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Acoustic Emission
 
With Acoustic Emission, you can "listen" to the sounds of cracks growing, fibers breaking and many other modes of active damage in stressed materials.

Acoustic Emission (AE) testing is a powerful method for examining behavior of materials deforming under stress. 

The Acoustic Emission NDT technique is based on the detection and conversion of high frequency elastic waves to electrical signals. This is accomplished by directly coupling piezoelectric transducers on the surface of the structure under test and loading the structure. Sensors are coupled to the structure and the output of each piezoelectric sensor (during structure loading) is amplified through a low-noise preamplifier, filtered to remove any extraneous noise and furthered processed by suitable electronic equipment. 

The instrumentation of Acoustic Emission must provide some measure of the total quantity of detected emission for correlation with time and/or load.

   
AE is the short rapid, release of energy in the form of a transient elastic wave.

The Acoustic Emission source is created by a defect (crack) or discontinuity (e.g. high tension wire break) that becomes active due to changes in operating loads, overloading conditions or degradation of the material in (e.g. stress corrosion cracking, corrosion fatigue & hydrogen embrittlement).

The Acoustic Emission waveform has several parameters that can be used for characterization of the source defect or discontinuity.

Small-scale damage is detectable long before failure, so AE can be used as a non-destructive technique to find defects during structural proof tests and plant operation. AE also offers unique capabilities for materials research and development in the laboratory. Finally, AE equipment is adaptable to many forms of production testing, including weld monitoring and leak detection.

  • Acoustic Emission In Field Testing
  • Global Monitoring - 100% Inspection of the Structure
  • Testing with Insulation/High-Temperature Processes
  • On-line Testing
  • Rapid Inspection & cost Reduction
  • Permanent Recording of Test & Defect Location
Applications of Acoustic Emission
  • Behavior of Materials (metals, ceramics, composites, rocks, concrete):
    Crack propagation, Yielding, Fatigue, Corrosion, Stress corrosion, Creep, Fiber fracture, delamination.

  • Nondestructive Testing During Manufacturing Processes:
    Material processing, Phase transformation in metals and alloys (martensitic transformation), Detection of defects such as pores, quenching cracks, inclusions, etc., Fabrication, Deforming processes; rolling, forging, extruding, Welding and brazing; detects detection (inclusions, cracks, lack of penetration), TIG, MIG, spot, electron beam, etc., Weld monitoring for process control

  • Monitoring Structures:
    Continuous monitoring (metallic structures, mines, etc.), Periodic testing (pressure vessels, pipelines, bridges, cables), Loose Part Detection, Leak Detection

  • Applications :

    Laboratory & R&D studies, In field inspection, Structural integrity evaluation, Vessels testing [ambient, hot or cryogenic, metallic and FRP, spheres], Tank bottom testing, Nuclear components inspection (valves, lift beams, steam lines), Corrosion detection, Pipeline testing, Transformers testing (Partial Discharge), Railroad tank car testing, Tube trailers & high pressure gas cylinders, Reactor & high energy piping testing, Aging aircraft evaluation, Advanced materials testing (composites, ceramics), Production quality control, Rocket motor testing

  • Other Special Applications:
    (Petro) Chemical: storage tanks, reactor vessels, offshore, drill pipe, pipelines, valves, hydro-treaters.
    Power: nuclear reactors, piping, steam generators, ceramic insulators, transformers, aerial devices.
    Aircraft and aerospace: fatigue cracks, corrosion, composite structures, etc.
    Electronics: loose particles in electronic components, bonding, substrate cracking.
Other Products
 
