Abstract
The weak coupling efficiency with EMATs is sufficiently compensated for by the combination with resonance methods. This is called electromagnetic acoustic resonance, or EMAR. Tone burst input signals are normally used for this purpose, and an analog superheterodyne spectrometer is useful for detecting resonance frequencies. This chapter describes the principle and operation of EMAR measurement and shows electric circuit for the analog spectral analysis.
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Hirao, M., Ogi, H. (2017). Principles of EMAR for Spectral Response. In: Electromagnetic Acoustic Transducers. Springer Series in Measurement Science and Technology. Springer, Tokyo. https://doi.org/10.1007/978-4-431-56036-4_5
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DOI: https://doi.org/10.1007/978-4-431-56036-4_5
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