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Open AccessArticle

Development and Characterization of a Low-Cost Sensors System for an Acoustic Test Bench

Industrial Engineering and Automotive Department, Universidad Antonio de Nebrija, Pirineos 55, 28040 Madrid, Spain
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Sensors 2020, 20(22), 6663; https://doi.org/10.3390/s20226663
Received: 16 September 2020 / Revised: 13 November 2020 / Accepted: 13 November 2020 / Published: 20 November 2020
(This article belongs to the Special Issue Sensors in Low-Cost Applications)
Existing acoustic test benches are usually costly devices based on proprietary designs, sensors, and acquisition devices. In this paper, a low-cost test bench for acoustic purposes is introduced. The design of the test bench takes into account not only the low-cost mechanical design, but also uses low-cost sensors and control boards. This test bench has been designed for a range of signals compatible with those used by thermoacoustic engines, but it can be useful for applications with similar requirements. Taking advantage of an auxiliary pressure reference, low-cost unidirectional differential pressure sensors can be used to significantly increase the accuracy of the sampling system. The acoustic and mechanical design and development are presented along with the sampling system and the sensors arrangement implemented. Both the sensor and sampling system are evaluated by comparison with a high-fidelity sound acquisition system. An unexpected effect on the time error values distribution of the low-cost acquisition system is found and described. Finally, the errors introduced by the system and the sensors in terms of time and pressure sampling are characterized. As a result, the low-cost system’s accuracy has been satisfactory assessed and validated for the conditions expected in thermoacoustic experiments in terms of frequency and dynamic pressure. View Full-Text
Keywords: DAQ; data acquisition system; low cost; reliability; Arduino; pressure sensing; acoustics; DeltaEC DAQ; data acquisition system; low cost; reliability; Arduino; pressure sensing; acoustics; DeltaEC
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Moreno-Ramírez, C.; Iniesta, C.; González, A.; Olazagoitia, J.L. Development and Characterization of a Low-Cost Sensors System for an Acoustic Test Bench. Sensors 2020, 20, 6663.

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