LUMOS - A Sensitive and Reliable Optode System for Measuring Dissolved Oxygen in the Nanomolar Range
Fig 2
A cross section of the LUMOS‘ optical assembly. To maximize signal gain and simplify manufacturing a 45° angle layout is employed. The ideal distance of the sensor sheet from the top of the device is about 2–4 mm which is consistent with measurement through a vessel wall. Emission of the sensor is gathered in a short 3 mm fibre light guide and reaches the photodiode through a set of filters designed to reduce ambient and excitation light interference. The reference LED is positioned so that its light can directly reach the diode.