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Related Experiment Videos

An ultrasonic time-delay spectrometry system employing digital processing.

Paul M Gammell1, Subha Maruvada, Gerald R Harris

  • 1Food and Drug Administration, Center for Devices and Radiological Health, Silver Spring, MD 20993, USA. pgammell@ieee.org

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
|May 26, 2007
PubMed
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A new time-delay spectrometry (TDS) system was developed for ultrasonic applications. This modern system accurately calibrates hydrophones and measures material properties, offering an alternative to outdated equipment.

Area of Science:

  • Acoustics
  • Ultrasonic Measurement
  • Signal Processing

Background:

  • Time-delay spectrometry (TDS) is a valuable swept-frequency technique for ultrasonic applications.
  • Existing ultrasonic TDS research systems rely on discontinued commercial equipment.
  • Commercial TDS systems are limited to the audio frequency range.

Purpose of the Study:

  • To design and implement a new ultrasonic time-delay spectrometry (TDS) system using modern components and signal processing.
  • To demonstrate the system's capability for hydrophone calibration and material property measurements.
  • To provide a viable alternative to obsolete TDS research systems.

Main Methods:

  • A new TDS system was constructed using a linear frequency sweep source, audio filters, a mixer, a digitizer, and a personal computer.

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  • An optional implementation includes an oscillator and analog multiplier for frequency shifting.
  • Standard signal processing software was utilized for data analysis.

    • Main Results:

    • The new TDS system successfully performed substitution calibration of hydrophones.
    • Attenuation measurements were conducted on a tissue-mimicking material.
    • Results agreed within +/- 0.5 dB with a previous custom TDS system in the 1-10 MHz range.

    Conclusions:

    • The developed TDS system is effective for ultrasonic hydrophone calibration and material characterization.
    • The system offers a modern and accessible solution for ultrasonic research.
    • The system's frequency range can be extended with higher frequency transducers.