Principle of Operation
The beam from the laser passes through a system of patented optics which firstly split the beam into two equal components, the first beam passes through the carrier gas / anaesthetic agent mixture.
In one of the beams, a quarter plate is introduced, which produces a phase difference of 90 degrees between the two orthoganally polarized components of the interferogram.
The orthoganally polarized components are then separated by a beam splitter within the detector unit and these are examined by two photo detectors.
Using a bi-directional counter and fringe fractioning system, the data is then processed by the notebook computer to give direct and automatic readings of gas agent concentrations