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Optical sensor, sensor arrangement and method for sensing

  • US 10,444,072 B2
  • Filed: 03/16/2018
  • Issued: 10/15/2019
  • Est. Priority Date: 03/21/2017
  • Status: Active Grant
First Claim
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1. An optical sensor for sensing at least one parameter comprising:

  • an optical source configured to provide a source optical signal and a reference spectral profile; and

    a grating arrangement optically coupled to the optical source to receive the source optical signal, the grating arrangement comprising;

    a first chirped fiber Bragg grating (FBG) having a first defined spectral profile,wherein the first defined spectral profile overlaps with a portion of the reference spectral profile,wherein the first chirped FBG is configured, in response to a first change in the at least one parameter interacting with the first chirped FBG, to change from an original state to a first state to shift the first defined spectral profile in a first direction relative to the reference spectral profile, and further configured, in response to the first defined spectral profile being shifted in the first direction, to transmit a first portion of the source optical signal as a first output optical signal corresponding to the first change, wherein a first intensity of the first output optical signal is indicative of the first change, andwherein the first chirped FBG is configured, in response to a second change in the at least one parameter interacting with the first chirped FBG, to change from the original state to a second state to shift the first defined spectral profile in a second direction relative to the reference spectral profile, and further configured, in response to the first defined spectral profile being shifted in the second direction, to transmit a second portion of the source optical signal as a second output optical signal corresponding to the second change, wherein a second intensity of the second output optical signal is indicative of the second change; and

    a second chirped FBG having a second defined spectral profile,wherein the second defined spectral profile overlaps with a portion of the reference spectral profile,wherein the second chirped FBG is configured, in response to a third change in a parameter interacting with the second chirped FBG, to change from an original state to a third state to shift the second defined spectral profile in a third direction relative to the reference spectral profile, and further configured, in response to the second defined spectral profile being shifted in the third direction, to transmit a third portion of the source optical signal as a third output optical signal corresponding to the third change, wherein a third intensity of the third output optical signal is indicative of the third change, andwherein the second chirped FBG is configured, in response to a fourth change in the parameter interacting with the second chirped FBG, to change from the original state to a fourth state to shift the second defined spectral profile in a fourth direction relative to the reference spectral profile, and further configured, in response to the second defined spectral profile being shifted in the fourth direction, to transmit a fourth portion of the source optical signal as a fourth output optical signal corresponding to the fourth change, wherein a fourth intensity of the fourth output optical signal is indicative of the fourth change.

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