Heavy-Wire Bond Manipulation with Laser to Increase Reliability and as Enabler for Thermography based On-line Process Control

2014 ◽  
Vol 2014 (1) ◽  
pp. 000361-000366 ◽  
Author(s):  
Andreas Middendorf ◽  
Klaus Dieter Lang
Keyword(s):  
Research Work ◽  
Depth Of Cut ◽  
Failure Behavior ◽  
Manufacturing Method ◽  
Wire Bonds ◽  
On Line ◽  
Line Process ◽  
Black Coloring ◽  
Non Destructive ◽  
Bonding Surface

Investigations regarding the failure behavior of heavy wire bonds show a significant decrease of cycles in strength with increasing wire diameter. The article explains the reasons theoretically. Based on the theory, possibilities to increase reliability are discussed. The innovation about this is the shaping of a chute on the bonding surface. This has to happen in a way that the current ampacity is not reduced. A laser will therefore cut across the bonding surface crosswise to the course of the wire. Previously the particular depth of cut is determined by simulation. The simulations prove the theoretically predicted enhancement of the reliability true. In addition, the method can be used as "non-destructive" in-situ measurement for quality assurance, since the crack growth can be derived from the thermography directly in the notches. The notches work as a magnifier for the thermography camera and eliminate the black coloring as a precondition in typical thermography. The research work is carried out within the project RoBE partially which is funded by BmBF; the manufacturing method and the geometric shapes have been patented.

scholarly journals Condition Assessment of Low Voltage Photovoltaic DC Cables under Thermal Stress Using Non-Destructive Electrical Techniques

2020 ◽  
Vol 21 (5) ◽  
pp. 503-512
Author(s):  
Ehtasham Mustafa ◽  
Ramy S. A. Afia ◽  
Zoltán Ádám Tamus
Keyword(s):  
Thermal Stress ◽  
Condition Monitoring ◽  
Low Voltage ◽  
Research Work ◽  
Diagnostic Methods ◽  
Voltage Response ◽  
Insulation Material ◽  
On Line ◽  
Non Destructive ◽  
Line Condition

Abstract The output power of the photovoltaic system is heavily dependent on the low voltage (LV) DC cables which are exposed to multiple stresses such as climatic, mechanical, electrical, and thermal stress, hence makes them more exposed to aging as compared to other components in the system. Accordingly, it is essential to monitor the state and know the real cause of the insulation degradation of the cable. The physio-chemical changes inside the insulation during service is attributed to the thermal stress, which the cable has to endure constantly. Traditionally, destructive test techniques have been adopted to study the aging phenomenon in the cable insulation, making them unsuitable for on-line condition monitoring. This research work has been aimed to study the degradation in LV photovoltaic DC cables under thermal stress by measuring the dielectric properties; complex permittivity, tanδ with the change in frequency and decay and return voltage slopes using extended voltage response method. The non-destructive diagnostic methods used are based on the phenomenon of polarization and conduction in the insulation material. The noteworthy change in the values of the imaginary part of permittivity, tanδ at low frequencies, and the overall decrease in the values of return voltage slope showed the change in the structure of the polymer matrix under the stress which was related to the cross-linking based chemical reactions. The results show that the techniques can be adopted for the on-line condition monitoring of the cable for the PV system and the dielectric parameters can be used to study the chemical and physical changes happening inside the material effectively.

Laser cuts increase the reliability of heavy-wire bonds and enable on-line process control using thermography

2017 ◽  
Vol 76-77 ◽  
pp. 450-454
Author(s):  
A. Middendorf ◽  
A. Grams ◽  
S. Janzen ◽  
K.-D. Lang ◽  
O. Wittler
Keyword(s):  
Process Control ◽  
Wire Bonds ◽  
On Line ◽  
Line Process

scholarly journals Sensing Technology for Fish Freshness and Safety: A Review

Sensors ◽  
2021 ◽  
Vol 21 (4) ◽  
pp. 1373
Author(s):  
Leonardo Franceschelli ◽  
Annachiara Berardinelli ◽  
Sihem Dabbou ◽  
Luigi Ragni ◽  
Marco Tartagni
Keyword(s):  
Sample Preparation ◽  
Spectroscopic Methods ◽  
New Techniques ◽  
Non Invasive ◽  
Sensing Technology ◽  
Physical Attributes ◽  
On Line ◽  
Line Process ◽  
Non Destructive ◽  
No Sample Preparation

Standard analytical methods for fish freshness assessment are based on the measurement of chemical and physical attributes related to fish appearance, color, meat elasticity or texture, odor, and taste. These methods have plenty of disadvantages, such as being destructive, expensive, and time consuming. All these techniques require highly skilled operators. In the last decade, rapid advances in the development of novel techniques for evaluating food quality attributes have led to the development of non-invasive and non-destructive instrumental techniques, such as biosensors, e-sensors, and spectroscopic methods. The available scientific reports demonstrate that all these new techniques provide a great deal of information with only one test, making them suitable for on-line and/or at-line process control. Moreover, these techniques often require little or no sample preparation and allow sample destruction to be avoided.

On-Line Process Identification and Autotuning for Integrating Processes

1997 ◽  
Vol 36 (12) ◽  
pp. 5329-5338 ◽  
Author(s):  
Hee Jin Kwak ◽  
Su Whan Sung ◽  
In-Beum Lee
Keyword(s):  
Process Identification ◽  
On Line ◽  
Line Process

On-line process-model-based control of a plasma etcher

1992 ◽  
Author(s):  
Michael E. Parten ◽  
R. R. Rhinehart ◽  
Vikram Singh
Keyword(s):  
Process Model ◽  
Model Based Control ◽  
Model Based ◽  
On Line ◽  
Line Process
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