Journal of Sensor Science and Technology (센서학회지)

The Korean Sensors Society (한국센서학회)
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Analysis of the Causes of Errors in Sound Wave Phase Meter

음파위상측정기의 오차 원인에 대한 분석

  • Kim, So-Hee (Department of Physics, Kongju National University) ;
  • Lee, Ki-Won (Department of Physics, Kongju National University)
  • Received : 2019.09.02
  • Accepted : 2019.09.30
  • Published : 2019.09.30
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Abstract

Recently, a sound wave phase meter (SWPM) that can directly measure the pressure waveform of sound waves in free space has been reported, and the development of educational experimental equipment using this meter is in progress. One of the main advantages of using this meter is that wavelengths can be obtained directly from the crests and troughs of the measured pressure waveforms in space without expensive equipment. However, there are times when the measurement wavelength does not exactly match the actual wavelength value, and the pressure waveform differs from the actual shape. This study was conducted to identify and analyze the causes of such errors occurring in SWPM. As a result, it was found that wavelength errors occur when the propagation direction of sound waves and the measurement direction of SWPM do not coincide. It has also been found that an error in the pressure waveform is generated when the induction and sound wave signal outputs from the SWPM interfere with each other to produce a composite signal. We have shown that we can develop educational experimental equipment by suggesting ways to reduce such errors.

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References

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