Selected Probes

Needle-type oxygen microsensors are perfectly suited for measuring oxygen distribution profiles in sediment and biofilms with a high spatial resolution of less than 50 µm. The oxygen-sensitive tip of an optical fiber is protected inside a stainless steel needle. This design is optimal for easy penetration of tissue, septum rubber or packaging materials. After penetration the sensor tip is extended for measurement.

Implantable probes are the miniaturized fiber optic oxygen sensors designed for various customized applications. The tiny probe has a tip size of < 50 µm (TS) to 140  µm (TF) while the outer diameter ranges from 140 µm to 900 µm.
The microsensor tip is not mounted in any additional housing. The bare glass fiber tip can be mounted to your own housings, steel tubes and micro respirometer chambers etc. It can be deployed in sealed containers to measure the oxygen content directly.

The light from the blue LED excites the sensor spot to emit fluorescence. If the sensor tip encounters an oxygen molecule, the excess energy is transferred to the oxygen molecule in a non-radiative transfer, decreasing or quenching the fluorescence signal. The degree of quenching correlates to the partial pressure of oxygen in the matrix, which is in dynamic equilibrium with oxygen in the sample. The decay time measurement is internally referenced.