QDMlab: A MATLAB toolbox for analyzing quantum diamond microscope (QDM) magnetic field maps

作     者：Volk, Michael W. R. Fu, Roger R. Trubko, Raisa Kehayias, Pauli Glenn, David R. Lima, Eduardo A. 

作者机构：Harvard Univ Dept Earth & Planetary Sci 20 Oxford St Cambridge MA 02138 USA Worcester Polytech Inst Dept Phys 100 Inst Rd Worcester MA 01609 USA Sandia Natl Labs Albuquerque NM 87123 USA Harvard Univ Dept Phys 17 Oxford St Cambridge MA 02138 USA MIT Dept Earth Atmospher & Planetary Sci 77 Massachusetts AveBldg 54 Cambridge MA 02139 USA 

出 版 物：《COMPUTERS & GEOSCIENCES》 (计算机与地学)

年 卷 期：2022年第167卷

核心收录：

学科分类：08[工学] 0708[理学-地球物理学] 0812[工学-计算机科学与技术（可授工学、理学学位）] 

基　　金：National Science Foundation (NSF), USA Grants [PHY-1843727, EAR-1847042, DMS-1521765] NASA, USA [NNX15AH72G] 

主　　题：Magnetic microscopy Quantum diamond microscope MATLAB toolbox Rock magnetism 

摘      要：Paleomagnetic measurements of rock magnetizations are typically performed using classical net moment rock magnetometers on bulk, millimeter- to centimeter-sized samples. In this case, the limited spatial resolution effectively averages across the signal of multiple populations of magnetic grains, each of which may have a distinct geological history. Magnetic field imaging with the quantum diamond microscope (QDM) allows for the measurement of weakly magnetic (10(-16) Am-2) samples at micrometer spatial resolution, potentially isolating the signal of magnetic grain populations and resolving ambiguities from bulk sample analyses. To achieve such high resolution, the QDM retrieves the energy spectrum of nitrogen-vacancy (NV) color centers within micrometer-scale pixels across a millimeter-scale field of view. Therefore, large amounts of data need to be processed to generate a magnetic field map, which itself often requires further specialized analysis. Until now, no freely-available, comprehensive, open-source software package existed that was able to process this type of data. Here we give an overview of the most important features of QDMlab, our open-source MATLAB toolbox for generating and analyzing QDM magnetic field maps of geologic samples. *** utilizes modern computational techniques like graphics processing unit (GPU) and spectral fitting routines as well as automated image alignment algorithms. QDMlab contains easy-to-use functions for (1) generating magnetic field maps from raw QDM data, (2) map editing, and (3) quantifying the net magnetic moment and rock magnetic properties of rock and mineral samples.