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Low-cost GRIN-lens-based nephelometric turbidity sensing in the range of 0.1–1000 NTU

  • Turbidity sensing is very common in the control of drinking water. Furthermore, turbidity measurements are applied in the chemical (e.g., process monitoring), pharmaceutical (e.g., drug discovery), and food industries (e.g., the filtration of wine and beer). The most common measurement technique is nephelometric turbidimetry. A nephelometer is a device for measuring the amount of scattered light of suspended particles in a liquid by using a light source and a light detector orientated in 90°to each other. Commercially available nephelometers cost usually—depending on the measurable range, reliability, and precision —thousands of euros. In contrast, our new developed GRIN-lens-based nephelometer, called GRINephy, combines low costs with excellent reproducibility and precision, even at very low turbidity levels, which is achieved by its ability to rotate the sample. Thereby, many cuvette positions can be measured, which results in a more precise average value for the turbidity calculated by an algorithm, which also eliminates errors caused by scratches and contaminations on the cuvettes. With our compact and cheap Arduino-based sensor, we are able to measure in the range of 0.1–1000 NTU and confirm the ISO 7027-1:2016 for low turbidity values.

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Metadaten
Name:Brecht, Marc
URN:urn:nbn:de:bsz:rt2-opus4-18382
DOI:https://doi.org/10.3390/s18041115
ISSN:1424-8220
Erschienen in:Sensors
Publisher:MDPI
Place of publication:Basel
Document Type:Article
Language:English
Year of Publication:2018
Tag:formazin; nephelometer; nephelometric turbidimeter; turbidity sensing; water monitoring
Volume:18
Issue:4, Aufsatz 1115
Pagenumber:9
First Page:1
Last Page:9
Dewey Decimal Classification:620 Ingenieurwissenschaften und Maschinenbau
Access Rights:Ja
Licence (German):License Logo  Creative Commons - CC BY - Namensnennung 4.0 International