Broadband Velocity Control.
Abstract
Among the requirements for future sonar transmitting arrays will undoubtedly be three items: broader bands, lower frequencies, and higher power. The problem of velocity control will be concerned with all three of these requirements. The requirement of broader bands complicates the problem of obtaining velocity control by electrical tuning. One can say that an array has complete velocity control if the amplitude and phase relationships between the input voltages are preserved in the transducer face velocities. At some frequencies it is possible to maintain very close velocity control by proper choice of a tuning reactor, but if a wide band of operation is required, one will have to be content with less than perfect velocity control over most of the band, unless the tuning reactor can be changed. As lower and lower frequencies are required, unless the array designer has very large transducer faces, the separation between adjacent radiators will become small compared to the wavelength in water if a high packing factor is to be maintained. A condition of this sort will tend to increase the mutual impedance effects of the array and this is detrimental to velocity control. The problem will be separated into two parts: array factors (factors external to the transducer), and transducer factors (factors internal to the transducer). This report is mainly concerned with the transducer factors.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 30, 1965
- Accession Number
- ADA072217
Entities
People
- David T. Porter
Organizations
- Navy Underwater Sound Laboratory