PASSIVE UNDERGROUND ELECTRONIC MARKER FOR USE IN ANY ORIENTATION

摘要

A passive electronic marker comprising a single tuned LC circuit, having an inductance and one capacitance element, that respond substantially uniformly to a marker locating instrument irrespective of the orientation the marker was installed in. The inductance is split among more than one electrically contiguous coils; each of the coils is oriented in different axes along the three dimensional space to achieve the substantially uniform response to a marker locating instrument. The tuned circuit is enclosed in a protective housing that may or may not help in the orientation of the marker during burying. The passive marker is of a type that is buried relative to portions of an object for use in locating such objects when necessary.