POCKET A E
A high performance, dual-channel Acoustic Emission system packed in a rugged, portable handheld unit optimal for use as a field survey tool. The Pocket AE offers all the performance, capabilities and features of a larger, more expensive AE system (wide bandwidth, speed, AE features, sampling rates, waveform processing, audible AE) in a compact, battery-operated package. Ideal for situations when power is not readily available; the Pocket AE is equally useful in the laboratory with two-channel capabilities and 1 channel parametric input. Its portability and versatile features make it ideal for leak detection, material and processes characterization, and screening for more detailed follow-up inspection.
  • Compact Flash card and USB port for data transfer to laptop or desktop PC.
  • Hand-held portability for quick, efficient testing in the field or laboratory.
  • PDA type computer using Microsoft™ Windows-CE™ compact operating system, familiar and easy to use.
  • Utilizes PAC standard low cost passive AE low power sensors with an internal AE preamplifier.
  • Two AE channels with one high performance 18 bit A/D for each channel, allowing AE data processing at up to 10 MSPS.
  • 16 bit A/D waveform capture and AE signal processing offers wide system dynamic range without the need for gain controls.
  • 16 bit A/D parametric input to correlate AE to other process sensors.
  • Integrated rechargeable battery package lasting 4 hours (continuous) or more. Batteries are easily changed and can be charged outside of the system (with optional charger).
  • • Numerical keyboard with function keys for quick, easy setup and control with internal flash memory for storing setups and data files.
  • Permanent digital record of the test results in standard DTA, PAC data files, compatible with AEwinTM Software for detailed data analysis and data visualization.
 
Brochure :
 
MULTICHANNEL AE
Physical Acoustics offers a complete multichannel product line, ranging from products with two channels, to units with multi-hundred AE channels. Systems can be synchronized to each other to accommodate an expanded number of channels.

Our multichannel product's capabilities allow users to simultaneously monitor and record AE frequencies. Multichannel products incorporate specialized AE boards, designed to accommodate use of multiple AE sensors, for more comprehensive analysis of the asset.


EXPRESS-8 – PCI EXPRESS-BASED EIGHT-CHANNEL AE BOARD & SYSTEM

The Express-8 is a high-speed, 8-channel AE system on a board, based on the PCI-Express bus architecture. By utilizing PCI-Express, the latest standard for PC computer expansion cards, high maximum sustained processing speeds are achieved, with performance maintained even after system expansion.

In addition to its high performance data transfer and processing rates, the Express-8 offers high channel density. At 6.5” long, it is half the size of a full-sized PCI board. This small form factor allows more AE channels to be installed in a single system. In fact, with Physical Acoustics’ Industrial Express chassis, a single AE system can be configured with up to 96 channels inside a single chassis.

The board contains 8 analog parametric input channels with a +/-10V range and 10 kSPS sample rate on all channels. It includes built-in waveforms, waveform streaming and processing, and offers more than 500 selectable digital filters for sharp cutoffs and lower noise. It is compatible with all Physical Acoustics preamplifiers.
  • High-performance PCI-Express bus allows for greater data streaming speed
  • Half the size of previous models, allowing for greater channel density in chassis
  • High channel density (8 channels)
  • Waveforms and Waveform Streaming included
  • More than 500 selectable digital filters for sharp cutoffs and lower noise
  • Compatible with all MISTRAS preamplifiers
  • EXPRESS-8 chassis - Micro-II-Express (32 channels) and Benchtop (96 channels)
  • Optional chassis expansion interface
  • Improved digital filers, larger hit buffer, larger waveform FIFO buffer
  • Sensor input: PK sensor, low power phantom power +5V, or RXXI and preamplifier, traditional phantom power (+28V) or 24v ICP Sensor
 
Brochure :
 
AE WIN
AEwin is a Windows-based program for real-time simultaneous Acoustic Emission (AE) feature and waveform processing, display, fast storage, and replay. It is used for true, real-time operation and control with your MISTRAS AE Systems (Express-8, PCI2, SAMOS, SH II, SH III, AE USB Node, and Wireless AE Node). AEwin™ is easy to learn, operate and use. The software has all the acquisition, graphing and analysis capabilities that customers have come to expect in an AE system, plus many more features to ease your data analysis and visualization tasks.

AEwin offers highly flexible AE display and analysis, with exceptional 2D and 3D graphing and manipulation capabilities, and a framework for easily creating and customizing graph display. Graph types include 2D histograms, line plots and point plots, 3D graphs, waveforms, FFTs, and multiple plots on a single graph with coloring options. All graphs can be infinitely zoomed, maximized to full screen, and offer cursor readout capability, allowing for close-up data analysis. Additionally, AEwin™ includes enhanced processing features such as Hit-Event Linking and built-in filtering functions (both graphical filters and Post Filtering).
 
