Fiber optic direct-sensing bioprobe using a phase-tracking approach
First Claim
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1. A method of determining the concentration of a substance in a sample solution, using a fiber optic probe having a reagent at its distal end to which the substance bonds, the method comprising steps of:
- a) immersing the distal end of the fiber optic probe into the sample solution;
b) optically coupling a light source with a proximal end of the fiber optic probe;
c) detecting a first light beam, and a second light beam, reflected at the distal end of the fiber optic probe;
d) detecting an interference pattern formed by the first and second light beams at a first time;
e) detecting an interference pattern formed by the first and second light beams at a second time; and
f) determining whether the substance is present in the sample solution based on whether a shift occurs in the interference patterns.
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Abstract
A fiber optic bioprobe in which an immobilized biolayer, such as an antigen or antibody, acts as a sensing etalon of a Fabry-Perot interferometer. The bioprobe is used in a system in which a shift in the spectral dispersion pattern, caused by reflected out-of-phase beams, is used to determine a concentration of a substance in a sample solution.
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Citations
21 Claims
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1. A method of determining the concentration of a substance in a sample solution, using a fiber optic probe having a reagent at its distal end to which the substance bonds, the method comprising steps of:
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a) immersing the distal end of the fiber optic probe into the sample solution; b) optically coupling a light source with a proximal end of the fiber optic probe; c) detecting a first light beam, and a second light beam, reflected at the distal end of the fiber optic probe; d) detecting an interference pattern formed by the first and second light beams at a first time; e) detecting an interference pattern formed by the first and second light beams at a second time; and f) determining whether the substance is present in the sample solution based on whether a shift occurs in the interference patterns. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A system for detecting the concentration of a substance in a sample solution, the system comprising:
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a) a light source for providing a light beam; b) a fiber optic probe including a fiber optic section having a proximal end for receiving an incident light beam and a distal end tip, and a reagent layer immobilized on the distal end tip, the fiber optic probe for producing at least a first reflected beam and a second reflected beam from the incident light beam; c) a detector for detecting an interference pattern formed by the first and second reflected beams; d) a coupler for optically coupling the light source with the fiber optic probe and for optically coupling the fiber optic probe with the detector; and e) a processor for determining a phase associated with an interference pattern detected by the detector at a first time and for determining a phase associated with an interference pattern detected by the detector at a second time and for determining the concentration of the substance based on a shift in the phases associated with the interference patterns detected by the detector at the first and second times. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification