Patent ID: 11898919
Assignee: INTELLIGENT FIBER OPTIC SYSTEMS CORPORATION
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 2:
3. A pressure sensor system comprising:
a diaphragm formed by a septum separating a common sidewall of a first blind aperture formed on one end of a rod from a second blind aperture on an opposite end of the rod, the diaphragm having a planar surface of the first blind aperture and a planar surface of the second blind aperture, at least one of the first blind aperture or the second blind aperture coupled to a source of pressure;
an optical fiber having a first fiber Bragg grating (FBG) attached to a sensing region of the diaphragm, the sensing region generating a strain in the first FBG upon application of the source of pressure;
a second FBG attached to a region of the diaphragm which does not generate a strain upon application of the source of pressure;
the first FBG thermally coupled to the second FBG;
an optical interrogator providing broadband excitation to the first FBG and the second FBG, the optical interrogator determining a pressure and optionally a temperature from a wavelength from the first FBG and a wavelength from the second FBG wavelength responses;

the optical interrogator configured to determine a pressure Pm1 or Pm2 from a wavelength from the first FBG and a wavelength from the second FBG wavelength using:

Pm1=C1λ1m1−C1λ01+C2λ2m1−C2λ02 

Pm2=C1λ1m2−C1λ01+C2λ2m2−C2λ02 

where:
C1, C2, λ01, and λ02 are calibration constants.