Patent ID: 6975891

Claim:
An apparatus for measurement of Raman scattered radiation comprising: a) one or more than one source of electromagnetic radiation for producing an electromagnetic radiation beam characterized by a narrow spectral width; b) an integrating cavity comprising: (i) an interior and an exterior, wherein a sample is placed in said interior, said integrating cavity having one or more than one port for insertion of said sample in said interior and for transmission of said electromagnetic radiation into and out from said interior, said one or more than one port extending from said exterior to said interior of said integrating cavity, and (ii) a radiation expanding element for expanding said electromagnetic radiation before said electromagnetic radiation beam comes into contact with said sample; c) a first optical element for transmitting said electromagnetic radiation into said interior of said integrating cavity through said one or more than one port; d) a second optical element for collecting Raman scattered electromagnetic radiation from said sample through said one or more than one port; e) a spectrum analyzer for determining spectral composition of said Raman scattered electromagnetic radiation; f) a detector for measuring said Raman scattered electromagnetic radiation; and g) a system for determining a concentration of one or more than one chemical compound in said sample from Raman scattered electromagnetic radiation measured by said detector.