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Sound as Pressure Waves01:17

Sound as Pressure Waves

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Sound waves, which are longitudinal waves, can be modeled as the displacement amplitude varying as a function of the spatial and temporal coordinates. As a column of the medium is displaced, its successive columns are also displaced. As the successive displacements differ relatively, a pressure difference with the surrounding pressure is created. The gauge pressure varies across the medium.
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Most pressure gauges, like those on scuba tanks, are calibrated to read zero at atmospheric pressure. Readings from such gauges are called the gauge pressure, which is the pressure relative to atmospheric pressure. When the pressure inside the tank exceeds atmospheric pressure, the gauge reports a positive value. Some gauges are designed to measure negative pressure. For example, many physics experiments must take place in a vacuum chamber, a rigid chamber from which some of the air is pumped...
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Related Experiment Video

Updated: Feb 26, 2026

The Measurement of Unsteady Surface Pressure Using a Remote Microphone Probe
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Passive Downhole Pressure Sensor Based on Surface Acoustic Wave Technology.

Sully M M Quintero1, Sávio W O Figueiredo2, Victor L Takahashi3

  • 1Mechanical Engineering Department, Pontifical Catholic University of Rio de Janeiro, Rua Marquês de São Vicente 225, 22453-900 Rio de Janeiro, Brazil. sully@puc-rio.br.

Sensors (Basel, Switzerland)
|July 18, 2017
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Summary
This summary is machine-generated.

A new passive surface acoustic wave (SAW) pressure sensor offers real-time monitoring for downhole applications. Its robust design and high sensitivity make it ideal for harsh industrial environments.

Keywords:
SAW devicedownhole applicationpressure sensorwireless sensor

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Area of Science:

  • Materials Science
  • Sensor Technology
  • Acoustic Physics

Background:

  • Downhole applications require reliable real-time pressure monitoring.
  • Traditional sensors face challenges in harsh downhole environments.
  • Surface Acoustic Wave (SAW) devices offer potential for robust sensing.

Purpose of the Study:

  • To develop and characterize a passive SAW pressure sensor for downhole applications.
  • To evaluate the sensor's sensitivity, linearity, and suitability for harsh environments.
  • To validate experimental findings with analytical and numerical methods.

Main Methods:

  • Development of a passive SAW pressure sensor utilizing a SAW resonator and a metal diaphragm.
  • Measurement of sensor frequency response to applied pressure.
  • Validation of experimental data using hybrid analytical-numerical analysis.
  • Assessment of sensor design and packaging for harsh environments.

Main Results:

  • The SAW pressure sensor demonstrated a sensitivity of 8.3 kHz/bar.
  • High linearity was achieved, with a measured value of 0.999.
  • Experimental results were successfully validated by hybrid analytical-numerical analysis.
  • The sensor's robust design is suitable for harsh industrial conditions.

Conclusions:

  • The developed passive SAW pressure sensor is a promising technology for real-time downhole pressure monitoring.
  • The sensor exhibits excellent sensitivity and linearity.
  • Its robust design and packaging make it suitable for demanding industrial applications.