A term used to define a surface coil that can rotate about a test specimen is called?

The term that defines a surface coil capable of rotating about a test specimen is the spinning coil. This design allows the coil to make multiple measurements around the circumference of the test object, which can be particularly useful for detecting discontinuities or variations in material properties. The rotation enhances the sensitivity of the inspection by enabling the coil to interact with the specimen from different angles, effectively providing a more comprehensive assessment of the surface conditions.

The concept of a spinning coil is crucial in applications where access to various facets of a component is necessary, enabling thorough inspections without the need for repositioning the specimen itself. This method is advantageous in non-destructive testing environments where time efficiency and accuracy are paramount.