A new hope

About the bio sensor that is a crucial part in this project......we
know that it is possible...and that similar sensors exists in the
market presently.....but we are having a tough time getting hold of
one.Since our current focus is on the electronics part....we will be
happy to have a rough idea about the signal from the sensor.I mailed
one Dr.Martin M. F. Choi, PhD9,Associate Professor
Department of Chemistry, Hong Kong Baptist University) and here is
what he mailed me back.....:

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For amperometric glucose biosensor, a dissolved oxygen electrode was
used to capture the change in dissolved oxygen after the enzymatic
reaction. A dissolved oxygen is a Clark-type electrode comprising a Pt
electrode and a Ag electrode. The applied voltage to the electrodes is
about 0.6 V. The current generated is about in mA level (I don't know
exactly the values).

For optical glucose biosensor, the optical signal (at about 610 nm)
was captured by a photomultiplier tube (PMT). Normally, the applied
voltage to the PMT is 1000 V. However, I don't know exactly the
current generated from the optical signal because the PMT used was
from a spectrofluorometer.
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I guess the first one to be more appropriate data for our purposes.I
suppose we could start with a 0.5V to 1.0V, 2mA to 5mA , and a very
low frequency (something like 10hz) signal.

Also check out this site:
http://www.fiso.com/index.php?module=CMS&func=view&id=105&gclid=CL7j8...
It is a fibre optic pressure sensor......but interesting...