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Schematics of the directivity setup. The whole assembly is placed on top of a water tank in a way to fully immerse the detector. The mounting block is designed to allow positioning of a variety of detectors exactly onto the axis of rotation. The source is then held in place, also under water, centered onto the sensitive area of the transducer. The detector can then be rotated and the angle of incidence, with respect to the face of the source, is read on the protractor.
