On pinnae design and fabrication technology

The paper presents a design and fabrication technology of the pinnae, i.e. external ear in the context of biomimetic sonar heads building for in air sonar applications. The basic steps and formula of the design process are described followed by a description of the fabrication technology for various sizes and shapes of pinnae. The experimental measurements are focused on voltage sensibility and pattern directivity in horizontal and vertical planes. The results show a voltage gain of parabolic pinnae and a narrow beam in pattern directivity of the ultrasonic bio-mimetic transducers, which makes them suitable for using in image generation applications. The work is important because uses a simple technology to make almost any kind of artificial bio-mimetic shapes of pinnae.