Fluid analysis system and method, for analyzing characteristic properties of a fluid

A fluid analysis system, for analyzing a specified physical characteristic of fluid, comprising:

• a film forming means, for forming a fluid film;
• a film irradiating means, adapted to irradiate said film with electromagnetic radiation to produce an interaction radiation containing information associated with said specified physical characteristic of said fluid;
• a receptor means, for receiving said interaction radiation;
• and
• a detector means, associated with said receptor means, for detecting said interaction radiation,
• wherein said film forming means includes a sampling region defined between opposed fluid contact surfaces, said sampling region being in communication with a fluid inlet to permit feeding therein of said fluid, to form said fluid film having a thickness defined by the distance between said opposed fluid contact surfaces in said sampling region, said fluid contact surfaces being formed on respective contact portions which are mounted for controlled movement with respect to each other, to vary the relative positions of said contact surfaces, at least one of said contact surfaces being pervious to electromagnetic radiation, and said system further comprising of surface cleaning means which effects cleaning of said at least one pervious contact surface, as a result of said controlled movement.