公开(公告)号：US20200186937A1

公开(公告)日：2020-06-11

申请号：US16631721

申请日：2018-07-10

Applicant: BAE SYSTEMS plc

Inventor： LIONEL WILLIAM JOHN KENT

IPC: H04R17/10 ,  B06B1/06 ,  G01S7/521 ,  G10K11/00 ,  G10K11/02 ,  H04B11/00 ,  G01N29/28

Abstract: An electroacoustic transducer array 110 is described. The electroacoustic transducer array 110 comprises a first electroacoustic transducer 40A comprising a first active element 41A and a second electroacoustic transducer 40B comprising a second active element 41B. The electroacoustic transducer array 110 comprises an acoustic coupling layer 43 arranged to acoustically couple, in use, the first active element 41A and the second active element 41B to a transmission medium. The electroacoustic transducer array 110 comprises a first cavity 42A arranged between the first active element 41A and the acoustic coupling layer 43 to receive a first fluid; and/or a second cavity 42B arranged between the second active element 41B and the acoustic coupling layer 43 to receive a second fluid. In this way, acoustic coupling of the electroacoustic transducer array 110 and the transmission medium is improved.

公开(公告)号：US20200068316A1

公开(公告)日：2020-02-27

申请号：US16093507

申请日：2017-03-28

Applicant: BAE SYSTEMS plc

Inventor： LIONEL WILLIAM JOHN KENT

IPC: H04R17/00 ,  H04B10/27

Abstract: According to the present invention, there is provided an electroacoustic transducer, comprising: a first electrode; a second electrode; a piezoelectric material at least partially sandwiched between the first electrode and the second electrode; and an optical aperture extending through the electroacoustic transducer, to allow for optical communication to take place through the electroacoustic transducer.

公开(公告)号：US20200186936A1

公开(公告)日：2020-06-11

申请号：US16631719

申请日：2018-07-10

Applicant: BAE SYSTEMS plc

Inventor： LIONEL WILLIAM JOHN KENT

IPC: H04R17/10 ,  B06B1/06 ,  G01S7/521 ,  G10K11/00 ,  G10K11/02 ,  H04B11/00 ,  G01N29/28

Abstract: An electroacoustic transducer 400 is described. The electroacoustic transducer 400 comprises an active element 410. The electroacoustic transducer 400 comprises an acoustic coupling layer 430 arranged to acoustically couple, in use, the active element 410 to a transmission medium. The electroacoustic transducer 400 further comprises a cavity 420 arranged between the active element 410 and the acoustic coupling layer 430 to receive a fluid. In this way, acoustic coupling of the electroacoustic transducer 400 and the transmission medium is improved.

公开(公告)号：US20190215613A1

公开(公告)日：2019-07-11

申请号：US16093514

申请日：2017-03-28

Applicant: BAE SYSTEMS plc

Inventor： LIONEL WILLIAM JOHN KENT

IPC: H04R17/00 ,  H04R3/00

CPC classification number: H04R17/00 ,  H04B11/00 ,  H04R3/00

Abstract: According to the present invention, there is provided an electroacoustic transducer, comprising: a first electrode; a second electrode; a piezoelectric material at least partially sandwiched between the first electrode and the second electrode; and a flexible electrical connector in electrical connection with the first or second electrode at discrete points around a periphery of that electrode, the discrete points being distributed about a substantial portion of that periphery.

公开(公告)号：US20180078969A1

公开(公告)日：2018-03-22

申请号：US15560927

申请日：2016-03-16

Applicant: BAE SYSTEMS plc

Inventor： LIONEL WILLIAM JOHN KENT ,  COLIN JAMES HARPER

IPC: B06B1/02 ,  H04B11/00

CPC classification number: B06B1/0207 ,  B06B2201/55 ,  H04B11/00

Abstract: There is disclosed an acoustic transducer for communications within an operational bandwidth, the transducer comprising:A signal generator for generating a signal at a centre-frequency within the operational bandwidth;A piezoelectric element having a dielectric constant that varies with temperature;A driving electrode at the surface of the piezoelectric element;A matching network, having a natural frequency at a given temperature, and operable to transfer the signal from the signal generator to the piezoelectric element whilst mitigating electrical loss, the matching network being connected to the driving electrode;Wherein the matching network comprises a temperature compensating capacitor connected in parallel with the piezoelectric element, the temperature compensating capacitor being for counteracting temperature-induced changes to the dielectric constant of the piezoelectric element such that the electrical natural frequency of the transducer is substantially constant over a range of temperatures.