Table 2.

Transducer categories concerning spectrum response.

S/N	Transducer Series	Remarks of Merit
1	High resolution (HR) Series	Heavily damped Most broadband Effective for structure thickness gaging
2	General purpose(GP) Series	Less damped Bandwidth is between the narrow banded and broadband series Effective in detecting the majority of a structural flaw
3	High gain (HG) series	Less damped and tuned Most narrow banded Effective in detecting flaw on highly attenuated, rough surface or relatively thick materials.