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The relationship between the O
Stern-Volmer equation:4
τ
1
[ ]
O
=
0
−
1
2
τ
K
SV
where:
τ
= decay time
τ
= decay time in the absence of O
0
K
= Stern-Volmer constant (the quenching efficiency)
SV
In order to measure this luminescence decay time, the sensing foil is excited with a blue-green light
modulated at 5 kHz.
The decay time is a function of the phase of the received signal.
In the Oxygen Optode the relationship between the phase and the O
without calculating the decay time.
Figure A 3 shows a typical relationship between the phase measurement and O
400
300
200
100
0
10
Figure A 3 Typical Phase/O
concentration and the luminescence decay time can be described by the
2
2
20
30
Phase shift [degrees]
response
2
page 47 of 93
TD 269 OPERATING MANUAL
OXYGEN OPTODE 4330, 4831, 4835
June 2017
40
50
-concentration is used directly,
2
concentration.
2
60
70
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