Resumo

LEON-MARTINEZ, Javier A.; HERNANDEZ-GOMEZ, Antihus  e  IGLESIAS-CORONEL, Ciro E.. Fundamentals, Design and Evaluation of an Ultrasonic Proximity Sensor with Thermal Compensation. Rev Cie Téc Agr [online]. 2018, vol.27, n.2, pp.1-9. ISSN 2071-0054.

The objective of this work was to design and evaluate, under controlled conditions, a proximity measurement system based on ultrasonic acoustic echolocation, for its implementation in agricultural engineering systems. Likewise, the relevance of the sound propagation speed depending on environment temperature is demonstrated. For that reason, the experiment was conceived to be executed under three different conditions of environment temperature of propagation: 20°C, 30°C and 40°C. A range of measurement interval of 60 cm to intervals of a centimeter was studied. With the data coming from the estimate, derived from the measurement carried out, a statistical analysis was made that allowed establishing that estimated data collections at 20°C, 30°C and 40°C, respectively, have a high association grade with the collection of reference data employed as pattern, with a Pearson correlation coefficient of 0,99 in each case. For this reason, it is possible to affirm that, in the range of distances studied, the device to evaluate is highly lineal (99 %), repetitive and it has a precision comparable with that of the instrument used as pattern

Palavras-chave : proximity measurement; ultrasound; acoustic echolocation; temperature; propagation environment.

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