PULSED FIELD SYSTEM FOR DETECTING THE PRESENCE OF A TARGET IN A SUBSURFACE ENVIRONMENT
Assignee
Filed
Apr 23, 1979
Granted
Jun 18, 1991
Location
CA US
Abstract
In a method and apparatus for searching a subsurface environment to detecthe presence of a target therein, an electromagnetic field is emitted which comprises successive electromagnetic pulses of selected duty cycle, the time interval between pulses comprising a zero emission interval and a sampling interval, the sampling interval following the zero emission interval, and the polarity of the pulses of the emitted field alternating at a selected alternating frequency. The emitted field is projected into the environment from a selected location, and the electromagnetic field proximate to the selected location is sampled during each of the sampling intervals to provide a train of proximate field samples. The train of proximate field samples is spectrum analyzed to determine whether or not the field proximate to the selected location contains a component having a frequency which is equal to the alternating frequency.
Source: Google Patents
35 USC §181 Secrecy Order
Imposed
Oct 2, 1981
Rescinded
Nov 1, 1990
Duration
9 years, 1 month
Inventor
- 1CLARENCE F. RAMSTEDT
Record Details
- Patent number
- US 5025218
- Application
- 06032815
- Aerospace match
- Yes
- Dataset source
- 35 USC §181 SO records
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