Patent ID: 7812312

Claim:
Infrared (IR) measuring device, for essentially simultaneous, qualitative and quantitative determination of components in nonaqueous and aqueous systems, comprising: at least one measuring unit having at least one ATR body and at least one infrared light source, wherein the at least one ATR body has at least two plane, essentially parallel boundary surfaces and is transparent or partially transparent to measuring radiation and has a refractive index which is higher than that of the medium to be investigated adjacent to at least one boundary surface where the measuring radiation is middle infrared radiation (MIR) and can undergo attenuated total reflection at least six times on at least one of the plane, parallel boundary surfaces of the at least one ATR body, wherein the at least one infrared light source includes one or more quantum cascade lasers that can emit electromagnetic radiation of at least one defined frequency or of at least one defined frequency band.