Thermo-optical method of phrase transformational transduction

Patent metadata

Field	Value
Publication number	US-10686116-B2
Application number	US-201815998482-A
Country	US
Kind code	B2
Filing date	Aug 16, 2018
Priority date	Aug 18, 2017
Publication date	Jun 16, 2020
Grant date	Jun 16, 2020

Abstract

Described herein is the use of large phase transformational strain in relaxor ferroelectric single crystals for broadband sound generation. The technique exploits the thermo-optical triggering and thus an opto-acoustic effect of ferroelectric phase transformation piezocrystals under mechanical bias conditions.

First claim

What is claimed is:

1. A method of acoustic transduction comprising:
providing a [011] poled crystal of Pb(In 1/2 Nb 1/2 )O 3 —Pb(Mg 1/3 Nb 2/3 )O 3 —PbTiO 3 (PIN-PMN-PT) subject to a compressive mechanical pre-loading stress and operably connected to a diaphragm; and
heating the PIN-PMN-PT crystal with a laser thereby causing a phase transition in the PIN-PMN-PT crystal, wherein the phase transition is sufficient to cause emission of an acoustic signal from the diaphragm.

2. The method of claim 1 , wherein a strain transfer rod transfers movement of the PIN-PMN-PT crystal to the diaphragm.

3. The method of claim 1 , wherein the laser is a green continuous wave laser.

4. An acoustic transducer comprising:
a [011] poled crystal of Pb(In 1/2 Nb 1/2 )O 3 —Pb(Mg 1/3 Nb 2/3 )O 3 —PbTiO 3 (PIN-PMN-PT) contained in a mount that subjects the PIN-PMN-PT crystal to a compressive mechanical pre-loading stress;
a diaphragm operably connected to the PIN-PMN-PT crystal; and
a source of laser light configured to optically heat the PIN-PMN-PT crystal sufficient to cause a phase transition in the PIN-PMN-PT crystal, wherein the phase transition is sufficient to cause emission of an acoustic signal from the diaphragm.

5. The acoustic transducer of claim 4 , further comprising a strain configured to transfer movement of the PIN-PMN-PT crystal to the diaphragm.

6. The acoustic transducer of claim 4 , wherein the laser is a green continuous wave laser.

Assignees

• Us Gov Sec Navy

Inventors

• Finkel Peter
• Staruch Margo
• Blackmon Fletcher
• Antonelli Lynn

Classifications

• H04R17/00 Primary

  Piezoelectric transducers; Electrostrictive transducers (piezoelectric or electrostrictive elements in general H10N30/00; details of piezoelectric or electrostrictive motors, generators or positioners {H10N30/00}) · CPC title

• H04R23/02

  Transducers using more than one principle simultaneously · CPC title

• H04R23/008

  using optical signals for detecting or generating sound · CPC title

• H04R31/00

  Apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor {(manufacture of microstructural arrangements of deformable or non-deformable structures in general B81C1/00182)} · CPC title

• H04R1/44

  Special adaptations for subaqueous use, e.g. for hydrophone · CPC title