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Methods, systems and sensor arrays are provided implementing techniques for detecting an analyte in a fluid. The techniques include providing a sensor array including at least a first sensor and a second sensor in an arrangement having a defined fluid flow path, exposing the sensor array to a fluid

Methods, systems and sensor arrays are provided implementing techniques for detecting an analyte in a fluid. The techniques include providing a sensor array including at least a first sensor and a second sensor in an arrangement having a defined fluid flow path, exposing the sensor array to a fluid including an analyte by introducing the fluid along the fluid flow path, measuring a response for the first sensor and the second sensor, and detecting the presence of the analyte in the fluid based on a spatio-temporal difference between the responses for the first and second sensors.

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1. A system for identifying an analyte in a fluid, comprising:a fluid flow chamber having a first end and a second end; a sensor array including at least a first sensor and a second sensor in an arrangement in the fluid flow chamber such that at least the first sensor is proximal to the first end of

1. A system for identifying an analyte in a fluid, comprising:a fluid flow chamber having a first end and a second end; a sensor array including at least a first sensor and a second sensor in an arrangement in the fluid flow chamber such that at least the first sensor is proximal to the first end of the flow chamber and at least the second sensor is proximal to the second end of the flow chamber thereby having a defined fluid flow path, wherein a fluid moving in the fluid flow chamber contacts the at least two sensors at different times; a measuring apparatus coupled to the sensor array, the measuring apparatus being configured to detect a response from the first sensor and the second sensor upon exposure of the sensor array to the fluid; and a computer configured to generate data indicating the analyte in the fluid based on a spatio-temporal difference between the responses for the first and second sensors and identifying the analyte based upon the spatio-temporal difference. 2. The system of claim 1, wherein:the data includes a spatio-temporal response profile derived from the spatio-temporal difference between the responses for the first and second sensors. 3. The system of claim 2, wherein:the spatio-temporal response profile is derived from time information indicating the dependence of sensor response on time. 4. The system of claim 3, wherein:the first sensor occupies a first position in the arrangement and the second sensor occupies a second position in the arrangement, such that the response of the second sensor is delayed in time with respect to the response of the first sensor upon exposure of the sensor array to the fluid. 5. The system of claim 3, wherein:the first sensor occupies a first position in the arrangement and the second sensor occupies a second position in the arrangement, such that the response of the second sensor is changed in amplitude with respect to the response of the first sensor upon exposure of the sensor array to the fluid. 6. The system of claim 5, wherein:the first sensor includes a sensing material; and the response of the first sensor is greater than the response of the second sensor for an analyte having a high affinity for the sensing material. 7. The system of claim 4, wherein:the first and second sensors are selected and arranged to provide a first delay between the response of the first sensor and the response of the second sensor upon exposure of the sensor array to a fluid including a first analyte and a second delay between the response of the first sensor and the response of the second sensor upon exposure of the sensor array to a fluid including a second analyte. 8. The system of claim 7, wherein:the measuring apparatus is configured to measure the delay between the response of the first sensor and the response of the second sensor; and the spatio-temporal difference between the responses for the first and second sensors is derived from the delay. 9. The system of claim 8, wherein:the computer is configured to characterize the analyte based on the spatio-temporal difference between the responses. 10. The system of claim 2, further comprising:a flow controller to introduce the fluid to the sensor array at a varying flow rate. 11. The system of claim 10 wherein:the computer is configured to generate flow information indicating the dependence of sensor response on flow rate. 12. The system of claim 2, wherein:the sensor array includes a plurality of cross-reactive sensors. 13. The system of claim 2, wherein:the sensor array includes a plurality of sensors selected from the group including surface acoustic wave sensors, quartz crystal resonators, metal oxide sensors, dye-coated fiber optic sensors, dye-impregnated bead arrays, micromachined cantilever arrays, composites having regions of conducting material and regions of insulating organic material, composites having regions of conducting material and regions of conducting or semiconducting organic material, chemically-sensitive resistor or capacitor films, metal-oxide-semiconductor field effect transistors, and bulk organic conducting polymeric sensors. 14. The system of claim 2, wherein:the first and second sensors comprise composites having regions of a conducting material and regions of an insulating organic material. 15. The system of claim 2, wherein:the first and second sensors comprise composites having regions of a conducting material and regions of a conducting organic material. 16. The system of claim 2, wherein:the computer is configured to generate a digital representation of the analyte based at least in part on the responses of the first and second sensors. 17. The system of claim 16, further comprising:a communications port coupled to the computer for communicating the digital representation of the analyte to a remote location for analysis. 18. A system for detecting an analyte in a fluid, comprising:a sensor array including a first sensor and a second sensor; a fluid flow chamber comprising a fluid inlet proximate to the first sensor of the sensor array, and wherein the second sensor is further distal to the fluid inlet thereby defining a fluid flow pattern such that the first and second sensors are located at different locations in the sensor array relative to the fluid flow pattern, wherein a fluid moving in the defined fluid flow pattern contacts the at least two sensors at different times; a measuring apparatus connected to the sensor array, the measuring apparatus being configured to detect a response from the first sensor and the second sensor upon exposure of the sensor array to the fluid, the responses for the first and second sensors based on the locations of the sensors relative to the fluid flow pattern; and a computer configured to generate data indicating the analyte in the fluid based on a spatio-temporal difference between the responses for the first and second sensors and identifying the analyte based upon the spatio-temporal difference. 19. The system of claim 18, wherein:the spatio-temporal difference is derived from time information indicating the dependence of sensor response on time. 20. The system of claim 19, wherein:the first sensor occupies a first position relative to the fluid flow pattern and the second sensor occupies a second position relative to the fluid flow pattern, such that the response of the second sensor is delayed with respect to the response of the first sensor upon exposure of the sensor array to the fluid. 