Seismic surveillance system

Details Seismic surveillance system Seismic surveillance system

1974-06-25

1976-02-24

Wilbur, Maynard R.

Communications: electrical

Selective

Having electron beam device

340 16R, 340258B, H04B 1100, G01S 380

Patent

active

039407330

ABSTRACT:
A seismic surveillance system for detecting intruders, and the like. A seic transmitter coupled to the trunk of a tree establishes a seismic field in the earth via the roots of the tree. A seismic receiver similarly coupled to another tree detects the field and the presence of an intruder on the earth in which the field is established is detected by noting changes in the phase, amplitude, or frequency of the seismic field.

REFERENCES:
patent: 1549032 (1925-08-01), Squier
patent: 3302746 (1967-02-01), Ikrath
patent: 3646562 (1972-02-01), Acker et al.

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