Open cage density sensor

Details Open cage density sensor Open cage density sensor

1990-01-29

1991-06-25

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

324690, 73 32R, G01R 2726, G01N 900

Patent

active

050270761

ABSTRACT:
A light-weight density sensor has a rigid open structure that does not impede fluid flow and provides the ability to accurately and reproducably measure dielectric constant and densities over long distances without interference from connecting coaxial cables during periods of vibration and thermal shock. A novel immersion cell and an oscillator circuit provide a variable frequency output related to the dielectric constant of the cryogen within the immersion cell and from which the density of the cryogen can be determined. The immersion cell comprises an elongated electrode located centrally within an open outer electrode formed by a plurality of elongated conductors spaced around and from the central electrode conductor. The open outer electrode does not impede the flow of cryogen into the immersion cell and by its structure permits accurate density determinations dependent upon the dielectric constant of cryogen present within the cell.

REFERENCES:
patent: 3421077 (1969-01-01), Liu et al.
patent: 3437924 (1969-04-01), Tocanne
patent: 4177669 (1979-12-01), Wenger
patent: 4284951 (1981-08-01), Dahl et al.
patent: 4543823 (1985-10-01), Nagy et al.
patent: 4555661 (1985-11-01), Benson et al.
patent: 4835456 (1989-05-01), Lin et al.

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