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TEM Transmit EMAT Matching Network

The TEM consists of eight high-voltage capacitors, which may be switched in parallel with the electromagnetic acoustic transducer (EMAT) coil. This raises the typically low inductive impedance of the EMAT to a point where it can be more efficiently driven by a gated amplifier. This type of matching can improve the performance of many EMATs, especially if the EMAT has a significant inductive reactance. In many cases, however, more sophisticated matching circuits may be needed. (See Application Notes.)