Hit/Miss POD With Model Assisted and Emulated Flaws

Tuomas Koskinen, Iikka Virkkunen

    Research output: Contribution to journalArticleScientificpeer-review

    Abstract

    The determination of the reliability of an inspection is of high significance. In particular, it is important to determine what is the largest crack, which could conceivably be missed during the in-service inspection. This information is utilized in order to choose the most effective method for different situations. Probability of detection (POD) curves are used to quantify the inspection effectiveness. However, major obstruction for POD curves is the requirement for a lot of data points in order to give reliable estimates of the lower limit performance, rendering reliable POD curves highly expensive to produce.
    In this study, POD curve is estimated using only few thermal fatigue cracks, which is insufficient to produce a POD curve alone. In the present study the idea is to emulate the amplitude response from the measured crack in a way that represents an amplitude response from a certain crack size and in addition CIVA simulation is used to produce amplitude response data from similar simulated cracks. Both amplitude responses are then in turn converted to a B-scan image for inspectors to evaluate whether there is a crack or not. Then a POD curve is generated from the achieved hit/miss data. The idea is to decrease the amount of needed real flaws and also to determine if an inspector can tell the difference between real, emulated and a simulated flaw.
    Original languageEnglish
    Number of pages8
    JournalThe e-Journal of Nondestructive Testing & Ultrasonics
    Volume23
    Issue number8
    Publication statusPublished - 1 Jun 2018
    MoE publication typeA1 Journal article-refereed
    Event12th European Conference on Non-Destructive Testing, ECNDT 2018 - Gothenburg, Sweden
    Duration: 11 Jun 201815 Jun 2018

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    Defects
    Cracks
    Inspection
    Thermal fatigue

    Cite this

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    title = "Hit/Miss POD With Model Assisted and Emulated Flaws",
    abstract = "The determination of the reliability of an inspection is of high significance. In particular, it is important to determine what is the largest crack, which could conceivably be missed during the in-service inspection. This information is utilized in order to choose the most effective method for different situations. Probability of detection (POD) curves are used to quantify the inspection effectiveness. However, major obstruction for POD curves is the requirement for a lot of data points in order to give reliable estimates of the lower limit performance, rendering reliable POD curves highly expensive to produce.In this study, POD curve is estimated using only few thermal fatigue cracks, which is insufficient to produce a POD curve alone. In the present study the idea is to emulate the amplitude response from the measured crack in a way that represents an amplitude response from a certain crack size and in addition CIVA simulation is used to produce amplitude response data from similar simulated cracks. Both amplitude responses are then in turn converted to a B-scan image for inspectors to evaluate whether there is a crack or not. Then a POD curve is generated from the achieved hit/miss data. The idea is to decrease the amount of needed real flaws and also to determine if an inspector can tell the difference between real, emulated and a simulated flaw.",
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    Hit/Miss POD With Model Assisted and Emulated Flaws. / Koskinen, Tuomas; Virkkunen, Iikka.

    In: The e-Journal of Nondestructive Testing & Ultrasonics, Vol. 23, No. 8, 01.06.2018.

    Research output: Contribution to journalArticleScientificpeer-review

    TY - JOUR

    T1 - Hit/Miss POD With Model Assisted and Emulated Flaws

    AU - Koskinen, Tuomas

    AU - Virkkunen, Iikka

    PY - 2018/6/1

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    N2 - The determination of the reliability of an inspection is of high significance. In particular, it is important to determine what is the largest crack, which could conceivably be missed during the in-service inspection. This information is utilized in order to choose the most effective method for different situations. Probability of detection (POD) curves are used to quantify the inspection effectiveness. However, major obstruction for POD curves is the requirement for a lot of data points in order to give reliable estimates of the lower limit performance, rendering reliable POD curves highly expensive to produce.In this study, POD curve is estimated using only few thermal fatigue cracks, which is insufficient to produce a POD curve alone. In the present study the idea is to emulate the amplitude response from the measured crack in a way that represents an amplitude response from a certain crack size and in addition CIVA simulation is used to produce amplitude response data from similar simulated cracks. Both amplitude responses are then in turn converted to a B-scan image for inspectors to evaluate whether there is a crack or not. Then a POD curve is generated from the achieved hit/miss data. The idea is to decrease the amount of needed real flaws and also to determine if an inspector can tell the difference between real, emulated and a simulated flaw.

    AB - The determination of the reliability of an inspection is of high significance. In particular, it is important to determine what is the largest crack, which could conceivably be missed during the in-service inspection. This information is utilized in order to choose the most effective method for different situations. Probability of detection (POD) curves are used to quantify the inspection effectiveness. However, major obstruction for POD curves is the requirement for a lot of data points in order to give reliable estimates of the lower limit performance, rendering reliable POD curves highly expensive to produce.In this study, POD curve is estimated using only few thermal fatigue cracks, which is insufficient to produce a POD curve alone. In the present study the idea is to emulate the amplitude response from the measured crack in a way that represents an amplitude response from a certain crack size and in addition CIVA simulation is used to produce amplitude response data from similar simulated cracks. Both amplitude responses are then in turn converted to a B-scan image for inspectors to evaluate whether there is a crack or not. Then a POD curve is generated from the achieved hit/miss data. The idea is to decrease the amount of needed real flaws and also to determine if an inspector can tell the difference between real, emulated and a simulated flaw.

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    JO - The e-Journal of Nondestructive Testing & Ultrasonics

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