n - Fachhochschule Jena
n - Fachhochschule Jena
n - Fachhochschule Jena
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FBG Evanescent-Field Chemical Sensing:<br />
Refractometer<br />
Analyte<br />
Evanescent field<br />
Optional transducer layers<br />
Temp. reference FBG<br />
Sensor FBG<br />
Refractometric process control<br />
of petrol products:<br />
Λ<br />
coating<br />
Refractometer Bragg wavelength shift:<br />
Side-polished<br />
optical fiber<br />
embedded in<br />
silica block<br />
Bragg Wavelength [nm]<br />
839,0<br />
838,8<br />
838,6<br />
838,4<br />
838,2<br />
838,0<br />
837,8<br />
Analyte n A<br />
∆λ B = 2·∆n eff (n A )·Λ<br />
1,30 1,35 1,40 1,45<br />
n A H2 O<br />
Ethanol<br />
26%NaCl/H 2 O<br />
OZ91<br />
OZ98<br />
SPO<br />
LMO<br />
DAO<br />
FOS - 77
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