21. The system of claim 19, wherein:the first sensor occupies a first position relative to the fluid flow pattern and the second sensor occupies a second position relative to the fluid flow pattern, such that the response of the second sensor is changed in amplitude with respect to the response of the first sensor upon exposure of the sensor array to the fluid. 22. The system of claim 21, wherein:the first sensor includes a sensing material; and the response of the first sensor is greater than the response of the second sensor for an analyte having a high affinity for the sensing material. 23. The system of claim 20, wherein:the first and second sensors are selected and arranged to provide a first delay between the response of the first sensor and the response of the second sensor upon exposure of the sensor array to a fluid including a first analyte and a second delay between the response of the first sensor and the response of the second sensor upon exposure of the sensor array to a fluid including a second analyte. 24. The system of claim 23, wherein:the measuring apparatus is configured to measure the delay between the response of the first sensor and the response of the second sensor; and the spatio-temporal difference between the responses for the first and second sensors is derived from the delay. 25. The system of claim 19, further comprising:a computer configured to characterize the analyte based on the spatio-temporal difference between the responses. 26. The system of claim 18, further comprising:a flow controller to introduce the fluid to the sensor array at a varying flow rate. 27. The system of claim 26, wherein:the measuring apparatus is configured to measure flow information indicating the dependence of sensor response on flow rate. 28. The system of claim 18, wherein:the sensor array includes a plurality of cross-reactive sensors. 29. The system of claim 18, wherein:the sensor array includes a plurality of sensors selected from the group including surface acoustic wave sensors, quartz crystal resonators, metal oxide sensors, dye-coated fiber optic sensors, dye-impregnated bead arrays, micromachined cantilever arrays, composites having regions of conducting material and regions of insulating organic material, composites having regions of conducting material and regions of conducting or semiconducting organic material, chemically-sensitive resistor or capacitor films, metal-oxide-semiconductor field effect transistors, and bulk organic conducting polymeric sensors. 30. The system of claim 18, wherein:the first and second sensors comprise composites having regions of a conducting material and regions of an insulating organic material. 31. The system of claim 18, wherein:the first and second sensors comprise composites having regions of a conducting material and regions of a conducting organic material. 32. The system of claim 25, wherein:the computer is configured to generate a digital representation of the analyte based at least in part on the responses of the first and second sensors. 33. A system for detecting an analyte in a fluid, comprising:a sensor array including a first sensor and a second sensor; a fluid flow chamber comprising a first end and a second end, whereby the first and second sensors occupy different locations in the sensor array relative to the first end and second end of the fluid flow chamber, wherein a fluid moving in a defined fluid flow path contacts the at least two sensors at different times; a measuring apparatus connected to the sensor array, the measuring apparatus being configured to detect a response from the first and second sensor upon exposure of the sensor array to the fluid flow, the response differences based on the locations of the sensors in the sensor array relative to the fluid flow; and a computer configured to generate data indicating the analyte in the fluid based on a spatio-temporal difference between the responses for the first and second sensors and identifying the analyte based upon the spatio-temporal difference. 34. The system of claim 33, wherein:the spatio-temporal difference is derived from time information indicating the dependence of sensor response on time. 35. The system of claim 34, wherein:the first sensor occupies a first position relative to the fluid flow and the second sensor occupies a second position relative to the fluid flow, such that the response of the second sensor is delayed with respect to the response of the first sensor upon exposure of the sensor array to the fluid. 36. The system of claim 34, wherein:the first sensor occupies a first position relative to the fluid flow and the second sensor occupies a second position relative to the fluid flow, such that the response of the second sensor is changed in amplitude with respect to the response of the first sensor upon exposure of the sensor array to the fluid. 37. The system of claim 36, wherein:the first sensor includes a sensing material; and the response of the first sensor is greater than the response of the second sensor for an analyte having a high affinity for the sensing material. 38. The system of claim 35, wherein:the first and second sensors are selected and arranged to provide a first delay between the response of the first sensor and the response of the second sensor upon exposure of the sensor array to a fluid including a first analyte and a second delay between the response of the first sensor and the response of the second sensor upon exposure of the sensor array to a fluid including a second analyte. 39. The system of claim 38, wherein:the measuring apparatus is configured to measure the delay between the response of the first sensor and the response of the second sensor; and the spatio-temporal difference between the responses for the first and second sensors is derived from the delay. 40. The system of claim 33, further comprising:a computer configured to characterize the analyte based on the spatio-temporal difference between the responses. 41. The system of claim 33, further comprising:a flow controller to vary the rate of the fluid flow. 42. The system of claim 41, wherein:the measuring apparatus is configured to measure flow information indicating the dependence of sensor response on flow rate. 43. The system of claim 33, wherein:the sensor array includes a plurality of cross-reactive sensors. 44. The system of claim 33, wherein:the sensor array includes a plurality of sensors selected from the group including surface acoustic wave sensors, quartz crystal resonators, metal oxide sensors, dye-coated fiber optic sensors, dye-impregnated bead arrays, micromachined cantilever arrays, composites having regions of conducting material and regions of insulating organic material, composites having regions of conducting material and regions of conducting or semiconducting organic material, chemically-sensitive resistor or capacitor films, metal-oxide-semiconductor field effect transistors, and bulk organic conducting polymeric sensors. 45. The system of claim 33, wherein:the first and second sensors comprise composites having regions of a conducting material and regions of an insulating organic material. 46. The system of claim 33, wherein:the first and second sensors comprise composites having regions of a conducting material and regions of a conducting organic material. 47. The system of claim 40, wherein:the computer is configured to generate a digital representation of the analyte based at least in part on the responses of the first and second sensors.