Examinando por Materia "Low-cost spectrophotometer"
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- PublicaciónSólo datosDevelopment of a Low-Cost UV-Vis Spectrophotometer and Its Application for the Detection of Mercuric Ions Assisted by Chemosensors(Sensors, 2020-02-08) González-Morales, David; Valencia, Asmilly; Díaz-Núñez, Astrid; Fuentes-Estrada, Marcial; López-Santos, Oswaldo; García-Beltrán, OlimpoDetection of an environmental contaminant requires the use of expensive measurement equipment, which limits the realization of in situ tests because of their high cost, their limited portability, or the extended time duration of the tests. This paper presents in detail the development of a portable low-cost spectrophotometer which, by using a specialized chemosensor, allows detection of mercuric ions (Hg2+), providing effective and accurate results. Design specifications for all the stages assembling the spectrophotometer and the elements selected to build them are presented along with the process to synthesize the chemosensor and the tests developed to validate its performance in comparison with a high-precision commercial laboratory spectrophotometer.
- PublicaciónSólo datosLow-Cost Spectrophotometer for In-Situ Detection of Mercury in Water(2018 IEEE SENSORS, 2018-10-28) González-Morales, David F.; López-Santos, Oswaldo; García-Beltrán, OlimpoThis paper presents the design and implementation of a low-cost spectrophotometer (LCSPM) for in-situ detection of mercury in water. The proposed device is composed of a white light emitting diode (LED), a diffraction grating (DG), a rotational positioning system, two photodiodes and a low-cost microcontroller. High-resolution angle displacement of DG allows obtaining a selective projection of the visible spectrum on the studied water and the reference during the same test. All required algorithms are embedded into the microcontroller allowing the transfer of the resulting data to a computer. The capability of the proposed LCSPM for detection of mercuric ions (Hg 2 +) in water was tested with the help of a synthesized coumarin and then validated by comparison with a standard device.