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A Build-Up Tratment for Thickness Gauging of Steel PLates Based on Gamma-ray Transmission
https://repo.qst.go.jp/records/42895
https://repo.qst.go.jp/records/42895a2114381-4280-47a7-a085-5cb34fd7bd95
Item type | 学術雑誌論文 / Journal Article(1) | |||||
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公開日 | 2002-06-03 | |||||
タイトル | ||||||
タイトル | A Build-Up Tratment for Thickness Gauging of Steel PLates Based on Gamma-ray Transmission | |||||
言語 | ||||||
言語 | eng | |||||
資源タイプ | ||||||
資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
資源タイプ | journal article | |||||
アクセス権 | ||||||
アクセス権 | metadata only access | |||||
アクセス権URI | http://purl.org/coar/access_right/c_14cb | |||||
著者 |
Shirakawa, Yoshiyuki
× Shirakawa, Yoshiyuki× 白川 芳幸 |
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抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | Gamma-ray thickness gauges are widely used in manufacturing plants such as hot strip mills and heavy plate mills of the steel industry. They are the most suitable instruments to carry out precise thickness control of steel sheets or plates in rolling mills. Much effort is needed to maintain these gauges, to keep their measuring accuracy and to calibrate parameters of conventional models installed in the gauges. The maintenance work is in general laborious because ordinary gauges have more than ten linear measurement models and they require the same number of standard steel plates for calibration. In order to decrease this work, a non-linear thickness measurement method with a new build-up model has been proposed and evaluated by using a real gamma-ray thickness gauge. A conventional gamma-ray thickness gauge employs many linear measurement models given by eq. (1), I=I0exp(-μXi) (1) where I0 and I are the numbers of incident and transmitted gamma-rays respectively, μ(cm-1) is a linear attenuation coefficient of measured objects, in this case steel plates, and Xi (cm) is thickness in the i-th measuring range. The models deal with only a small measurement range each and the same number of standard steel plates is needed for model parameter calibration. The proposed model with a variable linear attenuation coefficient (cm-1) shown in eq. (2), I=I0exp(-μ(X)X), μ(X)=(μ0 /β)[exp(-αX)+(β-1)] (2) whereμ0 is the ideal linear attenuation coefficient obtained under the condition of X→0, αand β are positive constants given by previous experiments, includes build-up effects inμ(X) . The logarithmic expression of Eq. (2) is K/x = exp(-αx) + M, (3) where K=-β/μ0ln(I/I0) > 0 and M=β-1 >0. We consider two curves, which are y1 = K/x , y2 = exp(-αx) + M, (4) where y1 decreases from infinity to zero, and y2 fromβ toβ-1, monotonically as x increases. Hence, under these conditions, it is true that y1 and y2 intersect at only one point and the value x of the point is a solution of Eqs. (3) and (4). In practice, the intersection point is easily calculated with reasonable accuracy by the repetition method. |
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書誌情報 |
Applied Radiation and Isotopes 巻 53, p. 581-586, 発行日 2000-06 |
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ISSN | ||||||
収録物識別子タイプ | ISSN | |||||
収録物識別子 | 0969-8043 |