Method and apparatus for biosensor spectral shift detection
First Claim
1. A method for determining biosensor spectral resonance offsets comprising the steps:
- determining reference band edges of a biosensor reference spectrum;
measuring a sample spectrum from a biosensor;
determining sample band edges of the sample spectrum;
determining a spectral resonance offset in response to reference band edges and the sample band edges.
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Abstract
Performing high-resolution determination of the relative shift of the spectral properties of a biosensor. The shift in the resonance peak of the biosensor is indicative of the amount of material bound to the surface of the biosensor. A preferred biosensor is a Guided Mode Resonant Filter Biosensor (GMRFB). In one aspect of the invention, curve fitting is used to determine the relative location of the spectrum of the unexposed biosensor with respect to those spectra that are altered (e.g., shifted) by the presence of materials bound to the surface of the biosensor. In an alternative embodiment, the cross correlation function is used to detect spectral peak offsets between a reference spectrum and a spectrum measured from an exposed biosensor. In yet another alternative, maximal likelihood estimation techniques are used to determine the spectral shift or offs.
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Citations
11 Claims
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1. A method for determining biosensor spectral resonance offsets comprising the steps:
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determining reference band edges of a biosensor reference spectrum; measuring a sample spectrum from a biosensor; determining sample band edges of the sample spectrum; determining a spectral resonance offset in response to reference band edges and the sample band edges. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification