INSTRUMENT FOR MEASURING SOLUTION COMPONENT

摘要

PURPOSE:To improve the measurement accuracy of the instrument for measuring soln. components and to simplify the operations by introducing the IR rays past interference filters to a total reflecting element by a reflecting mirror and measuring the quantity of the light after the reflection on the inside surface. CONSTITUTION:Plural sheets of the interference filters 5 which allow the transmission of the wavelengths absorbed in a sample to be measured are selected and mounted to a filter wheel 7 rotated by a motor 6. The IR rays past the interference filters 5 are collimated by a lens 8 to collimated beams of light, which are reflected by a circular conical mirror 9 and a circular conical annular reflecting mirror 10 so as to enter a recessed part 11a formed at one end of the total reflecting element 11. The whole reflecting element 11 is provided through a soln. tank 12 and the sample flowing from an inlet 13 to an outlet 14 comes into contact with the outer peripheral surface thereof. The IR rays entering from the recessed part 11a are partly absorbed in the sample in contact with the outer peripheral surface when the rays repeat the reflection on the inside surface within the whole reflecting element 11. These rays enter a photodetector 15 from the recessed part 11b provided at the other end. The incident IR rays on the photodetector 15 are converted to an electric signal, which is amplified 16 and displayed 17.