Patent ID: 6960770

Claim:
A method for determining the mixture composition of any desired media or for measuring the quantity of a material by means of determining the absorption of light, in particular infrared light, which is emitted by a transmitter ( 12 . 1 , 12 . 2 ) into the medium to be examined and whose nonabsorbed and nonreflected constituents are registered by a receiver ( 18 . 1 , 18 . 2 ), the light being sent through the medium directly from transmitter ( 12 . 1 , 12 . 2 ) to receiver ( 18 . 1 , 18 . 2 ), characterized in that the light crosses a channel ( 10 , 16 ) before and/or after the medium and is scattered at least once, wherein a distance (d) between transmitter ( 12 . 1 , 12 . 2 ) and receiver ( 18 . 1 , 18 . 2 ) is varied.