n - Fachhochschule Jena
n - Fachhochschule Jena
n - Fachhochschule Jena
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Fiber Bragg Grating (FBG)<br />
Sensor and Multiplexing Principle<br />
Fiber Bragg grating: periodic refractive index structure inscribed in fiber core<br />
by illumination with UV laser interference pattern<br />
FBG sensor systems: strain, temperature,…(Wavelength Division Multiplexing)<br />
Λ 1<br />
Grating period Λ≈0.3 µm<br />
Bragg wavelength λB = 2·Λ⋅neff Sensor 1 .. .. Sensor 2 .. 16<br />
Measurands:<br />
e.g., temperature T, strain ε, hydrogen c(H 2 )<br />
Λ 2<br />
Broad-band<br />
input light SLD<br />
800..850nm<br />
Reflected light to<br />
polychromator<br />
λB1 λB2 FOS - 58
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