Patent ID: 9046389
Filing Date: 2015-06-02
Classification: G01D,G01K,G01L,G02B

Abstract:
1. A method for optical interrogation, comprising: introducing first wavelength-swept light into an optical waveguide according to a first sweep function having a first wavelength sweep direction; interrogating one or more optical elements, having characteristic wavelengths, with the first wavelength-swept light to produce a first set of optical signals, wherein the optical elements are disposed along the optical waveguide; introducing second wavelength-swept light into the optical waveguide according to a second sweep function having a second wavelength sweep direction, wherein the second wavelength sweep direction proceeds from relatively longer wavelengths to shorter wavelengths and is opposite the first wavelength sweep direction; interrogating the one or more optical elements with the second wavelength-swept light to produce a second set of optical signals; and determining a parameter associated with at least one of the optical elements based on the first and second sets of optical signals.