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Title: Light absorption cell combining variable path and length pump

A device is described for use in making spectrophotometric measurements of fluid samples. In particular, the device is a measurement cell containing a movable and a fixed lens with a sample of the fluid there between and through which light shines. The cell is connected to a source of light and a spectrophotometer via optic fibers. Movement of the lens varies the path length and also pumps the fluid into and out of the cell. Unidirectional inlet and exit valves cooperate with the movable lens to assure a one-way flow of fluid through the cell. A linear stepper motor controls the movement of the lens and cycles it from a first position closer to the fixed lens and a second position farther from the fixed lens, preferably at least 10 times per minute for a nearly continuous stream of absorption spectrum data. 2 figures.
Inventors:
Issue Date:
OSTI Identifier:
5356517
Assignee:
PTO; EDB-94-046396
Patent Number(s):
US 5268736; A
Contract Number:
AC09-89SR18035
Resource Relation:
Patent File Date: 28 Feb 1992
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; LIQUIDS; SPECTROPHOTOMETRY; SAMPLE HOLDERS; DESIGN; SPECTROPHOTOMETERS; ABSORPTION SPECTROSCOPY; FIBER OPTICS; FLUIDS; MEASURING INSTRUMENTS; SPECTROSCOPY; 400102* - Chemical & Spectral Procedures