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Construction of a didactic system for wave propagation speed determination in liquids
- Source :
- Revista Brasileira de Ensino de Física, Vol 42 (2020)
- Publication Year :
- 2020
- Publisher :
- Sociedade Brasileira de Física, 2020.
-
Abstract
- Abstract This work shows the construction, calibration and validation of a system to determine sound speed in liquids. We used the pulse method for the measurements. Piezoelectric transducers are used to transmit and receive acoustic wave pulses. The pulse travel time is determined by a counter implemented in a logic programmable device (FPGA). Initially the system is calibrated using pure water. We performed measurements in NaCl and CuSO4 solutions at different concentrations. The system detected speed variations of approximately 1.0 m/s in relation to the concentrations. Therefore, from didactical point of view, it is possible to perform experiments where small changes in the impurities concentration can be detected and measured. Further, the construction or even the enhancement of the system may be stimulant to students devoted to electronic instrumentation.
- Subjects :
- Sound
Electronics
FPGA
Physics
QC1-999
Subjects
Details
- Language :
- Portuguese
- ISSN :
- 18069126
- Volume :
- 42
- Database :
- Directory of Open Access Journals
- Journal :
- Revista Brasileira de Ensino de Física
- Publication Type :
- Academic Journal
- Accession number :
- edsdoj.132f8bf830984016a2ce5d9e5fbae77c
- Document Type :
- article
- Full Text :
- https://doi.org/10.1590/1806-9126-rbef-2020-0239