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3.2.2 Self-Enclosed FFPI Strain, Pressure, Refractive Index, and Temperature Sensors -- 3.2.3 Sapphire FFPI Sensor -- 3.3 FIB Milling (Tapered Fibers) -- 3.4 Chemical Etching (Doped Fibers) -- 3.4.1 Strain Sensor Fabricated by Chemical Etching -- 3.4.2 Pressure Sensor Fabricated by Chemical Etching -- 3.4.3 Vibration Sensor Fabricated by Combination of Chemical Etching and FIB -- 3.5 Summary -- References -- Chapter 4: Physical and Biochemical Sensors Based on FFPIs -- 4.1 Physical Sensors -- 4.1.1 Temperature Sensors -- 4.1.2 Strain, Displacement, and Force Sensors -- 4.1.3 Pressure Sensors -- 4.1.4 Acoustics and Ultrasonic Sensors -- 4.1.5 Electric- and Magnetic-Related Sensors -- 4.2 Biochemical Sensors -- 4.2.1 Refractive Index Sensors -- 4.2.2 Humidity Sensors -- 4.2.3 Gas Sensors -- 4.2.4 Other Types of Biochemical FFPI Sensors -- 4.3 Temperature-Insensitive or Temperature-Compensated Sensing -- References -- Chapter 5: Interrogation and Multiplexing Techniques for FFP Sensors -- 5.1 Introduction -- 5.2 Intensity Interrogating Methods and Instruments -- 5.2.1 Single-Wavelength Intensity Interrogating Method and Instrument -- 5.2.2 Intensity Interrogating Method with Multiple Wavelengths -- 5.3 Spectral Interrogating for Absolute OPD Demodulation -- 5.3.1 Spectral Interrogation Based on Spectrometers -- 5.3.2 Spectral Interrogation Based on Tunable Filters -- 5.3.3 Spectral Interrogation Based on Swept or Tunable Lasers -- 5.3.4 Comparison of Different Spectral Interrogation Methods -- 5.4 OPD Demodulation Methods -- 5.4.1 OPD Demodulation Based on Spectrum Interrogation and Fringe Counting -- 5.4.2 OPD Demodulation Based on Spectrum Interrogation and Fourier Transform -- 5.4.3 OPD Demodulation Based on Interferometric Scanning in WLI -- 5.4.4 Comparison of OPD Demodulation Methods