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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
 
Portable AE System
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 MISTRAS’ 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.
 
Brochure :
 
PCI Based Multichannel AE Board & System

There are two types of PCI based AE Multichannel Boards :
  • PCI Express-8 : 8-channel AE system
  • PCI-2 : 2-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 PCI-2 AE System on a card is a 2-channel data acquisition and digital signal processing system on a single full-size 32-bit PCI-Card.

Engineered to be low noise, the PCI-2 features 18 bit A/D and 40 MSample/second acquisition provides extremely high speed and high resolution data collection for research applications making it the idea board for small scale testing in universities and materials laboratories.

The wide bandwidth of 1kHz to 3 MHz allows the board to use the full potential of any MISTRAS AE sensor.
 
Brochure :
 
Wireless AE System
A versatile, multichannel field deployable AE instrument that uses lower power and wireless communication technologies, the 1284 enables economical, convenient and comprehensive on-line monitoring capabilities on a variety of industrial structures. The scalable system provides up to four channels of data acquisition as well as sensor fusion capabilities, allowing integration of AE data including six parametric inputs including one strain gauge. Its wireless communication features make it ideal for a variety of monitoring solutions by eliminating the need for long cables between AE system and sensor. Since it communicates with a station wirelessly, the AE system can run on battery power, from an energy harvester, or off a solar panel.
 
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AE Sensors

Physical Acoustics’ sensors are built to "listen" to high frequency signals. Much like a highly-sensitive “ear,” Acoustic Emission sensors interpret the material’s “voice” into usable AE waveforms. Additionally, AE sensors help understand how materials behave in their natural setting.

AE sensors are a vital link in determining how to apply remedial solutions and repairs to resolve structural issues. AE sensors are used to test storage tanks, heat exchangers, piping, reactors, aerial lift devices, as well as gas, petro-chemical and nuclear power plants.

Physical Acoustics’ sensors can be built with specific features to meet project or application specific needs.

Types of sensors :
  • Airborne
  • Differential
  • Flat frequency response
  • General purpose
  • High temperature
  • Integral preamp
  • Intrinsically safe
  • Low frequency
  • Medium frequency
  • Miniature
  • Rolling
  • Shear wave
  • Underground
  • Underwater
  • Very low noise
  • Wideband
 
VPAC II – THROUGH-VALVE LOSS CONTROL INSTRUMENT

The VPAC II can estimate the quantity of material leaking through the valve using the accompanying proprietary software. With hundreds of systems currently in use, the VPAC II is the instrument of choice for through valve leak detection.

Features of the VPAC II include:
  • Stores a reading, as well as upstream and downstream readings, for up to 100 valves at a time.
  • Loads a complete testing route with valve names & physical properties from VPACwin.
  • Calculates Leak rates directly on the unit.
  • Transfers all stored data to notebook or desktop PC with VPACwin software via a simple, wireless Bluetooth interface.
When used on gas systems, the VPAC II system is capable of detecting leaks as small as 1-liter per minute. This is because the sensor is virtually on top of the leak source and attenuation of the signal is not a factor. Counting for standard pressure and temperature (14.696 psia and 60° F), this corresponds to 2.12 SCF per hour.
 
Brochure :
USB AE Node
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
 
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