Messverfahren zur Bestimmung kleiner Lichtabsorptionen

EP 443702 A UPAB: 19930928 The measuring system uses quasi-simultaneous detection of the transmission intensity of a measuring beam and a reference light beam having differing wavelengths. The light absorption is measured directly by common analogue evaluation of the detected measured and reference signals (UMC, URC) via a difference amplifier (D), with the difference adjusted to zero when a measurement 'wis obtained without the measured material (MA) to eliminate the difference between the measuring and reference beams. ADVANTAGE - Direct measurement of small light absorption for different materials. 1/