Special Coverage


Fundamentals of Vector Network Analysis Primer

One of the most common measuring tasks in RF engineering involves analysis of circuits (networks). A network analyzer is an instrument that is designed to handle this job with great precision and efficiency. Circuits that can be analyzed using network analyzers range from simple devices such as filters and amplifiers to complex modules used in communications satellites.

Posted in: Test & Measurement, White Papers


Engineers Build 3D Acoustic Cloaking Device

Using little more than a few perforated sheets of plastic and a staggering amount of number crunching, Duke engineers have demonstrated a three-dimensional acoustic cloak. The new device reroutes sound waves to create the impression that both the cloak and anything beneath it are not there.The acoustic cloaking device works in all three dimensions, no matter which direction the sound is coming from or where the observer is located, and holds potential for future applications such as sonar avoidance and architectural acoustics.The materials manipulating the behavior of sound waves are simply plastic and air. Once constructed, the device looks like several plastic plates with a repeating pattern of holes poked through them. The plates are stacked on top of one another to form a sort of pyramid.The cloak must alter the waves’ trajectory to match what they would look like had they had reflected off a flat surface. Because the sound is not reaching the surface beneath, it is traveling a shorter distance and its speed must be slowed to compensate.To test the cloaking device, researchers covered a small sphere with the cloak and “pinged” it with short bursts of sound from various angles. Using a microphone, they mapped how the waves responded and produced videos of them traveling through the air.SourceLearn about an Acoustic Liner for Turbomachinery Applications.

Posted in: News


Coming Soon - Innovative Antimicrobial Resistant Polymers for Medical Devices

Secondary infections found in hospital environments are becoming an increasingly significant concern for patients, hospital administrators, and staff. Patient care can be negatively affected when a secondary infection caused by a variety of microorganisms commonly found in healthcare environments leads to health issues for a patient. With insurance companies no longer covering the expense for secondary infections, the cost to hospitals for the infections can lead to a negative return on their bottom line.

Posted in: Upcoming Webinars, Webinars, MDB


Arm Control for World's Largest Functional Brain Model

Spaun, the world's largest functional model of the human brain, has a digital eye, which it uses for visual input, and a robotic arm that it uses to draw its responses. Having a realistic arm that behaves similarly to an actual arm, with appropriate muscle responses and arm segment lengths and mass, is important to getting human-like results.

Posted in: On-Demand Webinars


Coming Soon - Next Generation Non-Destructive Material Analysis - How Handheld FTIR Spectroscopy is Changing Damage and Contamination Analysis, Coating Evaluation, and Material Identification

Handheld FTIR spectroscopy provides a range of new capabilities for non-destructive testing of composites, coatings and polymers. This technique allows the user to take the instrument directly to the object requiring analysis, regardless of its location or size—eliminating the need to transport an object or sample to a traditional lab. Measurements can be made in situ and in real-time, enabling greater flexibility in understanding what and where to measure. It also means that it is not necessary to excise a sample from the object, making handheld FTIR a truly non-destructive testing solution.

Posted in: Upcoming Webinars


Water Impact Simulation Ensures Safer Landing for NASA Astronauts

The water landing of a craft like the Orion Crew Module is a very complex and changeable event, subject to the dynamics of the vehicle’s structure and sub-structures, such as its heat shield and atmospheric and water conditions. To maintain the spacecraft’s structural integrity and increase safety of the crew, a clearer understanding of the dynamic loads generated during water impact was required.

Posted in: Application Briefs


Programmable Metamaterial Damps Vibrations

Researchers from Empa and ETH Zurich have produced a material prototype that damps vibrations completely and specifically conducts certain frequencies.  The working model consists of a one-meter by one-centimeter aluminum plate that is one millimeter thick. The sheet-metal strip vibrates at different frequencies. In order to control the wave propagation, ten small aluminum cylinders (7 mm thick, 1 cm high) are attached to the metal. Between the sheet and the cylinders sit piezo discs, which can be stimulated electronically and change their thickness quickly. The model enables the researchers to control how waves are allowed to propagate in the sheet-metal strip. Such a “metamaterial” could fundamentally revolutionize mechanical engineering and plant construction. In the future, the material could react to current vibration readings and adapt its vibration properties at lightning speed. SourceAlso: See other Materials tech briefs.

Posted in: News