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Related Concept Videos

Equipments Used To Measure Blood Pressure01:30

Equipments Used To Measure Blood Pressure

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Direct Method
This invasive approach involves cannulating a peripheral artery. During each cardiac contraction, pressure generates mechanical motion within the catheter, transmitted through rigid, fluid-filled tubing to a transducer. This transducer converts mechanical motion into electrical signals displayed as waveforms on a monitor. An automatic flushing system prevents blood backflow. Due to the potential risk of unexpected arterial blood loss, this method is primarily used in intensive...
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To obtain accurate blood pressure measurements in clinical settings, especially when traditional methods are insufficient, healthcare professionals utilize the Doppler ultrasound technique. This method uses high-frequency sound waves to detect blood flow within the arteries, which is crucial for patients with conditions that complicate circulatory system assessment.
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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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The intensity of sound waves can be related to displacement and pressure amplitudes by using their wave expressions and the definition of intensity. The critical step to achieve this is to write the power delivered by the particles on the wave as the product of force and velocity and simplify the force per unit area as the pressure. The velocity of the medium's particles can be derived from the displacement.
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Assessing blood pressure is a standard procedure executed in virtually all medical environments. The method utilized today was established over a hundred years ago by an innovative Russian doctor, Dr. Nikolai Korotkoff. The soft ticking noise, known as Korotkoff sounds, heard while taking blood pressure readings results from turbulent blood flow within the vessels. The apparatus required for this procedure includes a sphygmomanometer, a blood pressure cuff attached to a gauge, and a...
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Fluid pressure is commonly measured using devices called manometers, which rely on liquid columns to indicate pressure differences. The height of a liquid column in a manometer reflects the pressure exerted by the fluid, providing a simple yet effective means of measurement. Different types of manometers serve specific purposes based on their configurations and the type of fluids involved.
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Diamond-based HBAR as a high-pressure sensor.

B P Sorokin1, N O Asafiev1, D A Ovsyannikov2

  • 1Technological Institute for Superhard and Novel Carbon Materials, 108840 Moscow, Troitsk, Russian Federation; Moscow Institute of Physics and Technology, 141700 Dolgoprudny, Russian Federation.

Ultrasonics
|June 19, 2024
PubMed
Summary
This summary is machine-generated.

A novel High-overtone Bulk Acoustic Resonator (HBAR) integrated with a Diamond Anvil Cell (DAC) functions as a sensitive high-pressure sensor. This acoustoelectronic sensor demonstrates superior performance and sensitivity for pressure measurements up to 30 GPa.

Keywords:
Aluminum-scandium nitrideDiamond Anvil CellHigh-pressure sensorMicrowave High-overtone Bulk Acoustic Resonator

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Acoustics

Background:

  • High-pressure research requires accurate and sensitive measurement tools.
  • Existing pressure sensors have limitations in performance and sensitivity.
  • High-overtone Bulk Acoustic Resonators (HBARs) offer potential for novel sensing applications.

Purpose of the Study:

  • To develop and evaluate an integrated measurement system using an HBAR as a high-pressure sensor.
  • To investigate the feasibility of using a specific HBAR configuration within a Diamond Anvil Cell (DAC).
  • To calibrate the HBAR sensor using established high-pressure calibration methods.

Main Methods:

  • Development of an integrated system combining a DAC and an HBAR operating in the microwave frequency band (1.3–3.7 GHz).
  • Fabrication of a specific HBAR configuration: "Al/ASN/Mo/(100) diamond".
  • Calibration of the HBAR sensor using two independent methods: diamond Raman line shift and ruby R1 luminescence line shift.

Main Results:

  • A stable correlation was established between HBAR frequency shifts and applied pressure (0–30 GPa).
  • The sensitivity of the HBAR sensor was determined to be 4.8 × 10-4 GPa-1.
  • The developed sensor demonstrated superior performance and sensitivity compared to existing methods in the 0–5 GPa range.

Conclusions:

  • The integrated HBAR-DAC system is a viable and effective high-pressure sensor.
  • The proposed HBAR configuration exhibits high sensitivity and stable performance.
  • This acoustoelectronic sensor offers significant advantages for high-pressure measurements, particularly in the lower GPa range.