Piezoelectric resonator chemical sensing device
First Claim
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1. A sensing device for measuring an analyte in a medium comprising:
- a piezoelectric resonator having a first side and a second side, the first side having a first electrode thereon and the second side having a second electrode thereon wherein the first electrode has a different geometry than the second electrode whereby the sensing device has a group of resonant frequencies comprising a frequency of maximum admittance, a series resonant frequency and a resonant frequency and a group of antiresonant frequencies comprising a frequency of maximum admittance, a parallel resonant frequency and an antiresonant frequency;
a polymeric layer on the first side of the piezoelectric resonator, at least a portion of the polymeric layer being disposed on the electrode; and
means for sensing at least one resonant frequency and at least one antiresonant frequency.
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Abstract
The present invention comprises a sensor for measuring an analyte in a medium comprising a piezoelectric resonator having a first side with an electroded region and a second opposing side having an electroded region that is different in size and/or shape of the first electrode. The piezoelectric resonator of the present invention is capable of measuring more than one parameter thereby providing a multi-information sensing device. The present invention also includes an apparatus and method for detecting and measuring an analyte in a medium which utilizes the piezoelectric resonator sensor of the present invention.
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Citations
29 Claims
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1. A sensing device for measuring an analyte in a medium comprising:
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a piezoelectric resonator having a first side and a second side, the first side having a first electrode thereon and the second side having a second electrode thereon wherein the first electrode has a different geometry than the second electrode whereby the sensing device has a group of resonant frequencies comprising a frequency of maximum admittance, a series resonant frequency and a resonant frequency and a group of antiresonant frequencies comprising a frequency of maximum admittance, a parallel resonant frequency and an antiresonant frequency; a polymeric layer on the first side of the piezoelectric resonator, at least a portion of the polymeric layer being disposed on the electrode; and means for sensing at least one resonant frequency and at least one antiresonant frequency. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An apparatus for measuring an analyte in a medium comprising:
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a piezoelectric resonator having a first side, and a second opposing side; a source of electric energy, providing an electric signal; a first electrode on the first side of the piezoelectric resonator and a second electrode on the second side of the piezoelectric resonator, wherein the first electrode has a different geometry than the second electrode; a polymeric layer on the first side of the piezoelectric resonator, at least a portion of the polymeric layer being partially disposed on the first electrode; and an electrical sensing circuit sensing at least one of a group of resonant frequencies comprising a frequency of maximum admittance, a series resonant frequency, and a resonant frequency and at least one of a group of antiresonant frequencies comprising a frequency of minimum admittance, a parallel resonant frequency, and an antiresonant frequency of the piezoelectric resonator. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A method of detecting or measuring an analyte in a medium comprising:
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contacting the medium in which there is suspected to be an analyte with a piezoelectric resonator in an apparatus comprising; (a) the piezoelectric resonator having a first side, and a second opposing side; (b) a source of electric energy, providing an electric signal; (c) a first electrode on the first side of the piezoelectric resonator and a second electrode on the second side of the piezoelectric resonator, wherein the first electrode has a different geometry than the second electrode; (d) a polymeric layer on the first side of the piezoelectric resonator, at least a portion of the polymeric layer being partially disposed on the first electrode; and (e) an electrical sensing circuit sensing at least one of a group of resonant frequencies comprising a frequency of maximum admittance, a series resonant frequency, and a resonant frequency and at least one of a group of antiresonant frequencies comprising a frequency of minimum admittance, a parallel resonant frequency, and an antiresonant frequency of the piezoelectric resonator; and measuring the change in the at least one resonant frequency and the at least one antiresonant frequency and correlating the changes in the at least one resonant frequency and the at least one antiresonant frequency to the presence or amount of analyte in the medium. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29)
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Specification