Attivissimo, F.; Carducci, C.G.C.; Lanzolla, A.M.L.; Massaro, A.; Vadrucci, M.R., "A
Portable Optical Sensor for Sea Quality Monitoring," Sensors Journal, IEEE , vol.15, no.1, pp.146,153, Jan. 2015
doi: 10.1109/JSEN.2014.2340437
Abstract: In this paper, we propose the modeling, the design, and the development of a high sensitivity cheap optical sensor for chlorophyll a and water transparency based on chlorophyll fluorescence and turbidity due to scattering for in situ monitoring of trophic status of seawater. The sensor is designed in order to detect very low chlorophyll concentration and low level turbidity by means of a numeric lock-in amplifier technique, with a common resonant input stage. The sensor is designed and implemented by considering a proper layout suitable for a good light source coupling. The presented prototype integrates on a board two LED sources emitting red and blue light to measure both chlorophyll-a and turbidity. The system assures a chlorophyll sensitivity of 1 mV/2.5
g/l, a detectivity of 0.2 g/l, with a 40-dB minimum attenuation of all the other light
μ μ
sources. It is attractive with respect to commercial systems because it guarantees considerable reliability with low manufacturing costs.
keywords: {oceanographic equipment;oceanographic techniques;seawater;water quality;LED sources;blue light;chlorophyll a;chlorophyll fluorescence;commercial
systems;common resonant input stage;high sensitivity cheap optical sensor;light source coupling;manufacturing costs;numeric lock-in amplifier technique;portable optical
sensor;red light;sea quality monitoring;seawater trophic status;turbidity;water transparency;Fluorescence;Monitoring;Noise;Optical sensors;Resistors;Sea
measurements;Optical sensing;chlorophyll;fluorescence;lock in;sea water monitoring}, URL: http://ieeexplore.ieee.org/stamp/stamp.jsp?
