Measuring the position of a shaft with both linear and rotary motion is a challenging design problem that usually involves two sensors, one for each axes of motion, and two input ports. Three engineers at MTS Sensors just received a patent (U.S. patent 6,600,310) for a sensor technology that does both, potentially saving engineers cost and complexity in their designs. The sensor is an extension of MTS' Temposonics non-contact position sensor technology, which exploits the capability of a magnetostrictive material to deform under the application of a magnetic field. The sensor works by inducing a sonic wave in a magnetostrictive waveguide through the interaction of a magnetic field from a ring-shaped permanent magnet that moves along the sensor tube and a current—or interrogation—pulse. By measuring the elapsed time for the resulting strain pulse to travel along the waveguide to a detector head, the magnet's absolute position can be determined with high accuracy. This sensor takes the concept a step further by employing a second permanent magnet that is helical in shape. In essence, this second magnet provides a reference position so that the amount of rotation of the linear magnet on the shaft can be determined. A first application for the technology is in automatic manual transmissions. Though that may sound like an oxymoron, automakers, in fact, have been looking at ways to take a standard transmission with clutch pedal and manual shift gear selector and automate the two steps. At least two companies are evaluating MTS's two-magnet magnetostrictive position for sensing both linear and rotary motion of the shift shaft as it moves through an H pattern to select the appropriate gear cluster. Engineers say that the sensor resolution can be up to 2 microns, although a version targeted at lower-cost applications has a resolution on the order of 40 microns.
Advertised as the "Most Powerful Tablet Under $100," the Kindle Fire HD 6 was too tempting for the team at iFixit to pass up. Join us to find out if inexpensive means cheap, irreparable, or just down right economical. It's teardown time!
The increased adoption of wireless technology for mission-critical applications has revved up the global market for dynamic electronic general purpose (GP) test equipment. As the link between cloud networks and devices -- smartphones, tablets, and notebooks -- results in more complex devices under test, the demand for radio frequency test equipment is starting to intensify.
Much of the research on lithium-ion batteries is focused on how to make the batteries charge more quickly and last longer than they currently do, work that would significantly improve the experience of mobile device users, as well EV and hybrid car drivers. Researchers in Singapore have come up with what seems like the best solution so far -- a battery that can recharge itself in mere minutes and has a potential lifespan of 20 years.
Some humanoid walking robots are also good at running, balancing, and coordinated movements in group settings. Several of our sports robots have won regional or worldwide acclaim in the RoboCup soccer World Cup, or FIRST Robotics competitions. Others include the world's first hockey-playing robot and a trash-talking Scrabble player.
Focus on Fundamentals consists of 45-minute on-line classes that cover a host of technologies. You learn without leaving the comfort of your desk. All classes are taught by subject-matter experts and all are archived. So if you can't attend live, attend at your convenience.