Method for measuring concentration of solid or liquid...

Details Method for measuring concentration of solid or liquid... Method for measuring concentration of solid or liquid...

2006-06-27

2006-06-27

Williams, Hezron (Department: 2856)

Measuring and testing

Gas analysis

By vibration

C073S028010

Reexamination Certificate

active

07066008

ABSTRACT:
A method of measuring concentration of solid or liquid particulate matter in a gaseous carrier medium, particularly suitable for measuring concentration and flow rate of pulverized fuel pneumatically transported in a duct to power station boiler burners. The method includes generating a radio frequency electromagnetic wave within a duct, measuring wave parameters within a range of frequencies, including a cut-off frequency, determining the cut-off frequency from changes in wave parameters, calculating dielectric permittivity of a two-phase flow duct load, and ascribing to this value a corresponding concentration value. The measured parameter is the rate of change of phase shift against frequency at two arbitrary points on a wave transmission path, whereas the waveguide cut-off frequency value is determined at a point where the rate of change of phase shift against frequency reaches a maximum.

REFERENCES:
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patent: 5729470 (1998-03-01), Baier et al.
patent: 6109097 (2000-08-01), Conrads et al.
patent: 6119510 (2000-09-01), Carasso et al.
patent: 6490909 (2002-12-01), Boguszewski et al.
patent: 0 717 269 (1996-06-01), None
patent: WO 99/01752 (1999-01-01), None

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