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In this paper, each parameter affecting the performance of spherical ultrasonic transducer is simulated by a reasonable finite element model (FEM), and optimal design parameters are obtained for a 50MHz spherical ultrasonic transducer. Simulation results show that the ceramic thickness of spherical ultrasonic transducer is calculated to be 40.9um and the center frequency is 50MHz; The radius for spherical...
A cylindrical transducer based on PZT-5H/epoxy 2–2 piezoelectric composite with 40 elements is designed and fabricated in this paper. The prepared PZT-5H/epoxy 2–2 piezoelectric composite shows a single thickness mode, low acoustical impedance (25.8MRayls) and high electromechanical coupling coefficient (0.72). A pulse-echo method is utilized to test the performance of the cylindrical transducer....
Ultrasonic transducer arrays are extensively used for the nondestructive evaluation of materials for aerospace and other applications. However, their use with composites requires some technique development because of reflections at the layer boundaries and the effects of attenuation. When used in full matrix capture mode, algorithms such as the total focusing method (TFM) must be applied to obtain...
A study has been undertaken of ultrasonic communications methods in air, using a quadrature modulation method. Simulations were first performed to establish the likely performance of quadrature phase shift keying over the limited bandwidth available in an ultrasonic system. Quadrature phase shift keying modulation was then implemented within an experimental communication system, using capacitive ultrasonic...
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