Development and Validation of a New Near-Infrared Sensor to Measure Polyethylene Glycol (PEG) Concentration in Water

Sensors

Olivier Buzzi¹  Shengyang Yuan¹  Benjamin Routley² 

[1] Priority Research Centre for Geotechnical and Materials Modelling, University of Newcastle, Callaghan NSW 2308, Australia;School of Electrical Engineering and Computer Science, University of Newcastle, Callaghan NSW 2308, Australia;

关键词: fibre optic sensor;    distributed feedback laser;    polyethylene glycol (PEG);    near-infrared;   

DOI  :  10.3390/s17061354

来源: DOAJ

【 摘 要 】

A near-infrared absorption based laser sensor has been designed and validated for the real-time measurement of polyethylene glycol (PEG) concentration. The wavelength was selected after the determination of the absorption spectrum of deionised water and PEG solutions using a Varian Cary 6000i spectrophotometer, in order to limit the influence of PEG molecular mass on the absorption measurement. With this new sensor, the water is treated as the attenuating species and the addition of PEG in water reduces the absorbance of the medium. The concept was validated using three different PEG types (PEG 6,000, 20,000, and 35,000) and it was found that the results follow Beer Lambert’s law. The influence of temperature was assessed by testing the PEG 20,000 at four different temperatures that could be encountered in a laboratory environment. The data show a slight temperature influence (increase of absorbance by 8% when the temperature rises from about 20 to about 29 degrees). Following the validation phase conducted ex situ, a prototype of an immersible sensor was built and calibrated for in situ measurements.

【 授权许可】

Unknown