Acoustic Bubble Spectrometer

About Acoustic Bubble Spectrometer

The Acoustic Bubble Spectrometer (ABS) is a system designed to measure the bubble size distribution in liquids using ultrasonic signals. Originally developed by Dynaflow Inc. (USA), this system enables precise and non-intrusive bubble measurement in various research applications.

Overview

Ultrasonic waves are highly sensitive to bubbles, allowing the ABS system to measure bubble size distribution without interference from solid particles in the liquid. Unlike optical methods, it does not require transparent fluids or containers, making it suitable for a wide range of environments.

The system operates on a Windows-based platform with an intuitive GUI, enabling easy operation without requiring advanced knowledge of complex analysis algorithms.

 Measurement Principle

• Uses two ultrasonic sensors (transmitter and receiver).
• A predefined signal is transmitted through the liquid.
• The system analyzes:
• Sound attenuation (u)
• Signal attenuation (v)
• Bubble size distribution is obtained by solving an inverse problem using parameters (u, v).
• Results include:
• Bubble diameter vs. number density distribution
• Real-time waveform visualization

A reference measurement (bubble-free condition) is required to establish baseline values.

Key Features

• Accurate measurement of bubble size distribution in liquids
• Unaffected by solid particles in the medium
• No requirement for optical transparency
• Real-time visualization of measurement results
• All data stored in binary format for post-processing
• User-friendly GUI-based operation

System Configuration

Standard ABS System

• Desktop computer (Windows OS)
• Signal generation board
• Data acquisition board (sampling rate: 10 MHz)
• Ultrasonic sensor set (1/2 inch, transmitter & receiver)
• Signal amplifier
• ABS measurement and analysis software (with 1-year support)
• Operation manuals (English & Japanese)

Optional Equipment

• Upgrade to notebook computer (at time of order)
• Various ultrasonic sensor sets
• Size range: 1/2 inch to 4 inches
• Available in square, cylindrical, and custom designs
• Bypass pipe system with built-in sensors
• Multi-hydrophone system (up to 3 sensor sets)

 Measurement Range

• Frequency Range: 10 kHz 220 kHz
• Bubble Radius: 5 m 500 m
  (Varies depending on sensor specifications)

Output Data

• Raw signal waveforms
• Parameters (u, v)
• Bubble size distribution
• Void fraction

Applications

• Cavitation testing (bubble nucleus measurement)
• Evaluation of microbubble generation systems
• Environmental bubble measurements
• Monitoring in water treatment systems