Articles

AC Drives Provide Precise Control Critical to Next-Generation Test Stands

Direct Torque Control (DTC) is widely used as a method for controlling AC motors in many demanding applications. It is a unique method for controlling AC motors. In pulse-width modulation (PWM) drives, the output frequency and voltage are the primary control reference signals for the power switches, rather than the desired torque in/of the motor shaft. For those who are not familiar with inverter technology, the DTC principle can be illustrated most accurately via this mechanical analogy: the continuous calculation of the best angle at which to rotate a shaft, with a given arm length and the forces available. These electrical “force vectors” are generated with the help of semiconductor switches called Integrated Gate Bipolar Transistors (IGBT).

Posted in: Features, Motion Control, Articles

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Distributed Intelligence Drives High-Energy Laser Manufacturing

Historically, high-energy (Joule-class) nanosecond YAG lasers have been confined primarily to laboratory research facilities and government labs. System designs were unique for each facility and the low number of systems worldwide made the learning curve for system improvement slow. It is only in recent years that the maturity of the technology has reached a state that makes it possible to consider these lasers for industrial applications.

Posted in: Features, ptb catchall, Photonics, Articles

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DFM Your Device? Simulation Is the Answer

Design for Manufacturing (DFM) has taken off like a rocket in the electronics industry in recent years. Performing process and device simulations on CMOS transistors in a DFM flow have proven to be important in shortening the design cycle and reducing the production cost by improving yield. These are the key elements to why DFM mans the gate to the success of semiconductor foundries and companies.

Posted in: Features, ptb catchall, Photonics, Articles

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HBLEDs: Tackle Your Silicone Packaging Problems

It is widely known that the light emitting diode (LED) R&D and commercialization community is striving to produce higher power, bright-white-light LEDs. From both a temperature and UV-resistance standpoint, silicone is rapidly becoming the material of choice for the next-generation chip encapsulant. But as LED manufacturers look to employ silicones in their manufacturing processes, they must be aware of potential problems. Cure inhibition can lead to unacceptable variations in the manufacturing process and thus, the finished product. This article takes a brief look at the benefits of using silicones in high-brightness LED (HBLED) applications, with a focus on potential production floor issues and their solutions.

Posted in: Features, ptb catchall, Photonics, Articles

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Adaptive Algorithms, Multi-Cores, and Networks Mark New Machine Vision Era

Potato chips, cell phones, razors, and baby diapers are just a few of the many everyday items made with the help of industrial machine vision. In fact, any product that is manufactured in either high volume, high accuracy, low cost, or a combination of all three can be made better, faster, and less expensively using machine vision.

Posted in: Machine Vision, Articles

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Infrared Vision: SWIR Sees the Furnace Through the Flames

The ability to make thermal measurements and image through materials that confound more expensive thermal cameras is pushing shortwave infrared (SWIR) sensors into a growing number of industrial process monitoring and thermography applications, typically those of 100 °C or more.

Posted in: Imaging, Articles

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Medical Imaging: Multimodal Techniques Find Life’s Answers

Traditional research on disease mechanisms in animal models mainly has relied either on the detection of morphological changes of the diseased tissues obtained through anatomical imaging, or on the excision and pathological study of the tissues of interest. These methods often require long time periods for measurable changes to occur and large numbers of test animals because multiple animals are often sacrificed at each experimental point for histological testing.

Posted in: Imaging, Articles

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