Open AccessUric acid detection by using contactless intensity modulation based displacement sensor
Author(s) -
Nin Gan,
Nur Athirah Mohd Taib,
M.J. Abdullah,
Wan Maisarah Mukhtar,
Affa Rozana Abdul Rashid
Publication year - 2019
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1371/1/012020
Subject(s) - uric acid , displacement (psychology) , chemistry , voltage , linearity , intensity (physics) , light intensity , intensity modulation , analytical chemistry (journal) , materials science , optics , chromatography , electronic engineering , electrical engineering , physics , biochemistry , phase modulation , psychology , organic chemistry , engineering , phase (matter) , psychotherapist
A simple and contactless intensity modulated displacement sensor is proposed and demonstrated for sensing uric acid concentration. For a concentration change of uric acid from 0 ppm to 500 ppm, two peak voltages are obtained from the displacement curve correspond to the highest reflectivity of each concentration. Those peak light intensities increase linearly with the concentration due to the increase of the refractive index of the uric acid solution. This implies that the higher concentration of uric acid tends to detect a stronger signal. The measured sensitivities are obtained at 0.0015 V/ppm and 0.0016 V/ppm for the first peak voltage and second peak voltage respectively. The result showed the percentage of similarity for the first peak to the second peak is almost 94% and the linearity more than 97% for both peak voltages is obtained suggested the consistency of the sensor system. The stability and simplicity of the contactless sensor offer a good and valuable opportunity for many applications especially in the hazardous chemical, pharmaceutical, process control and diagnostic sectors.