Development of a Oxygen Sensor for Marine ... - DTU Nanotech

4 CHAPTER 1. INTRODUCTION
Where
CP = equilibrium oxygen concentration at nonstandard pressure. mg/L.
C ∗ = equilibrium oxygen concentration at 1 atm, mg/L.
P = nonstandard pressure, atm.
PW V = partial pressure of water vapor, atm, calculated from
lnPW V = 11.8571 − 3840.70
T
T = temperature, Kelvin
t = temperature, o C.
− 216.961
T 2
Θ = 0.000975 − 1.426 × 10 −5 t + 6.436 × 10 −8 t 2
(1.6)
(1.7)
As can be seen from the equation, the warmer it gets, the less oxygen
there is the water, as it becomes saturated faster.
Summed up all this gives an idea of how high, or low depending on how
you look at it, the measured values can be expected to be.
1.2 Thesis Outline
In Chapter 2 other ways of using micro technology to measure oxygen is
looked at, and the reason for picking the Clark type sensor.
In Chapter 3 the theory behind the Clark Oxygen sensor, amperometry,
and the potentionstat is explained.
In Chapter 4 the reasons for why the sensor ended up looking as it did
is explained.
In Chapter 5 contains a description of the process to create the sensor.
In Chapter 6 the problems encountered while fabricating the sensor is discussed,
as well as how they were solved.
In Chapter 7 various measurements, tests, and results are presented.