Brochure :
WIRELESS MULTICHANNEL AE

The 1284 Wireless Multichannel AE Node is a scalable Acoustic Emission (AE) instrument with sensor fusion capabilities, allowing integration of AE data and up to six parametric inputs including one strain gauge. The system was originally designed for bridge and civil infrastructure applications, but its scalability and modularity are suitable for a variety monitoring applications such as: storage tanks, vessels, aircraft, turbines and more.

Applications :
  • Continuous storage tank monitoring
  • Leak monitoring in different vessel types
  • Continuous monitoring of aircraft composite structures during flight
  • Monitoring of critical regions on wind turbine blades during operation
  • Bridge health monitoring
Instrument Characteristics :
  • Compatible with batteries and alternative energy sources
  • Low power consumption thanks to Field Programmable Gate Array (FPGA) design
  • Wireless data transmission using 900 MHz RF module, allowing maximum reach and minimum power consumption
  • Fusion of up to 11 sensor platforms including a single strain gauge, 4 AE channels and 6 parametrics
  • Easily deployable, given its small size and wireless transmission to a base station using ISM RF band
  • Internal storage via SD card
  • User defined data filtering options that combine AE features and system parameters
  • Customized alarms provide instant notification and data transfer upon reaching user-defined damage thresholds
  • Power saving options based on parametric data collected
  • Automatic probe recognition & frequency spectrum.
  • The A-scan display shows the echo curve
    The high-resolution A-scan of the ultrasound signal is especially useful with material that is difficult to measure in terms of sound properties.
  • Travel time controls gain.
  • High measuring rate
    The high measuring rate of up to 100 Hz ensures detection also of small defects when dynamic material scanning is applied.
  • Memory and statistics evaluation
    Readings and instrument configuration may be stored conveniently in files and transferred to a computer. The statistics evaluation provides minimum and maximum values, mean and standard deviation.
 
Brochure :
USB ACOUSTIC EMISSION
The 1283 USB AE Node is a full-featured, low-cost Acoustic Emission system that plugs conveniently into and is powered by the USB port of a user’s PC or laptop to maximize portability and versatility. While the system possesses all the features, capabilities and performance of a larger, standalone chassis, users also get the benefits of a USB connection – which means portability and connectivity whether you’re in the field or the lab. A single channel system in its base model can be expanded to four channels while accepting various sensors (single ended or differential) amplified by an internal low-noise preamplifier. This easily interfaces to a notebook or PC running Windows and MISTRAS’ renowned AEwin.

Features :
  • Powered and operated through USB Port
  • Rugged surface mount (SMT) construction
  • Built-in internal preamplifier and power for external preamplifiers
  • 18 bit resolution, 20MHz sampling frequency
  • With analog and programmable digital filters
  • Waveform and Location Options
  • Free LabView/C++ driver available for customer program development
 
Brochure :
VPA C II - Acoustic Leak Detection & Quantification for Through Valve Leakage

For over 20 years, the VPAC™ has been the industry standard for through-valve leak detection and quantification. MISTRAS/Physical Acoustics has dedicated the last several years to improving the electronics and software of the VPAC.

The VPAC™ II is available as an intrinsically safe or non intrinsically safe design. The digital AE leak detector includes several improvements that are now possible with new technological advancements.

The user interface is simple and intuitive, and the unit retains all settings even when powered down. The instrument is powered by four AA Nickel Metal Hydride batteries which will last several weeks in typical use. Battery replacement is quick and easy, so downtime is minimized.


Features:
  • Large Custom LCD Display w/ backlight
  • Dual Frequency range selection
  • Accepts D9203-IS, DS241-IS or VS9203 type sensors
  • User replaceable AA batteries
  • Small rugged ergonomic package
  • Simple, intuitive user interface via a 3x3 large button keypad
  • Headset-enabled
  • With few simple mouse clicks, you can connect to your VPAC II™ via Bluetooth and transfer data to and from the unit
  • Automatically loads and formats all data transferred from VPAC™ into userfriendly spreadsheet
  • Leak rates and total monetary loss per valve per year are calculated
  • Route Management features enable the user to load a specific set of valves to be tested onto the unit
  • Entire databases of valves can be created and saved for future use
  • Saved results over time can be used for trending purposes
  • Save, load, print, & modify values in leak rate calculation spreadsheets
  • Firmware upgrades, when available, supported over a Bluetooth interface
 
Brochure :
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