Hydraulic actuator having a microwave antenna

Details Hydraulic actuator having a microwave antenna Hydraulic actuator having a microwave antenna

1985-10-09

1990-02-20

Green, Randall L.

Expansible chamber devices

With inspection window in expansible chamber wall portion

With lock

91 1, 324639, 324642, G01R 2706, F15B 1528

Patent

active

049016288

ABSTRACT:
A microwave method and apparatus for detecting the position of a piston of a pneumatic cylinder. While the piston is being moved by fluid pressure a microwave signal is applied to a cavity defined by the piston and interior of the cylinder and the reflected microwave signal is detected. The reflected microwave signal is processed to determine piston position.

REFERENCES:
patent: 3238850 (1966-03-01), Desmarchelier
patent: 3589177 (1971-06-01), Merlo
patent: 3654549 (1972-04-01), Maurer et al.
patent: 4384480 (1983-05-01), Krage et al.
patent: 4403504 (1983-09-01), Krage et al.
"Aeroquip T-J Lesa I," Product brochure, Aeroquip Corporation, Jackson, Mich. 1984.
Martin, D. "New Applications Open for Reciprocal Frequency Counters," in EDN, Oct. 5, 1974, pp. 44-47.
Jacobson, R. et al., "Microwave Distance Meter with .+-.2.5 mm Resolution," in Conference Proceedings, 5th Europ. Microwave Conf., Sep. 1-4, 1975, pp. 203-207, England: Megaron Press Ltd.

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