ATTENUATED TOTAL INTERNAL REFLECTION MEASURING DEVICE

Japanese Patent JPH1123451

A

PROBLEM TO BE SOLVED: To prevent the adverse effect of solid particles, gaseous particles, and bubbles, and to enable the absorbance measurement of a liquid by causing total internal reflection both at the inner surface and outer surface of an outer layer and detecting near-infrared rays passing through the outer layer. SOLUTION: A core 39 is isolated from an outer layer 43 by a high purity inner layer 41 so as not to affect total internal reflection at a boundary surface. Light passing through the outer layer 43 is attenuated by the absorption of a liquid in an outer tube in contact with the outer surface of the outer layer 43, and by measuring the absorbance by a detector, the absorbance of the liquid is obtained. In addition, a quartz layer 71 is used for isolating the outer layer 43 of a quartz rod 37 from a case 69 so that total internal reflection is not affected by an adaptor 48 at the outer surface of the outer layer 43 in the overlapping part of the adaptor 48. As absorbance is measured by total internal reflection, it is possible to measure the absorbance of the liquid in contact with the quartz rod 37 without inhibition by solid particles and gaseous particles in the liquid.

HEINZ W SITZLER
URUSURA ESSHENAUWAA

JP16436097A

January 29, 1999

June 20, 1997

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FOSS NIRSYST INC

G01N21/27; G01N21/55; (IPC1-7): G01N21/27

Ariga Gunichiro

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