| 摘要 |
<p>There is provided an apparatus (10) for monitoring the relative concentration of an analyte in a fluid stream (F), with such apparatus including a capillary tube (20) for containing the flowing fluid, optics (27, 28) for directing a single beam of monochromatic light (B) through the capillary tube (20) to produce a diffraction pattern (P) having a number of interference fringes (30). A translatable photodiode (46) is provided to monitor a portion of one of the fringes passing through a light limiting slit (44), whereby a signal proportional to the concentration of the analyte in the fluid is produced based upon the varying intensity of the monitored fringe. The capillary tube (20) is preferably provided as a fused silica member having an inner flow diameter of 1000 micrometers or less.</p> |
