Communications: electrical – Condition responsive indicating system – With particular system function
Patent
1972-12-13
1983-01-11
Tubbesing, T. H.
Communications: electrical
Condition responsive indicating system
With particular system function
340552, 340566, 343 5PD, G08B 1318
Patent
active
043684602
ABSTRACT:
A dual mode sensor having a seismic channel and an RF channel with a logic circuit recognizing both channels. The seismic channel detects disturbances with a geophone and determines the spacing and the density of the impulses while the RF channel radiates electromagnetic energy and detects impedance changes in the oscillator circuit driving the antenna when the target is in the field. The rates of changing impedances and their thresholds are determined.
REFERENCES:
patent: Re25100 (1961-12-01), Chapin
patent: 3573817 (1971-04-01), Akers
patent: 3717864 (1973-02-01), Cook et al.
patent: 3727216 (1973-04-01), Antonio
Clinard Glenn G.
Guth Kenneth C.
Mulhollam Gail R.
Volk Frank J.
Siegel Julian L.
Singer Donald J.
The United States of America as represented by the Secretary of
Tubbesing T. H.
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