Long Single Driver 

LSDLong Single Driver is a transmit-receive pattern used in eddy current testing. This pattern involves one transmit coil (ie a single driver) providing the illuminating electromagnetic field, with the receiver coils positioned far away (ie long) relative to the eddy current skin depth and receiver coil separation distances.

The large distance between the transmit coil and the receiver coils enables better detection/evaluation performance for large defects and subsurface defects. It also enables a higher tolerance to lift-off variations than other array configurations.

For more information on LSD see:

WHAT THE HEC?! articles are not intended to be the definitive account on the topic or acronym in question. Readers’ comments and contributions are welcomed. Email: