Underwater Acoustic Absorption Test Set

Underwater Acoustic Absorption Test Set

The Underwater Acoustic Absorption Test Set is an integrated measurement system designed to determine the sound absorption characteristics of materials submerged in water across a broad frequency range. It utilizes two complementary methods: an underwater impedance tube for low frequencies following ISO 10534-2 and ASTM E1050-12 standards, and a free-field measurement in an underwater anechoic tank for higher frequencies.

By measuring the standing wave interference patterns and computing complex transfer functions, the system calculates the absorption coefficient, reflection coefficient, and acoustic impedance with high accuracy.

The system consists of

  • Mechanical structures (impedance tube, sample holder, calibration tube)
  • Acoustic transducers (underwater projector, hydrophones)
  • Electronic modules (power amplifier, preamplifier, DAQ with signal generator)
  • Software for configuration, calibration, and data acquisition.
  • User Manual
Features
  • Measure absorption from 100 Hz to 120 kHz using impedance tube and free-field methods
  • Comply with ISO 10534-2 and ASTM E1050-12 standards
  • Apply two-microphone transfer-function method with three hydrophones
  • Use stainless steel impedance tube (Ø70 mm, 1000 mm length)
  • Integrate LF projector and high-frequency transducer for broadband excitation
  • Control setup via LabVIEW-based software with .csv export
  • Perform automated calibration with water-level control
  • Acquire data via 16-bit DAQ, 1.33 MS/s/ch, and integrated signal generator
  • Amplify signals with selectable gain (10-60 dB) and filters up to 600 kHz
  • Visualize transfer function, impedance, and absorption in real time
  • Fit precise sample sizes (Ø70-80 mm) with dedicated holder
  • Operate in 0-60 °C, 10-90% RH environments
  • Deliver comprehensive underwater acoustic evaluation across low to high frequency ranges, supporting diverse R&D and material testing needs
  • Enhance testing reliability and standardization through methods compliant with ISO and ASTM acoustic measurement standards
  • Simplify operation and reduce setup complexity with an integrated hardware-software system, automated calibration, and intuitive interface
  • Improve data quality and analysis efficiency with high-resolution acquisition, real-time visualization, and easy export for post-processing
  • Enable accurate assessment of sound-absorbing materials in controlled, repeatable laboratory conditions for product development and validation

Developing acoustic insulation and stealth coating compounds required a measurement system for characterizing sound absorption coefficient, reflection coefficient, and acoustic impedance of test samples.

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