Echolocation is a powerful technique that uses sound or ultrasound waves to locate objects and surfaces. Ships and submarines, for example, use it to avoid collisions, and dolphins and microbats use it to locate prey (see image). A team from the A*STAR Institute of Microelectronics in Singapore has used echolocation to measure the inclination of millimeter-sized ultrasonic sensors. The technique should extend the capabilities of devices that already use ultrasonic components, whether for locating defects in materials, visualizing anatomical structures, or determining range.
The team built on the success that so-called ‘capacitive micromachined ultrasonic transducers’ (CMUTs) have achieved 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.
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 millimeter 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, the team 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.
