Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Distributive type parameters
Patent
1988-08-01
1990-02-06
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Impedance, admittance or other quantities representative of...
Distributive type parameters
324 714, 324633, G01R 2704
Patent
active
048991007
ABSTRACT:
A nondestructive apparatus and method for measuring the mass of a moving object, based on the perturbation of the dielectric character of a resonant microwave cavity caused by the object passing through the cavity. An oscillator circuit is formed with a resonant cavity in a positive feedback loop of a microwave power amplifier. The moving object perturbs the resonant characteristics of the cavity causing a shift in the operating frequency of the oscillator proportional to the ratio of the pellet volume to the volume of the cavity. Signals from the cavity oscillation are mixed with a local oscillator. Then the IF frequency from the mixer is measured thereby providing a direct measurement of pellet mass based upon known physical properties and relationships. This apparatus and method is particularly adapted for the measurement of frozen hydrogen pellets.
REFERENCES:
patent: 3437922 (1969-04-01), Miller
patent: 4042879 (1977-08-01), Ho
patent: 4050015 (1977-09-01), Zollner
patent: 4277741 (1981-07-01), Faxvog
patent: 4369404 (1983-01-01), Flygare
Wenger; "Hydrogen Density Measurements Using an Open Ended Microwave Cavity"-IEEE Trans. on Instrumentation-May 72.
Greenwald Martin
Talanker Vera
Eisenzopf Reinhard J.
Gottlieb Paul A.
Jolis Jose M.
Kozak Frank J.
Moser William R.
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