Tom Martin

US Patent:

20120234818, Sep 20, 2012

Filed:

Mar 16, 2011

Appl. No.:

13/065177

Inventors:

Tom A. Martin - Canton CT, US
Pierre A. Dufilie - Vernon CT, US
Joseph V. Adler - New Milford CT, US

International Classification:

H05B 1/00
H04R 17/00

US Classification:

219210, 29 2535

Abstract:

A surface acoustic wave (SAW) device comprising a piezoelectric substrate having a working surface with an active zone capable of propagating an acoustic wave on said working surface; at least one interdigital transducer on the working surface, having interdigital fingers aligned in the active zone for inducing or receiving surface acoustic waves in the active zone; and a heating element on the working surface; wherein the transducer, heating element and preferably a temperature sensor are monolithically formed on the substrate.

US Patent:

20130328643, Dec 12, 2013

Filed:

Jun 11, 2012

Appl. No.:

13/493536

Inventors:

Tom A. MARTIN - Canton CT, US

International Classification:

H03H 9/64

US Classification:

333193

Abstract:

A surface acoustic wave (SAW) device includes a piezoelectric crystal substrate on which an acoustic channel is formed, at least one electro-mechanical transducer operatively associated with the acoustic channel, and an encapsulating casing having a cover spaced above the acoustic channel and thereby defining a sealed volume around the substrate. A mass deposition device within the casing is spaced between the acoustic channel and the cover, preferably as gold-coated heating wire spanning the acoustic channel and having ends that are connectable to an electric power source outside the casing. Stress and aging shifts can be induced after sealing of the cover. Tuning is achieved by evaporating metal molecules off the heated wire onto the acoustic channel as the frequency is monitored, until the mass loading of metal molecules on the transducer produces the target frequency.