Measuring with depolarization of light
| Reference number | |
| Coordinator | RISE Research Institutes of Sweden AB - RISE Research Institutes of Sweden AB, Stockholm |
| Funding from Vinnova | SEK 500 000 |
| Project duration | November 2018 - January 2022 |
| Status | Completed |
Important results from the project
** Denna text är maskinöversatt ** The purpose of the project was to investigate whether it was possible to use the effect of polarization that light has when it hits certain types of particles in raw water. By measuring both absorbance and polarization, the aim was to investigate whether it was possible to optically measure and identify different concentrations of both chemically dissolved substances and particles in raw water.
Expected long term effects
** Denna text är maskinöversatt ** The tests showed that it is possible to optically measure and identify different concentrations of both chemically dissolved substances and particles in raw water with the method. This optical phenomenon, which we call depolarization here, occurs differently for different substances. Thus, it seems possible to use depolarization as a parameter to measure the concentrations of different substances.
Approach and implementation
** Denna text är maskinöversatt ** The measuring system consists of the following components. LEDs with wavelengths 430, 375 resp. 256 nm. A polarizing filter that linearly polarizes the incoming light. A measuring cuvette of flow-through model. The cuvette is made of quartz glass and has inlets and outlets connected to Teflon hoses. The sample is injected through these using a plastic syringe. Fluorescence filter to remove unwanted fluorescence effects. The filters are changed manually and fixed on the beam splitter. A beam splitter that divides incoming light into two channels.