ABSTRACT
References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .679
21.1 Introduction Previous chapters have covered a broad range of technologies and applications in the general eld of optical sensing. Section I is dedicated to an introduction to optical sensing with Chapters 1 and 2 on the fundamentals of optical sensors and the principles of optical metrology. Section II addresses optical measurement principles and techniques, which, aer Chapter 3, focused on the role of optical waveguides in sensing. Chapters 4 through 7 detail how this functionality can be achieved via intensity, interferometric, uorescence, and plasmonic approaches, followed by Chapters 8 through 10, which focused on wavefront sensing and adaptive optics, multiphoton microscopy, and imaging based on optical coherence tomography. Section III is dedicated specically to the eld of optical ber sensing. In Chapter 11, a historic overview of the subject is presented, followed by one on dierent types of optical bers (Chapter 12), light propagating principles, fabrication techniques, and their main characteristics. Chapters 13 and 14 have focused on ber sensing based on light intensity and phase modulation, followed by Chapters 15 and 16 describing multipoint measurements and distributed sensing. Due to importance of ber Bragg grating (FBGs) in the eld of optical sensors, Chapter 17 is dedicated to this topic followed by Chapter 18 on chemical sensors. Section III ends with two chapters (Chapters 19 and 20) describing some applications of ber sensors and issues related to standardization and its impact on measurement reliability.
