In order to ensure the safety of the environment during hydrocarbon extraction operations, downhole nondestructive testing of the well casings is of the utmost importance. To this purpose, rotating field eddy current has been recently proposed as an alternative to the state-of-the-art array sensors and mechanically rotating sensors. In this paper, we present an analytical approach to modeling of such a sensor. We study the sensor sensitivity to the small defects by coupling the model with the dipole-based model of small defects.
Handheld electromagnetic induction (EMI) sensors used for detection of buried landmines typically employ planar sensor head geometries comprised of a single transmitter and one or more receiver coils. Such configurations have dominant sensitivities oriented in a single direction and are therefore well-suited for metal detection. However, when one tries to characterize the target with a planar EMI sensor, e.g. reconstruct the parameters of an induced dipole model, the problem becomes challenging, since the target needs to be interrogated by all three orthogonal field components in order to obtain unambiguous results. Sweeping the sensor over a target helps with this issue, since the target gets magnetically illuminated from different directions, however a downside is that the sensor head position needs to be known in a ground reference frame, at each scan location. Although various solutions for sensor head position tracking have been reported, they are all more or less obtrusive when used in field conditions. Also, such systems introduce additional uncertainties, often with non-normal distributions, thus complicating inversion procedures. In this paper, we investigate an alternative approach to dipole-based target characterization, where the problem is analyzed in a moving, sensor-based reference frame by dynamically processing sensor data at each scan location using the extended Kalman filter. For a chosen planar coil geometry and scan pattern, we first analyze the basic stability of a filter, with an emphasis on its local observability. We then show how the target's magnetic polarizabilities and target-to-sensor distance can be simultaneously estimated using EMI data only.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.