Leak Detection and Monitoring System
Using Acoustic Wave (Acoustic Emission)

  • System
  • Principle
  • Data Analysis
  • Case Study

The leak detection and monitoring system uses acoustic wave (acoustic emission) technology to detect, analyze and monitor the status and locations of leaks so that users obtain real-time status of the measured equipment and early warnings of leakages if happens in order to prevent property losses or catastrophes.

The leak monitoring system is suitable for various sealed equipment and applications including:

  • Valve leak detection and monitoring
  • Pipeline leak detection system
  • Pressure vessel detection system and monitoring
  • Storage tank monitoring
  • Boilers
  • Heat exchangers
  • Pumps
  • Vacuum systems, etc.

regardless of whether the internal medium is liquid or gas or mixture of both.

Products for Leak Detection & Monitoring


SVLD1 is a handheld valve leak detector using acoustic emission testing.

  • Lightweight and portable
  • Powered by two AA batteries
  • Easy hands-on operation: couple on the surface and start measuring the leaks


RAEM2 is the IoT-AE wireless all-in-one monitoring system.

  • Sensor, processor, communication and battery built-in, ready to use
  • Time triggering and power saving for long term usage
  • Wireless remote automatic operations
  • Suitable for unattended leakage monitoring


Multi-channel testing or monitoring system

  • Multiple sensors networking to locate the accurate leak locations
  • Suitable for precise localization for leakage testing or monitoring


The fluid stored in sealed equipment leaks outward through the leakage hole due to pressure difference. During the process of fluid spraying outward, mechanical waves are generated and transmitted outward due to turbulence, friction, liquid gasification, and solid particle collision, which is the phenomenon of leakage producing acoustic waves, also known as the generalized acoustic emission phenomenon. This method detects leaks in sealed equipment and determines the location of leaks by collecting and analyzing acoustic emission signals.

During the leakage process, the transient changes in pressure fluctuations near the leakage point are different, and the resulting acoustic emission signals have a wide spectral range.

Display & Analysis

1) Cloud Platform for RAEM

Qingcheng IOT Cloud Platform, Alibaba Cloud, AWS and more platforms are available to use as the data terminal for display, storage and analysis. Below lists the QingCheng IoT Cloud Platform features as examples:

  • Real-time AE parameters and waveform displays
  • Remote control and configure the devices
  • Historical data storage and downloads
  • Remote system firmware upgrade
  • Parameter values rating to trigger alarm notifications for abnormal activities

2) SWAE software for SAEU3H/RAEM1-6

The SAEU3H or RAEM1-6 system can use the SWAE analysis software to analyze the real-time data and also for post data analysis.

  • Various views and analytical functions, location analysis, correlation graph analysis, waveform analysis, Fast Fourier Transform, wavelet transform and more;
  • Data storage and exportable to other formats for third party analysis.

Linear location (Time difference algorithm)

Leak waveform in time domain

Several Parameters verse time correlation graphs

3) Smartphone App using Bluetooth for RAEM2

  • Real-time parameters and waveform display
  • Historical waveform and parameter query (parameters are amplitude, average signal level (ASL), energy, RMS; the display time accuracy is in minutes)
  • Device control and configurations

(1)Pipeline monitoring of CETIM power station in France

Long-term arrangement of pipelines in power stations, unattended, linear leakage positioning of long pipelines, monitoring of rock falls and other accidental violations. The generated parameter rating results and other data content are pushed to the mobile phone to monitor whether the pipeline leaks in real time.

(2)Quantitative detection and monitoring of leakage in pipeline of a submersible company

No. Leak rate (mL/h) Amp (dB) Energy (Kpj) RMS (mV) RMS (mV)
1 0 26.6-30 0-1 0.007-0.023 14-25
2 42000 46-51 9-22 0.055-0.085 33-37
3 64000 54-56 65-75 0.14-0.16 41-43
4 310000 68-72 2500-3200 0.95-1.05 57-58
5 540000 76-79 11000-13000 1.9-2.1 64-65
6 650000 85-90 120000-140000 6.5-7.5 74-76

(3)Quantitative detection and monitoring of leakage in water pipes of a company

The relationship between leakage rate and ASL is shown in the following table: faucet leakage rate calibration.

Valves Leakage Testing Experiment using Acoustic Emission Technology image10

Valves Leakage Testing Experiment using Acoustic Emission Technology image11

The instrument integrates built-in communication module, battery, it can upload the alarm signal to the cloud server, and push signals to the mobile phone

Valves Leakage Testing Experiment using Acoustic Emission Technology image12

Valves Leakage Testing Experiment using Acoustic Emission Technology image14

Valves Leakage Testing Experiment using Acoustic Emission Technology image15

(4)Leak monitoring of pipeline experimental station in APC company

Valves Leakage Testing Experiment using Acoustic Emission Technology image12


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