Title :
SDI-12 based turbidity measurement system with field calibration capability
Author :
Pereira, J. M Dias ; Postolache, O. ; Girao, P. Silva ; Ramos, Helena
Author_Institution :
ESTSetubal, Setubal, Portugal
Abstract :
Turbidity is a measure of how much the material suspended in water decreases the passage of light through the water. In order to carry out accurate turbidity measurements, turbidity-measuring probes require periodic calibration. Classical calibration implies manual. procedures characterized by long calibration time, additional common errors and lower repeatability. The paper presents a distributed turbidity measurement system with field calibration capabilities. The main system elements are turbidity probes, one calibration unit RS232 compatible, three RS232 to SDI-12 converters and a notebook PC. The acquisition and control tasks of the turbidity measurement probes and field calibration unit are implemented using a microcontroller (PIC16F877).
Keywords :
calibration; microcontrollers; notebook computers; peripheral interfaces; turbidity; PIC16F877 microcontroller; RS232 to SDI-12 converters; acquisition tasks; control tasks; distributed turbidity measurement system; field calibration; light passage; notebook PC; turbidity probes; water; Calibration; Current measurement; Gain measurement; Light sources; Optical scattering; Phase detection; Phase measurement; Power measurement; Probes; Voltage;
Conference_Titel :
Electrical and Computer Engineering, 2004. Canadian Conference on
Print_ISBN :
0-7803-8253-6
DOI :
10.1109/CCECE.2004.1347610
