Fig. 4
From: Scanning SQUID microscope system for geological samples: system integration and initial evaluation
Schematic diagram of our scanning SQUID microscope system. SQUID sensor of the SQUID microscope (a) is connected to flux-locked loop (b), which has its own power supply (c). For tuning, a function generator (d) supplies a 0.2-Hz signal and an oscilloscope (e) monitors the signal of SQUID sensor. The XYZ stage controller is composed of a motor controller (g) for controlling the stepping motors (i) of the XYZ stage, and an ADC (f) for digitizing the signal of the SQUID output. The XYZ stage controller can also be operated by a remote controller (h). Software program SQUID MagScan installed on the PC (j) controls the XYZ stage and acquires the SQUID signal (magnetic field in nT) via a USB cable connected to the XYZ stage controller. He gas flow is measured by a flow sensor (k) and monitored by a flow meter (l). He level can be monitored by pressing a button on the He level meter (m). Inset sample distance from the sensor can be measured using the line current (n) with precision current supply (o)