APPARATUS FOR MEASURING CRYSTAL GRAIN SIZE OF STEEL SHEET

An apparatus for measuring a crystal grain size of a steel plate according to an embodiment of the present invention may comprises: an ultrasound generating unit for applying ultrasound to one point of a steel sheet; an ultrasound receiving unit for receiving propagated ultrasound at two points spac...

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Bibliographische Detailangaben
Hauptverfasser:	LEE, Sang-Jin, HUH, Hyeong-Jun, LIM, Choong-Soo
Format:	Patent
Sprache:	eng
Schlagworte:	INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES MEASURING MEASURING ANGLES MEASURING AREAS MEASURING IRREGULARITIES OF SURFACES OR CONTOURS MEASURING LENGTH, THICKNESS OR SIMILAR LINEARDIMENSIONS PHYSICS TESTING
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Beschreibung
Zusammenfassung:	An apparatus for measuring a crystal grain size of a steel plate according to an embodiment of the present invention may comprises: an ultrasound generating unit for applying ultrasound to one point of a steel sheet; an ultrasound receiving unit for receiving propagated ultrasound at two points spaced different distances apart from the one point of the steel sheet; and a crystal grain size calculating unit for calculating an average crystal grain size of the steel sheet according to intensities of the ultrasound propagated to the two points and an attenuation coefficient according to a distance between the two points. The apparatus can calculate an attenuation coefficient, regardless of a change of surface characteristics, such as surface reflectance, surface roughness, or the like.