Peter Krämmer

Integrated optical fluorescence multisensor for water pollution

An integrated optical multisensor for organic pollutants has been realised, and characterised for a single analyte. The sensor exploits fluorescence immunoassay in the evanescent field of channel waveguides to enable rapid, simultaneous and high-sensitivity fluorescence detection of up to 32 pollutants in water. The chemical modification used to render the surface specific to analytes allows automatic regeneration for immediate reuse. The system has been demonstrated for the key pollutant estrone and a detection limit below 1 ng/L has been achieved.

Investigation of stator coil and lead temperatures on high voltage inside large power generators via use of fiber Bragg gratings

This paper reports on the first realisation of embedding fiber Bragg grating temperature sensors inside the stator bars and onto the leads of a 200 MVA air cooled power generator. The worlds first measurements of the conductor temperature at high potential during a generator prototype test run demonstrates the feasibility and importance of this measuring technology.

Novel fiber optic bragg grating acceleration sensor detection scheme

We report on the first results of a fiber optic acceleration sensor which consists of two partially spectral overlapping Bragg gratings. The motion of an inertial mass shifts the Bragg reflections of the gratings in different spectral directions and thus modulates the overall amount of reflected light.