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
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
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.