Patent ID: 6956648

Claim:
Miniaturized spectrometer in the form of a probe for determination of the ingredients of a gaseous or liquid fluid with a light source ( 3 ) and a detector ( 2 ), with at least one measurement partial beam and at least one reference partial beam, characterized by the fact that the light of the light source ( 3 ) is optionally fanned out and focused, by means of at least one optical lens ( 8 ), into a substantially parallel beam, that at least one measurement partial beam is passed through a light-transparent window from the probe into the fluid being investigated and through an additional light-transparent window back into the probe, that at least one reference partial beam is guided in the probe interior, that a collecting optics device ( 14 ), comprising at least one lens, diverts the beams to the impingement point of a light guide ( 5 ) or an inlet of the detector ( 2 ), and that a beam selector ( 7 , 7 ′) is provided in the area of the collecting optics ( 14 ) and passes through one of the partial beams and interrupts all the others.