Description of 23-Bearing 39-Beam Broad Band Inductive Phase Compensator for 16 Element Line Array.
NAVY ELECTRONICS LAB SAN DIEGO CALIF
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This report gives the specifications and design details of the second broad band inductive beam former constructed for NEL Code 3130 for use with a 16 hydrophone, 23 bearing line array system for use at 50 to 500 cps. The inductive broad band phase compensator is introduced in NEL Report 1009 by F. R. Abbott. The theory and performance of phase compensators is discussed in several NEL Reports by Dr. C. J. Krieger and R. P. Kempff. The most useful of these is the Linear Array part of NEL Report 1108 by R. P. Kempff. A memo which describes the first inductive broad band phase compensator is NEL Technical Memorandum 614 by J. Peugh. The beam former is designed for an array of 16 hydrophones spaced six feet apart. The beam formation is done in a 16 transformer 39-beam inductive phase compensator. The primary of each transformer has 600 turns with a tap at 100 turns for use with the low impedance output of the matching amplifier. There are 78 secondary windings on each transformer which vary from 10 to -10 turns. The shading factor An, for any hydrophone, is given by An 10 cos 8-n7.7 where 8-n indicates absolute value, and n is the number of the hydrophone from either end of the array. The shading is introduced on the secondary windings.
- Acoustic Detection and Detectors