New method for non destructive snap-back characterization in multi-finger power MOSFETs

2008 ◽  
Author(s):  
Francois Dieudonne ◽  
Aurore Constant ◽  
Julien Rosa ◽  
Benoit Gautheron ◽  
Jean-Francois Revel
Keyword(s):  
New Method ◽  
Power Mosfets ◽  
Non Destructive

SAMPLING SYSTEMS FOR THE BIRCH CASEBEARER (LEPIDOPTERA: COLEOPHORIDAE)

1979 ◽  
Vol 111 (8) ◽  
pp. 875-882
Author(s):  
A. G. Raske ◽  
M. Alvo
Keyword(s):  
Maximum Likelihood ◽  
Sampling Plan ◽  
New Method ◽  
Betula Papyrifera ◽  
White Birch ◽  
Destructive Sampling ◽  
Damage Level ◽  
Sampling Systems ◽  
Non Destructive ◽  
Maximum Likelihood Technique

AbstractSample sizes needed to measure population levels of the birch casebearer, Coleophora fuscedinella Zeller, and its damage to white birch, Betula papyrifera Marsh, were calculated for various degrees of confidence and assurance. Both a non-destructive and a destructive sampling plan are presented and a new method to classify the damage level of a stand. This method uses a maximum likelihood technique to estimate the proportion of trees of various damage classes.

Failure analysis of epoxy molded IC packages

2016 ◽  
Vol 33 (2) ◽  
pp. 94-101
Author(s):  
Kamil Janeczek ◽  
Aneta Arazna ◽  
Konrad Futera ◽  
Grazyna Koziol
Keyword(s):  
Failure Analysis ◽  
Sulphuric Acid ◽  
Electronic Devices ◽  
Mechanical Grinding ◽  
Content Type ◽  
Power Mosfets ◽  
X Ray ◽  
Non Destructive ◽  
Practical Implications ◽  
Graphic Software

Purpose The aim of this paper is to present non-destructive and destructive methods of failure analysis of epoxy moulded IC packages on the example of power MOSFETs in SOT-227 package. Design/methodology/approach A power MOSFET in SOT-227 package was examined twice using X-ray inspection, at first as the whole component to check if it is damaged and then after removing the upper part of package by mechanical grinding. The purpose of the second X-ray inspection was to prepare images for estimation of the total number and approximate location of voids in soft solder layers. Finally, power MOSFETs were subjected to decapsulation process using a concentrated sulphuric acid to verify existence of damage areas noticed during X-ray analysis and to observe other possible failures such as cracks in aluminium metallization or wires deformation. Findings X-ray analysis was revealed to be adequate technique to detect damage (e.g. meltings) in power MOSFETs in SOT-227 package, but only when tested components were analysed in the side view. This type of analysis combined with a graphic software is also suitable for voids estimation in soft solder layers. Moreover, it was found that a single acid (concentrated sulphuric acid) at elevated temperature can be successfully used for decapsulation of power MOSFETs in SOT-227 package without damage of aluminium metallization and aluminium wires. Such decapsulation process enables analysis of defects in wire, die and package materials. Research limitations/implications Further investigations are required to examine if the presented methods of failures analysis can be used for other types of components (e.g. high power resistors) in similar packages. Practical/implications The described methods of failure analysis can find application in electronic industry to select components which are free of damage and in effect which allow to produce high reliable devices. Apart from it, the presented method is applicable to evaluate reasons of improper work of tested electronic devices and to identify faked components. Originality/value This paper contains valuable information for research and technical staff involved in the assessment of electronic devices who needs practical methods of failure analysis of epoxy moulded IC packages.

scholarly journals Orientation Identification of the Black Phosphorus with Different Thickness Based on B2g Mode Using a Micro-Raman Spectroscope under a Nonanalyzer Configuration

Materials ◽  
2020 ◽  
Vol 13 (23) ◽  
pp. 5572
Author(s):  
Rubing Li ◽  
Yongchao Shang ◽  
Huadan Xing ◽  
Xiaojie Wang ◽  
Mingyuan Sun ◽  
...  
Keyword(s):  
Theoretical Model ◽  
Research Field ◽  
Black Phosphorus ◽  
New Method ◽  
Important Condition ◽  
Crystalline Orientation ◽  
Parallel Polarization ◽  
Good Consistency ◽  
Non Destructive ◽  
Different Thickness

As an anisotropic material, the unique optoelectronic properties of black phosphorus are obviously anisotropic. Therefore, non-destructive and fast identification of its crystalline orientation is an important condition for its application in optoelectronics research field. Identifying the crystalline orientation of black phosphorus through Ag1 and Ag2 modes under the parallel polarization has high requirements on the Raman system, while in the nonanalyzer configuration, the crystalline orientation of the thick black phosphorus may not be identified through Ag1 and Ag2 modes. This work proposes a new method to identify the crystalline orientation of black phosphorus of different thicknesses. This method is conducted under the nonanalyzer configuration by B2g mode. The results show that B2g mode has a good consistency in the identification of crystalline orientations. In this paper, a theoretical model is established to study the angle-resolved Raman results of B2g mode. The new method can accurately identify the crystalline orientation with different layers of black phosphorus without misidentification.

