Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1985-04-12
1987-08-25
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
324 585B, 414 5, 73149, G01R 2704, G01F 1700
Patent
active
046895531
ABSTRACT:
A system and method for monitoring position of a piston within a fluid-actuated cylinder by radiating microwave energy into the actuator cylinder and measuring axial position of the piston as a function of microwave resonances and the frequencies at which such resonances occur. Separate microwave transmitting and receiving antenna probes are mounted on one end cap of the actuator cylinder, which has a fixed diameter and an axial dimension which varies as a function of piston position. The transmitting probe is coupled to an oscillator which is controlled to sweep a predetermined frequency range for generating one or more TM.sub.01q resonant modes within the cylinder cavity. A threshold detector and a peak detector are coupled to the receiving probe for detecting occurrence of cavity resonances. Latches store oscillator control signals associated with occurrence of up to eight such resonance events, with the stored control signals thus being an indication of resonant frequencies. A microprocessor is programmed to determine cavity length and piston position as a combined function of such resonant frequencies and the corresponding orders q of each frequency.
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Mark K. Krage, "Locating Piston Position in Penumatic/Hydraulic Cylinders Using Microwaves" (GMR Report) ET-281, 1981.
Eisenzopf Reinhard J.
Jodon Engineering Associates, Inc.
Solis Jose M.
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