Ferrofluid Hydroacoustic Projector.
Abstract
A hydroacoustic projector has been constructed with a ferrofluid as the magneto-acoustic transduction material. It has a toroidal shape; a dc magnetic bias field magnetizes the particles, and an ac field causes bulk movement of the fluid inside the toroid, as contrasted with magnetostriction. The construction of a prototype projector is described. As predicted by theory, the frequency of the acoustic field without bias field is predominantly double that of the exciting frequency; with bias field the single frequency appears in the acoustic measurements. The experimental results show strong resonances from 10 to 100 Hz. They are tentatively ascribed to flexural resonances in the walls of the tank. Further experiments are needed to definitely rule out other sources of sound not originating in the ferrofluid.
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 30, 1985
- Accession Number
- ADA163077
Entities
People
- Mark S. Ptak
- Pieter S. Dubbelday
Organizations
- Florida Institute of Technology