LUCINA II PULSE LASER - Fibreoptical photometers
Photometry of Fluid
With optical methods it is possible to
determine the volume content of discrete ingredients in proportion to the total volume of a multi-phased fluid. For example: Fat droplets in
an emulsion or dispersed particles in a suspension. In laboratories and production-sites this measurement method is performed inline in order
to directly control the mixing-process. Impinging and transmitted light are conducted by glass fibres. Therefore sample mea-surement and data
analysation can by carried out on different places.
Limits of Conventional Photometers
Sensitivity of conventional photometers normally extends form 0 < O.D. < 2.
- As a result of this low sensitivity, measurement is possible only in highly diluted samples.
- To control real fluids with classical methods, a reduction of the measurement distance is made to compensate for the low sensitivity.
New Limtis with OPTIMAGS Photometers
LUCINA II has a measurement-range of about 0 < O.D. < 10. Therefore the sensitivity of this instrument exceeds the classical photometers by orders of magnitude.
- OPTIMAGS photometers permit examinations in media of realistic high concentrations in larger cross sections. It is now possible to make measurements directly (in-line) in the production process.
- Creaming or sedimentation of dispersed phase can be observed in samples of realistic high concentrations (up to 40 - 50 wt. % dispersed phase content).
Ordinary pipe cross sections
Turbidity measurements in liquids are not only possible in cuvettes but also in
systems of tenfold larger pipe cross sections. In many cases, it is now possible to make measurements directly (in-line) in the production
process. For example: Fat content control in whole milk is possible in pipe cross sections up to 25 mm. Alternatively, in a cuvette the same fluid with a tenfold higher dispersed phase content may be analysed.
Test bench and three-channel pulsed laser measuring system
The test bench (Messstand) works with the three-channel pulsed laser to measure the deposition behaviour of particles in liquids. To this purpose, the pulsed laser will first be calibrated by a serie of reference optics. Then, the laser will be driven through different positions along a glass tube, in which the liquid is filled in to measure the distribution of the optical density in the glass tube. This scanning process can be repeated in predefined time unit, so that the temporal variation of the optical density in the liquid will be recorded. Our measurement setup enables also an automatic calibration of the pulsed laser to reduce the external and internal influences.
For further informations, please contact Dr. Clifton Zimmermann.