Absorption Cell With Variable Path Length
Original Publication Date: 1984-Feb-01
Included in the Prior Art Database: 2005-Feb-02
An immersible absorption cell for continuously monitoring optical extinction in liquids uses two optical fibers having their ends mounted in a plastic fixture, by which the distance between the parallel planar end faces of the fibers can be mechanically controlled for adjusting the absorption length. Fig. 1 shows an embodiment where two fibers 1a, 1b are each mounted in symmetrical fixtures 2a, 2b which can be displaced relative to each other by a suitable mechanical guide system, e.g., a thread. Fixtures 2a, 2b have openings allowing the liquid to enter the space between the planar end faces of the fibers.