ELECTRO-ACOUSTIC TRANSDUCERS
Assignee
ETAT FRANCAIS REPRESENTE PAR LE DELEGUE GENERAL POUR L'ARMEMENT
Filed
Jun 13, 1984
Granted
Jun 21, 1988
Location
SIX FOURS LES P FR
Abstract
An electro-acoustic transducer according to the invention is of the Tonpilz type comprising a stack of piezo-electric plates placed between a horn and a countermass, and electrodes inserted between the plates. Some of the electrodes are connected to a common excitation or output conductor through phase-shifting circuits which allow the electric voltage of a proportion of these electrodes to be dephased. A logic unit allows the phase-shifting of the electrodes to be distributed within the stack according to several different groupings in dependence upon frequency. One application of the invention is to the construction of long-range power sonars.
Source: Google Patents
35 USC §181 Secrecy Order
Imposed
Nov 19, 1984
Rescinded
Mar 13, 1986
Duration
1 year, 3 months
Inventor
- 1DIDIER BOUCHER
Record Details
- Patent number
- US 4752918
- Application
- 06640145
- Aerospace match
- Yes
- Dataset source
- 35 USC §181 SO records
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