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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

Benefits

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

Software