Apparatus and method for sensing parameters using fiber bragg grating (fbg) sensor and comparator

An apparatus, comprising:

• a light source producing an incident optical signal with a wavelength varying in a defined time manner;
• an optical fiber including a Fiber Bragg Grating (FBG) structure configured to sense a parameter, wherein the optical fiber is configured to receive the incident optical signal, wherein the FBG structure is configured to produce a reflected optical signal with a particular wavelength in response to the incident optical signal, and wherein the particular wavelength varies as a function of the parameter;
• a photo detector configured to generate an electrical signal based on the reflected optical signal;
• a comparator configured to generate a signal based on a comparison of the electrical signal to a first threshold;
• and
• a processor configured to generate an indication of the parameter based on the signal.

An apparatus, comprising:

• a light source producing an incident optical signal with a wavelength varying in a defined time manner;
• a first optical fiber including a first Fiber Bragg Grating (FBG) structure configured to sense a first parameter, wherein the first optical fiber is configured to receive the incident optical signal, wherein the first FBG structure is configured to produce a first reflected optical signal with a first particular wavelength in response to the incident optical signal, and wherein the first particular wavelength varies as a function of the first parameter;
• a first photo detector configured to generate a first electrical signal based on the first reflected optical signal;
• a first comparator configured to generate a first signal based on a comparison of the first electrical signal to a first threshold;
• a second optical fiber including a second FBG structure configured to sense a second parameter, wherein the second optical fiber is configured to receive the incident optical signal, wherein the second FBG structure is configured to produce a second reflected optical signal with a second particular wavelength in response to the incident optical signal, and wherein the second particular wavelength varies as a function of the second parameter;
• a second photo detector configured to generate a second electrical signal based on the second reflected optical signal;
• a second comparator configured to generate a second signal based on a comparison of the second electrical signal to a second threshold;
• and
• a processor configured to generate an indication of the parameter based on the first and second signals.