دسته بندی:
اینترنت اشیاء - Internet of Things
سال انتشار:
2022
عنوان انگلیسی مقاله:
Implementation and Calibration of an IoT Light Attenuation Turbidity Sensor
ترجمه فارسی عنوان مقاله:
پیاده سازی و کالیبراسیون سنسور مه آلود تضعیف نور اینترنت اشیا
منبع:
ScienceDirect- Elsevier- Internet of Things, 19 (2022) 100576: doi:10:1016/j:iot:2022:100576
نویسنده:
Jarrod Trevathan
چکیده انگلیسی:
Turbidity is an important characteristic of water quality that can indicate the presence of un-
desirable suspended particulate matter. Having access to an inexpensive and effective turbidity
sensor unlocks numerous Internet of Things (IoT) possibilities for remote environmental moni-
toring. Optical light attenuation turbidity sensors operate on the premise of detecting signal
degradation from a light source due to scattering from particles in a solution. This approach is
technologically unpretentious and only requires a handful of inexpensive electronic components
to construct. However, while this method is touted as “simple”, a significant challenge lies in
sensor calibration. That is, converting an analogue signal into a meaningful and accurate digital
reading in a known turbidity measurement standard (e.g., Nephelometric Turbidity Units (NTU)).
This paper presents an IoT light attenuation turbidity sensor design and explores the calibration
process to determine the sensor’s range and accuracy. Sensor calibration is undertaken using
Formazin turbidity standards and is cross-checked against a commercial turbidimeter. We provide
a step-by-step procedure for determining the correct signal strength to use and a functional form
for the sensor response to the Formazin standard. Finally, we specify an estimate of the accuracy
of the sensor and suggest the next steps in the proposed turbidity sensor’s development. Results
indicate that the sensor achieves within 2%-10% of accuracy at higher ranges (100–4000 NTU),
but its performance becomes significantly less reliable in low NTU ranges (< 100 NTU) where the
error rate increases to 26%. The turbidity sensor is used as part of an IoT remote aquatic envi-
ronmental monitoring platform.
keywords: Internet of underwater things | Turbidity | Affordable sensors | Calibration | attenuation turbidimeter
قیمت: رایگان
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