2017•SensorsOpen access

Analysis of Fresnel Zone Plates Focusing Dependence on Operating Frequency

Jose Miguel Fuster, Pilar Candelas, Sergio Castiñeira-Ibáñez, Sergio Pérez-López, Constanza Rubio

Abstract

The focusing properties of Fresnel Zone Plates (FZPs) against frequency are analyzed in this work. It is shown that the FZP focal length depends almost linearly on the operating frequency. Focal depth and focal distortion are also considered, establishing a limit on the frequency span at which the operating frequency can be shifted. An underwater FZP ultrasound focusing system is demonstrated, and experimental results agree with the theoretical analysis and simulations.

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Key concepts: Fresnel zone, Zone plate, Optics, Underwater, Distortion (music), Focal length, Limit (mathematics), Dead zone