Sensor Response Estimate and Cross Calibration of Paleomagnetic Measurements on Pass-Through Superconducting Rock Magnetometers

Abstract

Pass-through superconducting rock magnetometers (SRMs) enable rapid and precise remanence measurement of continuous samples and are essential for paleomagnetic studies. Due to convolution effect of the SRM sensor response, pass-through measurements need to be deconvolved to restore accurate and high-resolution signal. A key step toward successful deconvolution is a reliable estimate of the SRM sensor response. Here, we present new tool URESPONSE for accurate SRM sensor response estimate based on measurements of a well-calibrated magnetic point source. URESONSE allows sensor response to be estimated for continuous samples with different cross-section geometry. We estimate sensor responses for an old liquid helium-cooled SRM (SRM-old) and a new liquid helium-free SRM (SRM-new) at the University of Southampton and compare remanence measurement of a u-channel on both SRMs before and after deconvolution. For each SRM, sensor response estimates based on data collected using different magnetic point source samples and/or measurement procedures generally yield small differences (std.