Studying the inspection limits in detecting buried objects by using infrared thermography

Kamoi, Arao; Okamoto, Yoshizo; Вавилов, В. П.

doi:10.1117/12.487450

Cited by 2 publications

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“…The MRTD determined by 4 bars target made of mortar showed 0.1~0.5 ˚C corresponding to the bar width from 2 to 4 mm. This result implies that the detection limits are agreeable for the results in this study [5]. (2) In short time heating tests by applying the heat flux of 3600 W/m 2 , produced by standard electrical bulbs, the effectiveness of detection was about five times better than in the case of long time heating.…”

Section: Recordingsupporting

confidence: 83%

Study on Detection Limit of Buried Defects in Concrete Structures by Using Infrared Thermography

Kamoi

Okamoto²,

Вавилов³

2004

KEM

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In Japan it happens that concrete parts suddenly collapse to create obstacles to the traffic in tunnels, on highways and bridges. Thus, the safety issue has become a serious social problem. Therefore, the detection of hidden defects in concrete building constructions in order to prevent an accidental damage is the important application area for nondestructive testing (NDT) techniques. Until now, the inspection is typically performed by using a hammer that is subjective and takes too much time. Infrared thermography is a promising NDT technique that might help in the fast detection of invisible (hidden) defects. Transient, or active, thermal NDT requires external thermal stimulation of the objects under test by warming up or cooling down the object surface. However, low-power and long heating is significantly affected by environmental conditions. Recent Japanese research in this area has been rather qualitative, i.e. without putting the accent on evaluating parameters of hidden defects. In this study, the experimental results are modeled and processed by using the thermal NDT software package developed at the Tomsk Institute of Introscopy. This has allowed not only optimizing test parameters but also obtaining reasonable estimates of defect parameters for air-filled voids and inclusions in concrete. It is shown that MRTD values measured by ourselves for the first time are of a little help while evaluating detection limit.

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Section: Recordingsupporting

confidence: 83%

Study on Detection Limit of Buried Defects in Concrete Structures by Using Infrared Thermography

Kamoi

Okamoto²,

Вавилов³

2004

KEM

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“…However, the growing use of surface mount technology and Multi-PCB integrated electronics keep solder joints hidden from view. Infrared thermography based nondestructive methodologies have been successfully used to characterize not only hidden defects sizes, but also their depth by means of the thermal behaviour of the surface of several materials [4][5][6][7]. On the other hand, numerical tools are already used to virtual-prototype electronics; the advantages of numerical methods are: no destructive testing is necessary saving money in the design phase, and parametric numerical analysis can help to improve electronics design by investigating the influences of several variables in the electronics behaviour [8,9].…”

Section: Introductionmentioning

confidence: 99%

Modelling and predicting hidden solder joint shape using active thermography and parametric numerical analysis

Palomares

Hsieh

2014

SPIE Proceedings

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A methodology based on active infrared thermography to study and characterize hidden solder joint shapes on a multi cover PCB assembly was investigated. A numerical model was developed to simulate the active thermography methodology and was proven to determine the grand average cooling rates with maximum errors of 8.85% (one cover) and 13.36% (two covers). A parametric analysis was performed by varying the number of covers, heat flux provided, and the amount of heating time. Grand average cooling rate distances among contiguous solder joint shapes, as well as solder joints discriminability, were determined to be directly proportional to heat flux, and inversely proportional to the number of covers and heating time. Finally, a mathematical model was developed to determine the appropriate total amount of energy needed to discriminate among hidden solder joints with a "good" discriminability for one and two covers, and a "regular" discriminability for up to five covers. The mathematical model was proven to predict the total amount of energy to achieve a "good" discriminability for one cover within a 10% of error with respect to the experimental active thermography model.

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Studying the inspection limits in detecting buried objects by using infrared thermography

Cited by 2 publications

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Study on Detection Limit of Buried Defects in Concrete Structures by Using Infrared Thermography

Study on Detection Limit of Buried Defects in Concrete Structures by Using Infrared Thermography

Modelling and predicting hidden solder joint shape using active thermography and parametric numerical analysis

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