Densitometer

Details Densitometer Densitometer

1996-10-07

1999-05-04

Biegel, Ronald L.

Measuring and testing

Gas analysis

By vibration

7386101, G01F 168

Patent

active

059005343

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.

REFERENCES:
patent: 2754676 (1956-07-01), Poole
patent: 3420092 (1969-01-01), Dorsch
patent: 3516283 (1970-06-01), Abbotts
patent: 3618360 (1971-11-01), Curtis
patent: 3874221 (1975-04-01), Lockie
patent: 4240285 (1980-12-01), Langdon
patent: 4453401 (1984-06-01), Sidey
patent: 4546641 (1985-10-01), Nguyen

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