WAVELENGTH TRACKER FOR SWEPT WAVELENGTH SENSOR INTERROGATION SYSTEM
First Claim
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1. A swept wavelength interrogation system comprising:
- a tunable light source having a light beam tunable over a range of wavelengths;
an optical reader to distribute the light beam among a plurality of sensors and for measuring response spectra from the sensors; and
a wavelength-tracking device to measure centroid wavelengths of the light beam with a given precision,the light beam having a linewidth that exceeds the given precision of the measured centroid wavelengths.
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Abstract
A swept wavelength interrogation system includes a tunable light source for outputting a light beam that is tunable over a range of wavelengths and an optical reader head for distributing the light beam among a plurality of sensors and for measuring response spectra from the sensors. A wavelength-tracking device measures centroid wavelengths of the light beam. A processor calculates a centroid wavelength of the response spectra from the sensors based on the measured centroid wavelengths of the light beam.
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Citations
21 Claims
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1. A swept wavelength interrogation system comprising:
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a tunable light source having a light beam tunable over a range of wavelengths; an optical reader to distribute the light beam among a plurality of sensors and for measuring response spectra from the sensors; and a wavelength-tracking device to measure centroid wavelengths of the light beam with a given precision, the light beam having a linewidth that exceeds the given precision of the measured centroid wavelengths. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 14, 15, 16)
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12. A wavelength tracking apparatus of a swept wavelength sensor interrogation system to measure a centroid wavelength of sensor resonance, comprising:
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a dispersive optic that alters a spatial position of a light beam as a function of the beam'"'"'s wavelength; a sensor that measures optical power as a function of the spatial position of the light beam, and a processor that converts the measured optical power to a measure of the centroid wavelength of the light beam, and the measured centroid wavelength being used to calculate the centroid wavelength (Ck) of the sensor resonance.
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17. A method of interrogating an array of sensors to measure a response to an analyte proximate to the sensor, comprising:
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tuning a light source to provide a light beam having a range of wavelengths, splitting the light beam to a beam-monitoring pathway and a sensor-interrogating pathway, measuring centroid wavelengths of the light beam along the beam-monitoring pathway, distributing optical power of the light beam among the array of sensors along the sensor-interrogating pathway, measuring optical power returning from the array of sensors, and determining centroid wavelengths of response spectra from the sensors based on the measured centroid wavelengths of the light beam and on the measured optical power returning from the array of sensors. - View Dependent Claims (18, 19, 20, 21)
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Specification