Many of the modern concrete structures such as sea-links and bridges are built in water. They require structural health monitoring (SHM) and audit to ascertain the quality and estimation of remaining useful life. To meet these requirements, a single-channel ultrasonic imaging system has been designed and developed to detect defects, porosities and rebar locations inside the Concrete/ Reinforced Cement Concrete (RCC) structures. This real-time and reconfigurable embedded system was evaluated by carrying out under-water imaging of Concrete and RCC test blocks. Conventionally, Ultrasonic Pulse Velocity (UPV) method is being utilized over three decades in Transmit-Receive (T-R) mode to estimate the density and strength of the concrete structure under test. UPV method requires a skill to interpret the data provided by the UPV instrument. The novelty of the single-channel system discussed in this paper is that it is capable of inspecting Concrete/ RCC structures both in Pulse Echo (PE) as well as in T-R mode. An application software has been developed using C# in a visual environment for image acquisition and the control of Data Acquisition (DAQ) hardware has been interfaced to the computer via USB. The imaging system performs data acquisition and coherent averaging of the RF bipolar data to achieve Signal-to-Noise Ratio (SNR) higher than 20 dB. The performance of the system was evaluated by acquiring B-Scan images of the water submerged concrete test blocks having Side Drilled Hole (SDH) and RCC blocks with one as well as two steel rebars, using 54 kHz water immersion transducer in PE mode. The acquired B-Scan images have revealed the internal details of the sample test blocks, resembling the defects generated in the test blocks. High voltage tone burst bipolar pulser with maximum output of (350 V) has been specifically designed for this system to inspect highly attenuative porous and non-homogeneous Concrete/ RCC materials for the detection of SDH and reinforced steel bars in the concrete test blocks, using B-Scan imaging technique.

许多现代混凝土结构，如海路和桥梁，都是建在水中的。它们需要结构健康监测 (SHM) 和审计，以确定剩余使用寿命的质量和估计。为了满足这些要求，我们设计并开发了一种单通道超声成像系统来检测混凝土/钢筋水泥混凝土 (RCC) 结构内的缺陷、孔隙率和钢筋位置。通过对混凝土和 RCC 测试块进行水下成像，对这种实时且可重构的嵌入式系统进行了评估。传统上，超声波脉冲速度 (UPV) 方法在发射 - 接收 (TR) 模式中使用了 30 多年，以估计被测混凝土结构的密度和强度。UPV 方法需要一种技能来解释 UPV 仪器提供的数据。本文讨论的单通道系统的新颖之处在于它能够在脉冲回波 (PE) 和 TR 模式下检查混凝土/RCC 结构。已在可视化环境中使用 C# 开发了用于图像采集的应用软件，并且数据采集 (DAQ) 硬件的控制已通过 USB 连接到计算机。成像系统对射频双极数据执行数据采集和相干平均，以实现高于 20 dB 的信噪比 (SNR)。通过在 PE 模式下使用 54 kHz 水浸传感器获取具有侧钻孔 (SDH) 的水浸混凝土试块和具有一根和两根钢筋的 RCC 块的 B 扫描图像来评估系统的性能。获得的B-Scan图像揭示了样品试块的内部细节，类似于测试块中产生的缺陷。最大输出为 (350 V) 的高压音爆双极脉冲发生器专为该系统设计，用于检测高衰减多孔和非均质混凝土/RCC 材料，以检测混凝土试块中的 SDH 和钢筋，使用B 扫描成像技术。