Specialty Optical Fibers Handbook

6.5 FIBERS FOR HIGH-TEMPERATURE–RESISTANT

GRATINGS

Fibers with a high photosensitivity, for an efficient fabrication of fiber Bragg

gratings, are presented in Chapter 9. Here, specialty fibers developed for obtain-

ing high-temperature–resistant fiber gratings are reviewed. The chosen grating

fabrication techniques have a determinant role and will, therefore, also be

reviewed. High-temperature–resistant fiber gratings find an obvious application

for fiber-sensing measurements at high temperatures and in particular the meas-

urement of the high temperatures themselves. Optical fiber thermometry is

especially advantageous in hostile environments, such as in the presence of

corrosive chemicals, high electric, magnetic, or strong radiofrequency fields. ...