Measuring and testing – Vibration – Sensing apparatus
Patent
1999-04-09
2000-12-19
Moller, Richard A.
Measuring and testing
Vibration
Sensing apparatus
422 50, 435808, 436805, 436807, G01D 532
Patent
active
061614378
ABSTRACT:
The present invention is directed to a combined SAW sensor and a SPR sensor for evaluating an analyte, as well as a novel method for evaluating an analyte by utilizing a surface acoustic wave (SAW) sensor to determine the mass of the analyte and utilizing a surface plasmon resonance (SPR) sensor to determine the permittivity of the analyte. In accordance with one aspect of the invention, an apparatus is provided for evaluating an analyte. In one embodiment, the apparatus includes a piezoelectric substrate, a SAW sensor disposed on the substrate, and a SPR sensor disposed on the substrate in close proximity to the SAW sensor. In another embodiment, the apparatus more broadly includes a SAW sensor and a SPR sensor coupled to the surface acoustic wave sensor. In a preferred embodiment, the apparatus the SAW sensor includes two interdigital transducers and a chemically sensitive film interposed between the two interdigital transducers. The apparatus further includes an acousto-optic tunable filter (AOTF) disposed on the substrate, and interposed between the SAW sensor and the SPR sensor. The AOTF functions to couple the SAW sensor and the SPR sensor. The SPR sensor includes a chemically sensitive film, and an acoustic absorber is disposed on the substrate and interposed between the AOTF and the chemically sensitive film of the SPR sensor. Finally, an optical fiber may be configured to introduce a broadband light into the substrate, the optical fiber disposed to direct the light through the AOTF, the acoustic absorber, and the chemically sensitive film of the SPR sensor.
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Print-Out of Web Page Entitled "Biosening with SPR", located at URL http://www.chem.vt.edu/chem-dept/students/Earp/intro3.html, Initial Publication Date Unknown but Printed on Mar. 30, 1999.
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Brennan Kevin F.
Hunt William Daniel
Georgia Tech Research Corporation
Moller Richard A.
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