Novel tilt sensor employs echolocation technique14 May 2013
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Yu and his co-workers built on the success that so-called 'capacitive micromachined ultrasonic transducers' (CMUTs) have achieved over the past decade in generating and detecting ultrasound signals. These devices are fabricated using silicon micromachining technology, so the components are very compact and can be conveniently integrated with standard electronics components, which are also based on silicon.
"Our main goal was to explore a new application of the CMUT device," said Yu. Consequently, the researchers harnessed these ultrasonic components for measuring tilt angles. They used three micromachined CMUTs—two senders and a common receiver—each measuring less than a tenth of a millimetre across. To test this array, they immersed it in a bath filled with oil. As they tilted the device, the oil surface stayed level—in the same manner that the water surface in a tilted glass would remain horizontal. However, the distances between the surface and the sensors at the bottom changed such that one sensor became closer to the surface than the other.
By measuring how long it took the ultrasound waves to travel from each of the senders to the receiver, via the oil surface where the waves were reflected, Yu and his co-workers could accurately determine the distances between the sensors and the surface. They could then calculate the tilt angle that the CMUT array had relative to the oil surface.
As many devices already contain ultrasonic components, the new sensor should be useful in a number of applications, according to Yu. "As one example, in an automotive robotic arm equipped with ultrasound transducers for fault detection, a tilt-sensing function should help improve the arm-control accuracy without greatly increasing the complexity of the device," he explained.
Other areas where tilt-angle measurements are important include level determination for instrumentation and motion-state monitoring. With the team's innovation, such functionality may now be added to ultrasonic medical-imaging and non-destructive materials-testing devices.
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