Evaluation Engineering - 27
Figure 4: This image displays the Gate 1
and Gate 2 images of a different TO-247.
edge-as the leftmost in Figure 2 and is likewise well-bonded. But the red regions around
the two other wires reaching these leads show
that they're poorly bonded or not bonded at all.
The acoustic images in this article were made
with the commonly used C-mode imaging method. Over a dozen other acoustic imaging modes
can produce, for example, a non-destructive
cross-section; up to 100 or more thin gates at
progressive depths within the sample; a threedimensional acoustic image; a variably sectionable three-dimensional image; or any of several
other image types. Their value for TO-247s lies
in identifying fabrication errors and in preventing defective devices from going into service.
Tom Adams is a consultant at Nordson SONOSCAN
and Enes Ugur is a member of the Power Electronics
and Drives Lab at The University of Texas at Dallas.
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Evaluation Engineering
Table of Contents for the Digital Edition of Evaluation Engineering
Editor's Note: Combining Forces
By the Numbers
Industry Report
Electrical Safety Test: EST instruments provide safe environment to ensure compliance
RF/Microwave Switching: RF/microwave switching adds flexibility to diverse applications
RF/Microwave: Ground penetrating radar offers new sensor modalities for vehicles
Software: Software boosts power applications
Automated Test: Non-destructive analysis of TO-247 structural defects
Tech Focus
Featured Tech
Machine Vision: The blindfolds are coming off for robotics
Evaluation Engineering - 1
Evaluation Engineering - 2
Evaluation Engineering - 3
Evaluation Engineering - By the Numbers
Evaluation Engineering - 5
Evaluation Engineering - Industry Report
Evaluation Engineering - 7
Evaluation Engineering - Electrical Safety Test: EST instruments provide safe environment to ensure compliance
Evaluation Engineering - 9
Evaluation Engineering - 10
Evaluation Engineering - 11
Evaluation Engineering - 12
Evaluation Engineering - 13
Evaluation Engineering - RF/Microwave Switching: RF/microwave switching adds flexibility to diverse applications
Evaluation Engineering - 15
Evaluation Engineering - 16
Evaluation Engineering - 17
Evaluation Engineering - 18
Evaluation Engineering - 19
Evaluation Engineering - RF/Microwave: Ground penetrating radar offers new sensor modalities for vehicles
Evaluation Engineering - 21
Evaluation Engineering - Software: Software boosts power applications
Evaluation Engineering - 23
Evaluation Engineering - Automated Test: Non-destructive analysis of TO-247 structural defects
Evaluation Engineering - 25
Evaluation Engineering - 26
Evaluation Engineering - 27
Evaluation Engineering - Tech Focus
Evaluation Engineering - 29
Evaluation Engineering - Featured Tech
Evaluation Engineering - 31
Evaluation Engineering - 32
Evaluation Engineering - 33
Evaluation Engineering - Machine Vision: The blindfolds are coming off for robotics
Evaluation Engineering - 35
Evaluation Engineering - 36
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