Scanning SQUID microscope system for geological samples: system integration and initial evaluation

Earth, Planets and Space

Table 1 Parameters for a pair of point sources used in registering magnetic image relative to optical image

Point source		X (mm)	Error (1σ)	Y (mm)	Error (1σ)	Z (mm)	Error (1σ)	M (Am²)	Error (1σ%)	Dec (°)	Error (1σ)	Inc (°)	Error (1σ)
A	NRM	3.803	0.002	2.694	0.003	−0.266	0.003	2.04E−10	2.8	171.5	0.7	−2.1	0.7
	AFD 10 mT	2.370	0.001	2.555	0.001	−0.264	0.001	2.13E−10	0.9	171.3	0.2	0.2	0.2
	AFD 20 mT	2.756	0.002	2.638	0.002	−0.213	0.003	2.03E−10	1.0	171.0	0.3	0.4	0.3
	ARM (+X)	2.519	0.001	2.259	0.001	−0.275	0.001	2.16E−10	0.8	171.2	0.2	0.1	0.2
	ARM (+Y)	2.737	0.002	2.035	0.003	−0.280	0.003	2.27E−10	2.4	170.6	0.6	0.3	0.6
	ARM (−Z)	2.669	0.002	1.839	0.002	−0.258	0.002	2.20E−10	1.9	168.6	0.4	1.1	0.5
	Average	2.809		2.336		−0.259		2.14E−10
	STD	0.509		0.349		0.024		9.22E−12
B	NRM	63.702	0.002	27.048	0.002	−0.757	0.003	2.50E−10	1.2	97.4	0.2	−2.3	2.0
	AFD 10 mT	62.20	0.005	26.831	0.004	−0.881	0.007	2.65E−10	1.9	99.1	0.4	−2.1	0.3
	AFD 20 mT	62.678	0.005	26.754	0.005	−1.032	0.009	2.75E−10	2.2	99.6	0.4	−3.4	0.3
	ARM (+X)	62.345	0.007	26.480	0.006	−1.204	0.012	3.08E−10	2.7	99.8	0.5	−6.0	0.4
	ARM (+Y)	62.476	0.003	26.209	0.002	−0.831	0.004	2.57E−10	1.3	97.4	0.2	−3.0	0.2
	ARM (−Z)	62.657	0.003	26.189	0.004	−0.772	0.004	2.48E−10	1.3	97.1	0.3	−2.9	0.2
	Average	62.677		26.585		−0.913		2.67E−10
	STD	0.534		0.350		0.174		2.24E−11
Difference	NRM	59.899		24.354		−0.491
	AFD 10 mT	59.833		24.276		−0.617
	AFD 20 mT	59.922		24.116		−0.819
	ARM (+X)	59.826		24.221		−0.929
	ARM (+Y)	59.739		24.174		−0.552
	ARM (−Z)	59.988		24.350		−0.514
	Average	59.868		24.249		−0.654
	STD	0.087		0.096		0.179

Error means the error expected for the position optimized by magnetic image assuming a magnetic dipole
A lower-left point source, B upper-right point source, Difference subtracted A from B
STD standard deviation, M intensity of magnetic moment
dec declination (clockwise from +x direction), inc inclination (positive for lower hemisphere)