Quantitative, zerstörungsfreie Feuchtemessung in Baustoffen vor Ort mit der Time Domain Reflectometry / Quantitative, non-destructive moisture measurement in building materials on site by time-domain re ectometry

1999 ◽  
Vol 5 (6) ◽  
pp. 609-618
Author(s):  
M. Stacheder ◽  
G. Grassegger ◽  
F. Grüner
Keyword(s):  
Time Domain ◽  
Building Materials ◽  
Salt Content ◽  
Time Domain Reflectometry ◽  
New Method ◽  
Measuring Methods ◽  
Surface Moisture ◽  
Non Destructive ◽  
Floor Cover

Abstract A new commercially available dielectric technique for the non-destructive determination of moisture in building materials based on the principle of 'time-domain reflectometry' (TDR) is presented. TDR measurements on samples of sandstone, brick, concrete and floor cover matched very well with results of conventional moisture measuring methods such as oven-drying or calciumcarbide-technique. The new method showed only a low influence of salt content or surface moisture of the material on the results.

scholarly journals Quantitative analysis of New Zealand-Antarctica plate motions during the Paleogene and Late Cretaceous

2021 ◽  
Author(s):  
◽  
Amandine Chambord
Keyword(s):  
Magnetic Anomaly ◽  
New Method ◽  
Magnetic Data ◽  
Magnetic Reversal ◽  
Tectonic Plates ◽  
Southwest Pacific ◽  
Single Plate ◽  
The Pacific ◽  
Non Destructive ◽  
Different Sources

<p>Quantifying past motions of tectonic plates in the southwest Pacific is important because the Pacific-Antarctic ridge is the only non-destructive boundary between the Pacific plate and other major plates. However, formation of sea-ice near Antarctica impairs the collection of magnetic anomaly data that are necessary to calculate plate rotations. A detailed analysis of all ship-track magnetic data available in the southwest Pacific (61 cruises, 153 profiles, including several cruises collected after 1995) is presented here. Four different sources of uncertainty are quantified: (1) confidence of magnetic anomaly identification, (2) magnetic reversal location picking precision, (3) ship navigation precision, and (4) magnetic data quality. Finite plate rotations are calculated for the southwest Pacific (42.5 to 79 Ma) using the resulting magnetic anomaly database (1528 magnetic reversal data). Finite rotations were calculated using the Hellinger criterion, or by a new method presented here that assumes orthogonality between fracture zones and ridge segments. The new method requires less parameters and is hence able better estimate rotations in cases with an uneven distribution of sparse magnetic data. Rotations and formal uncertainties are calculated for thirty-one chrons (c20y to c33o). They confirm the existence of a three plate system (Pacific, Marie Byrd Land, Bellingshausen) in the southwest Pacific from before c31o (68.7 Ma) until c28y (62.5 Ma). After c28y, the Bellingshausen and Marie Byrd Land plates moved as a single plate.</p>

scholarly journals Development of New Method of Non-destructive Testing of Electrical Cables

2018 ◽  
pp. 4-10 ◽  
Author(s):  
Ivan V. Bryakin ◽  
◽  
Igor V. Bochkarev ◽  
Vadim R. Khramshin ◽  
◽  
...  
Keyword(s):  
New Method ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Electrical Cables ◽  
Non Destructive

Developed non-destructive verification methods for accelerated temperature cycling of power MOSFETs

2022 ◽  
Vol 128 ◽  
pp. 114442
Author(s):  
You-Cheol Jang ◽  
Hyo Eun Kim ◽  
Ariadna Schuck ◽  
Yong-Sang Kim
Keyword(s):  
Temperature Cycling ◽  
Power Mosfets ◽  
Verification Methods ◽  
Non Destructive

scholarly journals A novel optical coherence tomography-based micro-indentation technique for mechanical characterization of hydrogels

2007 ◽  
Vol 4 (17) ◽  
pp. 1169-1173 ◽  
Author(s):  
Ying Yang ◽  
Pierre O Bagnaninchi ◽  
Mark Ahearne ◽  
Ruikang K Wang ◽  
Kuo-Kang Liu
Keyword(s):  
Mechanical Properties ◽  
Optical Coherence Tomography ◽  
Soft Materials ◽  
New Method ◽  
Optical Coherence ◽  
Depth Sensing ◽  
Young’S Moduli ◽  
Unique Character ◽  
Non Destructive ◽  
Micro Indentation

Depth-sensing micro-indentation has been well recognized as a powerful tool for characterizing mechanical properties of solid materials due to its non-destructive approach. Based on the depth-sensing principle, we have developed a new indentation method combined with a high-resolution imaging technique, optical coherence tomography, which can accurately measure the deformation of hydrogels under a spherical indenter at constant force. The Hertz contact theory has been applied for quantitatively correlating the indentation force and the deformation with the mechanical properties of the materials. Young's moduli of hydrogels estimated by the new method are comparable with those measured by conventional depth-sensing micro-indentation. The advantages of this new method include its capability to characterize mechanical properties of bulk soft materials and amenability to perform creeping tests. More importantly, the measurement can be performed under sterile conditions allowing non-destructive, in situ and real-time investigations on the changes in mechanical properties of soft materials (e.g. hydrogel). This unique character can be applied for various biomechanical investigations such as monitoring reconstruction of engineered tissues.

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