A Study of Far Field Directivity Pattern of Bio-Inspired EMFit Emitters

Bats use echolocation to navigate their environment and to localize and identify prey. A biomimetic sensor uses propagation of acoustic energy at higher frequencies to extract information from the environment. EMFit is a new material with very good properties for air. In our attempt to optimize the actual sonar head used by self-governed robots we used this material to construct ultrasound transducers capable of working in a similar way as bats´ emitter. We performed measurements, calculated and analyzed the far field directivity pattern for two types of transducers: linear array and hemi-cylindrical array. Experimental studies of the directivity pattern in far field for these two types of EMFit transducers highlighted the capabilities of these two emitters.