Ultrasonic camera: a matrix-based real-time ultrasonic imaging system for immersion applications

Abstract

The novel matrix-based real-time ultrasonic imaging using an ultrasonic camera for immersion application has been proposed in this paper. The proposed ultrasonic camera provides real-time images of mechanical components and the image size is equal to the field of view of the developed matrix-based transducer assembly. For the matrix-based ultrasonic imaging, the addressing-based analog multiplexing scheme has been proposed in such a way that all channels of the specific row are selected simultaneously such as the transducer excitation, data acquisition, data processing and transferring operations are performed concurrently. Similarly, the same operations are performed for remaining all rows sequentially. The developed ultrasonic camera further supports dynamic on-line reconfiguration of the analog front-end hardware, real-time hardware/software-based data processing and data transfer operation. For the experimentation, the entire matrix-based (5 × 5) ultrasonic imaging system for immersion applications has been designed, developed and evaluated in the laboratory. Here we present the performance evaluation of the developed matrix-based ultrasonic camera system by acquiring the real-time images of the water-immersed mechanical objects.

Embedded system for ultrasonic imaging of under-water concrete structures

“…The low voltage (LV) DC power supplies (+5 V, −5 V, +12 V) are provided by the switched-mode power supply (SMPS) and in-house developed two boards of variable high voltage (HV) DC supply (0 to ±350 V) have been utilized to supply +HV and -HV DC supplies to Metal-Oxide-Semiconductor Field-Effect Transistors (MOSFETs). In most of the NDT applications, spike pulser is employed for the generation of ultrasound because of its wide band response [19,20]. For the imaging system described in this paper, the bipolar pulser with narrow-band response has been utilized, which provides comparatively higher energy for the same voltage rating of spike pulser and provides higher sensitivity to smaller discontinuities in thick concrete structures, submerged in water, for PE mode [21].…”

Development and study of ultrasonic immersion testing system for industrial and metrological application

“…Ultrasonic immersion C-scan system provides a planar colour images of the object containing the information about defects and flaws. The C-scan images obtained from immersion scanning not only reveal the internal condition of the materials, but it can also reveal the type and location of flaws present in the sample and its operation is commonly based on pulse echo technique [12][13][14][15][16][17][18]. In this technique, the ultrasonic transducer is excited using the pulser/receiver, and signal is transmitted and received by the same transducer.…”