LIQUID FLOW-CELL FOR INFRARED SPECTRAL PHOTOMETER

摘要

PURPOSE:To prolong a contacting distance of infrared rays with a specimen liquid and enhance the sensitivity in sensing operation by installing infrared fiber in a flexible tube, allowing an infrared ray to penetrate it, and flowing the specimen liquid to a narrow space between the fiber and the tube. CONSTITUTION:Infrared fiber 4 is installed in a flexible tube 2, and the two ends of the fiber 4 are sealed with sealing members 6, 8, and a space 10 is formed between the tube inner surface and the fiber 4. An infrared ray is led by a led 16 and put incident into the fiber 4, and the outgoing infrared rays are condensed by a lens 18 and fed to an infrared sensor. When the eluded liquid of the liquid chromatograph is introduced from the liquid inlet 12 of the tube 2, and upon passing via the space 10 is exhausted from the liquid outlet 14, the infrared ray makes multifold reflections when it passes through the fiber 4, and oozes a little at the interface between the fiber 4 and liquid to be absorbed by the specimen component. Prolonging the tube and fiber provides a greater number of infrared ray reflections, and enlarges the contacting distance of the infrared ray with the specimen liquid, which should enhance the sensitivity in the sensing operation.