Title: Resonant surface acoustic wave chemical detector

Abstract

Apparatus for chemical detection includes a pair of interdigitated transducers (IDTs) formed on a piezoelectric substrate. The apparatus includes a layer of adsorptive material deposited on a surface of the piezoelectric substrate between the IDTs, where each IDT is conformed, and is dimensioned in relation to an operating frequency and an acoustic velocity of the piezoelectric substrate, so as to function as a single-phase uni-directional transducer (SPUDT) at the operating frequency. Additionally, the apparatus includes the pair of IDTs is spaced apart along a propagation axis and mutually aligned relative to said propagation axis so as to define an acoustic cavity that is resonant to surface acoustic waves (SAWs) at the operating frequency, where a distance between each IDT of the pair of IDTs ranges from 100 wavelength of the operating frequency to 400 wavelength of the operating frequency.

Inventors:

Brocato, Robert W.; Brocato, Terisse; Stotts, Larry G.

Issue Date:

Tue Aug 08 00:00:00 EDT 2017

Research Org.:

Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

Sponsoring Org.:

USDOE

OSTI Identifier:

1374544

Patent Number(s):

9726646

Application Number:

14/244,767

Assignee:

National Technology & Engineering Solutions of Sandia, LLC

Patent Classifications (CPCs):

G - PHYSICS G01 - MEASURING G01N - INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES

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G - PHYSICS G01 - MEASURING G01N - INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES

G01N2291/012 - Phase angle
G01N2291/014 - Resonance or resonant frequency
G01N2291/0255 -
G01N2291/0256 - Adsorption, desorption, surface mass change, e.g. on biosensors
G01N2291/0423 - Surface waves, e.g. Rayleigh waves, Love waves
G01N2291/102 - one emitter, one receiver
G01N29/022 - {Fluid sensors based on microsensors, e.g. quartz crystal-microbalance [QCM], surface acoustic wave [SAW] devices, tuning forks, cantilevers, flexural plate wave [FPW] devices
G01N29/036 - by measuring frequency or resonance of acoustic waves
G01N29/2437 - {Piezoelectric probes}
G01N29/30 - Arrangements for calibrating or comparing, e.g. with standard objects

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DOE Contract Number:  

AC04-94AL85000

Resource Type:

Patent

Resource Relation:

Patent File Date: 2014 Apr 03

Country of Publication:

United States

Language:

English

Subject:

47 OTHER INSTRUMENTATION; 36 MATERIALS SCIENCE