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This paper describes the design, fabrication, characterization and test of three sectorized array transducers: one for air-coupled operation (400 kHz, 25 mm diameter) and two for water-coupled operation (4 MHz, 10 mm diameter and 2 MHz, 5 mm diameter). The objective is to use these transducers in pulse-echo mode along with a conical reflector to generate a 2D cylindrical acoustic field with angular...
Inspection of large or small pipes is commonly found in many different ultrasonic industrial applications. Pigs are commonly used for large pipes and inspection under working conditions. Small pipes are inspected from inside by using endoscopes, but the distance to be inspected can be limited by the pipe diameter, geometry and section variations. In medical applications, ultrasonic endoscopy are used...
This paper investigates the possibility of using ferroelectret films to produce wideband ultrasonic transducers for applications in water immersion and medical imaging. Ultrasonic transducers with different sizes (apertures) were fabricated using a polypropylene ferroelectret film (0.6 MHz thickness resonant frequency) as active component. Then, they were characterized in pulse-echo operation mode...
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