Harmonic Frequency Components Detection by a Guide Wave type Electromagnetic Acoustic Transducers [EMATs]
نویسندگان
چکیده
منابع مشابه
Optimization of Electromagnetic Acoustic Transducers (EMATs) for Condition Assessment of Civil Infrastructure
There are more than 130,000 prestressed concrete bridges in the United States with about 37,000 bridges being more than 30 years old. Prestressing steel strands are an important construction element used in these bridges and are critical to their performance. Presently there is no effective Nondestructive Evaluation (NDE) technology for condition assessment of these prestressing strands once th...
متن کاملApplication of Pulse Compression Signal Processing Techniques to Electromagnetic Acoustic Transducers (emats) for Non-contact Thickness Measurements and Imaging
A pair of non-contact EMATs has been used for thickness measurements and imaging of metallic plates. This was performed using wide bandwidth EMATs and pulsecompression signal processing techniques, using chirp excitation. This gives a greatly improved Signal to Noise Ratio (SNR) for non-contact experiments, increasing the speed of data acquisition. A numerical simulation of the technique has co...
متن کاملElectromagnetic Acoustic Transducers for Robotic Nondestructive Inspection in Harsh Environments
Elevated temperature, gamma radiation, and geometric constraints inside dry storage casks for spent nuclear fuel represent a harsh environment for nondestructive inspection of the cask and require that the inspection be conducted with a robotic system. Electromagnetic acoustic transducers (EMATs) using non-contact ultrasonic transduction based on the Lorentz force to excite/receive ultrasonic w...
متن کاملEnhancement of signal amplitude of surface wave EMATs based on 3-D simulation analysis and orthogonal test method
The amplitude of an ultrasonic signal generated by electromagnetic acoustic transducers (EMATs) is typically low when compared to those generated by contacting transducers, which restricts the application of EMATs in the fields of nondestructive testing and nondestructive evaluation. The transmission process of a surface wave EMAT is studied, based on a previously established 3-D model, with th...
متن کاملOptimization of a Focusable and Rotatable Shear-Wave Periodic Permanent Magnet Electromagnetic Acoustic Transducers for Plates Inspection
Due to the symmetry of conventional periodic-permanent-magnet electromagnetic acoustic transducers (PPM EMATs), two shear (SH) waves can be generated and propagated simultaneously in opposite directions, which makes the signal recognition and interpretation complicatedly. Thus, this work presents a new SH wave PPM EMAT design, rotating the parallel line sources to realize the wave beam focusing...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Journal of Solid Mechanics and Materials Engineering
سال: 2008
ISSN: 1880-9871
DOI: 10.1299/jmmp.2.437