MEMS array development

A prototype device for locating sources of airborne ultrasound has been designed and produced, and is ready for testing. The device consists of an array of eight MEMS microphones optimised to operate in the ultrasound frequency range, and uses beam forming to localise the sound sources. While the presence of ultrasound may be determined with a single microphone, in an open public area, it is often difficult to find the source of the sound. The MEMS array and built-in video camera enables the sound field to be mapped onto a visual representation of the area to enable live identification of the source or sources of the ultrasound. The array is intended to support the measurement of ultrasound in public spaces.