APPARATUS FOR MEASURING CRYSTAL GRAIN SIZE OF STEEL SHEET
The present invention relates to an apparatus for measuring a crystal grain size of a steel sheet by using an attenuation coefficient of a Rayleigh wave that can guarantee a sufficiently long ultrasound wave propagation distance even in a thin sheet. An apparatus for measuring a crystal grain size o...
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| creator | LEE, Sang-Jin HUH, Hyeong-Jun LIM, Choong-Soo |
| description | The present invention relates to an apparatus for measuring a crystal grain size of a steel sheet by using an attenuation coefficient of a Rayleigh wave that can guarantee a sufficiently long ultrasound wave propagation distance even in a thin 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 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. |
| format | Patent |
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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. 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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.</description><subject>INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES</subject><subject>MEASURING</subject><subject>MEASURING ANGLES</subject><subject>MEASURING AREAS</subject><subject>MEASURING IRREGULARITIES OF SURFACES OR CONTOURS</subject><subject>MEASURING LENGTH, THICKNESS OR SIMILAR LINEARDIMENSIONS</subject><subject>PHYSICS</subject><subject>TESTING</subject><fulltext>true</fulltext><rsrctype>patent</rsrctype><creationdate>2019</creationdate><recordtype>patent</recordtype><sourceid>EVB</sourceid><recordid>eNrjZLB0DAhwDHIMCQ1WcPMPUvB1dQwODfL0c1dwDooMDnH0UXAPcvT0Uwj2jHJV8HdTCA5xdfVRCPZwdQ3hYWBNS8wpTuWF0twMCm6uIc4euqkF-fGpxQWJyal5qSXxrgHGpmaGJiaWjibGRCgBAEVAKGo</recordid><startdate>20191127</startdate><enddate>20191127</enddate><creator>LEE, Sang-Jin</creator><creator>HUH, Hyeong-Jun</creator><creator>LIM, Choong-Soo</creator><scope>EVB</scope></search><sort><creationdate>20191127</creationdate><title>APPARATUS FOR MEASURING CRYSTAL GRAIN SIZE OF STEEL SHEET</title><author>LEE, Sang-Jin ; HUH, Hyeong-Jun ; LIM, Choong-Soo</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-epo_espacenet_EP3561449A43</frbrgroupid><rsrctype>patents</rsrctype><prefilter>patents</prefilter><language>eng ; fre ; ger</language><creationdate>2019</creationdate><topic>INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES</topic><topic>MEASURING</topic><topic>MEASURING ANGLES</topic><topic>MEASURING AREAS</topic><topic>MEASURING IRREGULARITIES OF SURFACES OR CONTOURS</topic><topic>MEASURING LENGTH, THICKNESS OR SIMILAR LINEARDIMENSIONS</topic><topic>PHYSICS</topic><topic>TESTING</topic><toplevel>online_resources</toplevel><creatorcontrib>LEE, Sang-Jin</creatorcontrib><creatorcontrib>HUH, Hyeong-Jun</creatorcontrib><creatorcontrib>LIM, Choong-Soo</creatorcontrib><collection>esp@cenet</collection></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext_linktorsrc</fulltext></delivery><addata><au>LEE, Sang-Jin</au><au>HUH, Hyeong-Jun</au><au>LIM, Choong-Soo</au><format>patent</format><genre>patent</genre><ristype>GEN</ristype><title>APPARATUS FOR MEASURING CRYSTAL GRAIN SIZE OF STEEL SHEET</title><date>2019-11-27</date><risdate>2019</risdate><abstract>The present invention relates to an apparatus for measuring a crystal grain size of a steel sheet by using an attenuation coefficient of a Rayleigh wave that can guarantee a sufficiently long ultrasound wave propagation distance even in a thin 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 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.</abstract><oa>free_for_read</oa></addata></record> |
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| subjects | 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 |
| title | APPARATUS FOR MEASURING CRYSTAL GRAIN SIZE OF STEEL SHEET |
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