Densitometer
US5900534A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 7, 1996 |
| Grant date | May 4, 1999 |
| Priority date | — |
| Expiry date | Oct 7, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N9/002
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A densitometer (10) includes a gas sample plenum (40) that is connected to a gas supply pipe (26) via a flow-restricted inlet duct (42) to at least partially isolate and damp the sample plenum (40) from shocks and noises, turbulences, and abrupt pressure changes in the gas supply. A cantilevered vane (110) is positioned in the sample plenum (40) for gas density determinations on the principle that resonant frequency of the vane (110) is a function of the density of the gas in the sample plenum (40). The resonant frequency of the vane (110) in the gas is determined by applying a magnetic field generated by a driver assembly 120 against the vane (110) and detecting the resonant frequency with a vibration detector (117), which is connected to the driver assembly 120 in a phase locked loop.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.