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Cheapening the Cost of Motion Sensors
Motion sensors are starting to creep into a whole plethora of applications. They are the linch pins of haptics, of 3D pointers, of stress based sensor networks and locomotive VR interfaces. Yet, there's a problem. Small, discrete motion sensors, tiny enough to be built into larger devices the size say, of a Wii-remote or a 6 ounce HMD, are extremely difficult and expensive to produce. They require a similar level of precision to the manufacture of silicon chips - and a similar level of expense. If a way could be found to produce them at a substantially cheaper cost, the knock-on effect would go a long ways towards bringing everything from prosthetic limbs to sensor wands much closer to mainstream. A new approach, pioneered by MIT, looks to offer real hope of that for the first time. Researchers at MIT's Center for Bits and Atoms (have built a motion sensor that consists of a tiny metal bead suspended in what is essentially a microscopic hole drilled in a circuit board. The same boards that comprise the mainstay of most devices in fact. This bead is held aloft in the middle of the hole by a tiny fluctuating electric field. This allows it to do the work of six normal sensors, as the bead is free to move in all three axis within the space - up, down, left, right, front, back, all with a single sensor. This is an immediate reduction in cost six-fold, and change. The lack of mechanical parts greatly further reducing cost of the sensor, whilst the reduction in sensor number reduces both bulk and weright for a full three axis (six degrees of freedom) sensor.
ReferencesMicrosensors without microfabrication Staff Comments
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