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

Claim 9:
10. A pressure sensor system comprising:
a diaphragm formed by a septum separating a 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 comprising a planar surface separating the first blind aperture from the second blind aperture, at least one of the first blind aperture or the second blind aperture configured to be coupled to a source of pressure;
an optical fiber having a first fiber Bragg grating (FBG) configured to be 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 configured to be attached to a region of the diaphragm which does not generate a strain in the second FBG upon application of the source of pressure;
the first FBG thermally coupled to the second FBG;
a wavelength interrogator configured to convert the first FBG wavelength and the second FBG wavelength into a pressure Pm1or Pm2 rom at least one of:

Pm1=C1λ1m1−C1λ01+C2λ2m1−C2λ02 

Pm2=C1λ1m2−C1λ01+C2λ2m2−C2λ02 

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