Proximity monitor

Details Proximity monitor Proximity monitor

1981-05-21

1983-12-20

Tubbesing, T. H.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

102212, 102214, 343 5PD, 343 7PF, G01S 1386, F42C 1304

Patent

active

044220758

ABSTRACT:
A proximity monitor for movement at a selected distance from a surface, including a first microwave sensor having an antenna pattern directed toward the surface, the principal component of the pattern parallel to the surface being in the direction of the movement, a second microwave sensor having a second antenna pattern directed toward the surface, the principal component of the second pattern parallel to the surface being at a direction opposite to that of the movement, and the patterns being mutually spaced at the surface in the direction of movement, a magnetic anomaly sensor giving an output representative of the presence at the surface of a magnetic anomaly located between the patterns, and apparatus connected to the sensors for performing a control function when the signals from the sensors are above predetermined levels in a predetermined time relationship.

REFERENCES:
patent: 3026805 (1962-03-01), Becker
patent: 3902172 (1975-08-01), Weiss et al.
patent: 3913485 (1975-10-01), Holmes et al.
patent: 3942447 (1976-03-01), Van Orsdel
patent: 4185560 (1980-06-01), Levine
patent: 4193072 (1980-03-01), McKusick
patent: 4368460 (1983-01-01), Clinard et al.

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