Patent ID: 8305082

Claim:
A method of calibrating a system having a plurality of transmitters and a plurality of receivers for making multicomponent induction measurements, the method comprising: positioning the system above the surface of the earth; orienting the system so that an axis of one transmitter of the plurality of transmitters is substantially parallel to the surface of the earth and substantially collinear with an axis of one receiver of the plurality of receivers; obtaining multicomponent measurements at at least one frequency and at least one rotational angle φ about a longitudinal axis of the system at a single height above the surface of the earth; determining from only the multicomponent measurements made at the single height, without using a measurement from a height other than the single height, an indication of a calibration error in at least one of the multicomponent measurements; wherein the determining the indication of the calibration error comprises using a relation of the form: H xx =H yy +H zz where H xx , H yy and H zz are magnetic field measurements wherein the first subscript refers to a transmitter orientation, the second subscript refers to a receiver orientation and z is along the longitudinal axis of the system; and recording the indication of the calibration error on a suitable medium.