Claims
- 1. A shaded transducer for providing an output signal in response to impingement of acoustic energy comprising:
- (A) a thin-walled cylindrical member of transducer material and having a central longitudinal axis;
- (B) first and second electrodes respectively deposited on the inner and outer wall surfaces of said thin-walled cylindrical member;
- (C) at least one of said electrodes covering less than the entire wall surface on which it is deposited;
- (D) said one electrode being deposited in a particular pattern, the edges of which are smooth continuous lines;
- (E) said pattern being defined by a plurality of identical longitudinal sections symmetrically disposed about said longitudinal axis;
- (F) each said section touches a neighboring section midway between the ends of said thin-walled cylindrical member;
- (G) a preamplifier having first and second inputs;
- (H) said first and second electrodes being electrically connected to said first and second inputs.
- 2. Apparatus according to claim 1 wherein:
- (A) said lines are curved lines.
- 3. Apparatus according to claim 1 wherein:
- (A) said electrode on said inner wall surface covers the entire surface thereof.
- 4. Apparatus according to claim 1 wherein:
- (A) said sections taper from a maximum circumferential dimension at the middle of said thin-walled cylindrical member to a minimum at its ends.
Government Interests
The Government has rights in this invention pursuant to contract General Order No. 42636.
US Referenced Citations (3)
Number |
Name |
Date |
Kind |
3355603 |
Hesse et al. |
Nov 1967 |
|
4525645 |
Shirley et al. |
Jun 1985 |
|
4538251 |
Steetle |
Aug 1985 |
|