Self-calibrated interrogation system for optical sensors

An optical pressure sensor interrogation system, comprising:

• a light source for providing an optical signal to an optical pressure sensor;
• an optical coupler for receiving a reflected signal from the optical pressure sensor, splitting the reflected signal and providing a first portion of the reflected signal to a high pass filter and a second portion of the reflected signal to a low pass filter;
• a first optical detector for receiving a first filtered signal from the high pass filter;
• a second optical detector for receiving a second filtered signal from the low pass filter;
• and
• a processing circuitry configured to obtain pressure based on a relationship between light intensities of the first and the second optical detector output signals.

An optical pressure sensor interrogation system, comprising:

• a light source for providing an optical signal to an optical pressure sensor;
• a three port filter for receiving a reflected signal from the optical pressure sensor, splitting and filtering the reflected signal and providing a low-pass filtered signal of the reflected signal to a first optical detector;
• a second optical detector to receive a high-pass filtered signal of the reflected signal from the three port filter;
• and
• a processing circuitry configured to obtain pressure based on a relationship between light intensities of the first and the second optical detector output signals.

An optical pressure sensor interrogation system, comprising:

• a first light source and a second light source for providing a first optical signal and a second optical signal;
• a first optical coupler for receiving the first optical signal and the second optical signal and providing a coupled signal to the optical pressure sensor;
• a second optical coupler for receiving a reflected signal from the optical pressure sensor, splitting the reflected signal and providing a first portion of the reflected signal to a first optical detector and a second portion of the reflected signal to a second optical detector;
• and
• a processing circuitry configured to obtain pressure based on a relationship between light intensities of the first and the second optical detector output signals,
• wherein the processing circuitry is further configured to provide a feedback signal to the first and the second light sources to control a wavelength of the first and the second optical signals.

A method of interrogating an optical pressure sensor, comprising:

• providing an optical signal to the optical pressure sensor;
• splitting a reflected signal from the optical pressure sensor into a first signal and a second signal;
• and
• analyzing a filtered first signal and the second signal and to obtain pressure based on subtraction of light intensities of the first and the second optical detector output signals.