Variable Pathlength Liquid Spectrophotometer Cell can eliminate
the need for a large collection of different fixed pathlength
cells at an economical price.
The Variable Pathlength Liquid Spectrophotometer Cell consists
of a cylindrical stainless steel chamber containing parallel
windows. The pathlength may be continuously adjusted from
0.05mm to 5mm and reproduced within 0.001mm (1 micrometer).
A vernier scale provided on the cylinder permits the cell
pathlength to be read within 0.0005mm (0.5 micrometer).
In order for weaker absorption bands of many liquids to
appear with the proper intensity, the stronger bands will
be totally absorbed and their exact location thus obscured.
In these situations, the Variable Pathlength Cell may be
precisely adjusted to provide just the right intensity for
exact location of both weak and strong bands.
The Variable Pathlength Liquid Spectrophotometer Cell is
useful in both solvent compensation and differential analysis.
When filled with solvent and mounted in the reference beam
of a dispersive spectrophotometer, its pathlength may be
adjusted to compensate for unwanted solvent absorption in
the sample beam.
In differential analysis, two liquids are examined that
may differ only slightly in the concentration of a minor
component. Careful adjustment of the variable cell pathlengths
will tend to enhance the spectrum of the minor component
contained in a fixed path cell in the sample beam.