Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Distributive type parameters
Patent
1996-02-12
1997-12-16
Brown, Glenn W.
Electricity: measuring and testing
Impedance, admittance or other quantities representative of...
Distributive type parameters
324642, 330 56, 333227, G01N 2200, G01N 2700, H01P 710, H03H 900
Patent
active
056989865
ABSTRACT:
A cylindrical microwave cavity 12 has a pinched center 28, 30. Two apertures 28, 30, one in the center. of each face of the cylinder 10, provide access for a gas/powder mixture 124 having a dielectric coefficient depending on its density or some other measurement of interest. The faces 20, 22 of the cylinder 10 are much farther apart at the unpinched periphery, which comprises most of the volume of the cavity. The wider spacing allows an antenna 34 to be placed in the cavity 12, and provides a high Q-factor to maximize the sensitivity of the cavity 12. At the same time, certain resonance modes are greatly affected by a change in the dielectric coefficient of the gas/powder mixture 124 in the pinched portion 28, 30. The density of the powder or any other convenient variable may thus be servoed to any desired value. The powder 124 may be blown through the cavity 10, encased in tube 120 affixed to the cavity 12. Alternatively, the tube 104 may be formed around the powder 98, and the tube and powder passed through the cavity 12 together. This latter alternative is especially practical in the manufacture of tobacco cigarettes.
REFERENCES:
patent: 3757204 (1973-09-01), Hyde
patent: 3783373 (1974-01-01), Jawor
patent: 4350883 (1982-09-01), Lagarde
patent: 4700145 (1987-10-01), Yelland et al.
patent: 4942363 (1990-07-01), Lowitz
patent: 5027090 (1991-06-01), Gueble et al.
patent: 5194815 (1993-03-01), Maeno
Goldberg Ira B.
Mays David L.
Allen-Bradley Company Inc.
Brown Glenn W.
Horn John J.
Miller John M.
Streeter Tom
LandOfFree
Cigarette density monitor does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Cigarette density monitor, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Cigarette density monitor will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-210528