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Evaluation of a method to measure water content in porous media by employing ultrasound
Evaluación de un método para la determinación de humedad en un medio poroso empleando ultrasonido
DOI:
https://doi.org/10.15446/ing.investig.v23n2.14575Keywords:
Water content, ultrasonic, porous media, transducers, real time, nondestructive test, transmitter, receiver, piezoelectric, rice, sand, model, Matlab, circuits, data acquisition (en)contenido de humedad, ultrasonido, medios porosos, transductores, tiempo real, forma no destructiva, emisor, receptor, piezoeléctrico, arroz, arena, modelo, matlab, circuitos, adquisión de datos (es)
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A method to measure water content in porous media, such as soils and grains, was developed as a real time nondestructive test. The method was based on piezoelectric ultrasonic transducers as a sensor system. Transmitters and receivers was developed to administrate the sensors system and ultrasonic signal. Transmitters and receivers are placed facing each other and located inside the porous media 10 cm apart. The method was evaluated in two porous media, namely a column 30 cm coarse sand and a paddy rice variety Fedearroz 50, in order to evaluate the sensors system performance in two different porous media with different water holder capacity. Tools were developed for data acquisition, capacity of 16 analog signal, 12 bits resolution. Electronic circuits, C++ OOP programming and Matlab were used. The results showed a monotonically increment of millivolts as a response of the transducer as the water content was decreasing.
Se desarrolló un método que emplea ultrasonido con una frecuencia de 40 KHz para la toma de medidas de contenido de humedad en medios porosos, tales como granos biológicos y suelos agrícolas, en forma no destructiva y en tiempo real. El método se basa en el empleo de un sistema de transductores de ultrasonido de tipo piezoeléctrico, conformado por transductor emisor y transductor receptor enfrentados, ubicados en el interior del medio poroso con una separación de 10 cm. El método se evaluó en un medio inerte, arena gruesa, y un medio biológico, arroz paddy variedad Fedearroz 50, con el objetivo de estudiar la respuesta del sistema en dos medios con características distintas y diferentes capacidades de retención de humedad. Se hizo énfasis en los aspectos ingenieriles del método para la propagación acústica en medios porosos, en el desarrollo de circuitos electrónicos, de sistemas de adquisición de datos y de software en C++ OOP y Matlab, para la administración de información.
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Copyright (c) 2003 Luis Leonardo Sáenz Cruz, Édgar Gómez Acero
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