*** This version of Confluence is for testing only and contains a copy of content from June 29th 2026. No changes will be preserved. ***
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The MicroTOL Turbidimeter manufactured by HF Scientific is used to monitor the influent and effluent turbidities of the laboratory flocculator setup. In the current experimental setup, we are obtaining data sampling turbidity measurements from each turbidimeter in increments of 1 second intervals using Process Controller.
The MicroTOL Turbidimeter is outputing a light sensor, that is then translated into an electrical analog data set that can be read by the computer to output a NTU reading. The frequency of the analog data is a lot faster than 1s, and is averaging the data to give the user a reading every second.a nepthalometer that measures turbidity by sending a beam of light through a sample volume and measuring the intensity of light across the sample volume at 180 degrees and at 90 degrees to compute the amount of scattered light. The light intensity readings measured by the optical sensors are then transduced into an analog voltage signal that can be understood by a microprocessor that can then compute and display a NTU reading. We suspect that the sample frequency of the analog voltage data is much faster than 1 Hz, and that the reported NTU values are an averaged value integrated over one second. We suspect that this onboard integration has averaged out some important information that may give us a more accurate picture of the size and velocity of the flocs passing through the sample volume.
By looking at the analog voltage data, we can decide how to filter the data in a way that will minimize background noise but give us good temporal resolution of the change in turbidity in the sample volume. We should For our experiment, we are trying to find the smallest changes in turbidity over the smallest amount of time. By looking at this "raw" analog data, we might be able to draw better conclusions about particle size and sedimentation velocities this way than from the analyses with the using averaged data. We are currently in contact with HF Scientific to determine how to obtain this analog data.
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