towards each other along the duct and the air speed in the duct is determined by the difference in transit times of the ultrasonic signals in the two directions. The air flow through the chambers is largely radial and the piezoelectric transducers are located axially at positions where the air speed is very low to minimize disturbances thereto.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.