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Block diagram of the imaging system and the control circuit. (a) Imaging System and (b) Control Circuit. Abbreviations: personal computer (PC), control circuit (Func), data acquisition card (DAQ), oscilloscope (OSC), fast photodetector (PD), polarizers (P), beam splitter (BS), coupling lens (CL), multi-mode fiber (MMF), objective lens (OL), opto-acoustic combiner (OAC), ultrasonic transducer (UT), water tank (WT), amplifiers (Amp), DAQ general-purpose input/output (DAQ I/O)
