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Appendix 1 Theory of Operation
The Oxygen Optode is based on a principle called dynamic luminescence quenching.
This phenomenon is the ability of certain molecules to influence the fluorescence of other molecules.
Fluorescence is the ability of a molecule to absorb light of certain energy and later emit light with lower
energy (longer wave length). Such a molecule, called a luminophore, will after absorbing a photon with
high enough energy, enter an exited state.
After a while the luminophore will emit a photon of lower energy and return to its initial state. Some types
of luminophores might also return to the initial state when colliding with certain other molecules.
Luminophore in
Luminophore in
initial state
initial state
Absorbing
Absorbing
Photon
Photon
Luminophore in
Luminophore in
excited state
excited state
O
O
not present
not present
2
2
L L
L
Longer life time
Longer life time
L
L
Luminophore
Luminophore
returned to initial
returned to initial
state
state
Figure A 1 Dynamic Luminescence Quenching
L
L
L
L
L L
L
O
O
present
present
2
2
L L
L
Colliding with
Colliding with
Oxygen
Oxygen
O
O
molecule
molecule
2
2
(quenching)
(quenching)
O
O
O
L
L
2
2
2
Energy
Energy
transferred to
transferred to
Oxygen
Oxygen
Shorter
Shorter
molecule
molecule
life time
life time
L
L
page 45 of 93
TD 269 OPERATING MANUAL
OXYGEN OPTODE 4330, 4831, 4835
June 2017
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