Figure 2: Real-time in situ cracking microscopic visualization monitoring system: (a) schematic of the test system, (b) AE monitoring system, and (c) microscopic visualization monitoring system. Note: (1) long working distance microscope, (2) C-mount interface, (3) high-speed video camera, (4) precision electric mobile platform, (5) image acquisition and control system, (6) stepping motor controller, and (7) shock absorbing ground support.