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CLASSIFICATION TYPES OF SENSORS (Modulating Scheme utilized (Phase (basic…
CLASSIFICATION TYPES OF SENSORS
Location of modulating region
Extrinsic
Modulation region outside of optical fiber
Transmitting OF sends light into modulation region and received fiber collect modulating signal
Example: Displacement, pressure, liquid level
Intrinsic
Modulation region: in the core of OF
Light enter one end of the fiber modulated by the end of the measurand and detector from the other end
Example: Interferometry sensor of OF
Evanescent
Modulation region : within the cladding of OF
cladding removed and placed with sensiive materials
Example: chemical and biochemical sensor
Modulating Scheme utilized
Intensity
detection of a change in intensity causing changes in measurand
required a referencing technique to compensate intensity not due to measurand
Wavelength
detect the changes in wavelength using spectrometer
no intensity referencing scheme require
high cost
Phase
basic method emloyed is interferometry
most sensitive sensor
using single mode fiber and coherent source
detecting scheme utilized the Michelson and Mach-Zehnder configuration
Michelson interferometer
Mach-Zender Interferometer
Polarization
depends on changes of polarization state of transmission light
Magneto-optic effect
UMMI SHOBIRAH BINTI ALI
