So, I am working with FBG sensors and I have read that those sensors need to be re-calibrated every 10 years to get accurate measurements. But no where on the internet (AFAIK) is it explained why every 10 years it has to be re-calibrated and why.
Fiber Bragg Grating sensors can reflect a particular wavelength of a light beam or a selection of wavelength in a fiber optic by having the sensors fiber refractive index grated according to specifications to reflect the particular wavelength.
They are used for many applications in fiber optics such as add drop multiplexing and precision measurement of heat and stress.
Because the are precision tools each manufacturer has its own criteria of calibration and set up.
Here is a link to a good educational YouTube video.
You can click on the more link on the bottom of the video and read the physics involved and applications.