Ultrasonic Transducer Research Papers - Academia.edu (original) (raw)

This work focuses on an ultrasonic guided wave structural health monitoring (SHM) system development for aircraft wing inspection. In part I of the study, a detailed description of a real aluminum wing specimen and some preliminary wave... more

This work focuses on an ultrasonic guided wave structural health monitoring (SHM) system development for aircraft wing inspection. In part I of the study, a detailed description of a real aluminum wing specimen and some preliminary wave propagation tests on the wing panel are presented. Unfortunately, strong attenuation and scattering impede guided waves for large-area inspection. Nevertheless, small, low-cost and light-weight piezoelectric (PZT) discs were bonded to various parts of the aircraft wing, in a form of relatively sparse arrays, for simulated cracks and corrosion monitoring. The PZT discs take turns generating and receiving ultrasonic guided waves. Pair-wise through-transmission waveforms collected at normal conditions served as baselines, and subsequent signals collected at defected conditions such as rivet cracks or corrosion detected the presence of a defect and its location with a novel correlation analysis based technique called RAPID (reconstruction algorithm for probabilistic inspection of defects). The effectiveness of the algorithm was tested with several case studies in a laboratory environment. It showed good performance for defect detection, size estimation and localization in complex aircraft wing structures.

The objective of this system is to make fault detection system for industrial materials which are used to make machineries and tools. This system uses latest technology of Raspberry Pi and Arduino MCU. This system is based on low power... more

The objective of this system is to make fault detection system for industrial materials which are used to make machineries and tools. This system uses latest technology of Raspberry Pi and Arduino MCU. This system is based on low power and low cost as compared to present technology. It uses Ultrasonic transducer for testing object to find fault. Raspberry Pi and Arduino MCU are used as signal processing unit (SPU). Data acquisition and signal averaging will done in signal processing unit. It makes such a system which are useful to find fault in materials and tools and also has various types of features to make system reliable and protective.

Conventional wisdom stipulates that high power ultrasound without direct or indirect transducer contact with the medium to be treated is not possible. This seemingly correct notion is based upon two major hurdles: inefficient transmission... more

Conventional wisdom stipulates that high power ultrasound without direct or indirect transducer contact with the medium to be treated is not possible. This seemingly correct notion is based upon two major hurdles: inefficient transmission of ultrasound from the piezoelectric material into air/gases and exorbitant attenuation of ultrasound by gases. The latter is a natural phenomenon about which nothing can be done, and the former requires an un-conventional approach to transducer design. After many years of R& D in this area, we have finally succeeded in producing transducers that generate immense acoustic pressure in air in the frequency range of ∼50 kHz→10 MHz. By using these transducers without any contact with the material, we demonstrate destruction of 99.9% of dried bacterial spore samples of a close relative of anthrax, Bacillus thuringiensis. Following further refinement of the transducers and the mechanism of their excitation, we anticipate that non-contact ultrasound will have numerous applications including inactivation of agents of bioterrorism and sterilization of medical and surgical equipment, food materials, and air-duct systems of buildings, airplanes, space stations, and others.