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

4.3. TEMPERATURE SENSOR 33
Figure 4.6: Closeup of the working array, there is 150 µm between each electrode
on the left array, and 100 µm between each on the right.
The radius of the green circle (contact area for the working array)
is in both cases 350 µm.
other hand if there is too many in the array, there is a risk of the array starting
to act like a macro scale electrode, where the oxygen will be consumed, hence
corrupt the obtained measurements. Not to mention that the sensor itself
will be used underwater, while being attached to a fish, hence no external
power source is possible. Therefore it is an advantage if it uses as little power
as possible, this equals a smaller battery which in turn will make the overall
size of the finished device as small as possible, and hence it can be attached
to smaller fish. Finally the size and distance also influence the signal output
of the device, as the measured current is partly dependable on these two
parameters.[42, 43]
So it is in large part a question of finding a balance between all the factors,
to ensure the lifetime is as long as possible, without sacrificing accuracy.
Therefore variations on all conceivable variables should be looked into.
4.3 Temperature Sensor
Since the diffusion through the membrane among other things is dependent
on temperature, and there was room to spare on the chip, it was deemed
an advantage to add a temperature sensor (platinum resistance temperature