Patent ID: 6937341

Claim:
A system for enabling substantially simultaneous investigation of a fluid sample with at least two electromagnetic radiation beams, said system comprising a cell, said cell comprising: effective input and output windows; input and output means for entering and exiting fluid sample; an internal volume presenting with a surface therewithin; said system further comprising, in functional combination with said cell, a beam entry element being located, as said system is viewed in upright side elevation, below said surface; such that in use fluid sample is entered to the internal volume of said cell through said input means for entering fluid sample, such that it contacts said surface within said internal volume, and such that one electromagnetic radiation beam is entered through said effective input window of said cell, and a second electromagnetic radiation beam is entered through said beam entry element, to the end that both said first and second electromagnetic beams interact with said fluid sample present on said surface in said internal volume of said cell, each being impinged thereupon obliquely with respect to said surface, so that they then reflect from said sample, exit and enter detector means.