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High Definition Acoustic Camera

 

This solution is an extremely fast sound source localization method for both stationary and transient sound sources. It features a state-of-the-art beamforming method, complemented with advanced processing methods to improve spatial resolution and dynamic range, such as: near-field localization & quantification, far-field deconvolution, source separation for rotating sources & engine noise, advanced processing tools for windtunnel noise. Integrated in one application, and with the flexibility to support many different microphone arrays, this is an excellent solution for both large or awkward structures running in different operational conditions which require analysis in tight deadlines.

 

HD cam 2 LR.jpgWhen time is critical, only an extremely fast solution will do. This is why engineers count on the brand-new LMS Test.Lab High Definition Acoustic Camera solution.

It is an extremely fast sound source localization method for both stationary and non-stationary sounds. Featuring a beamforming technique that permits source localization from longer distances, it is an excellent solution for both large or awkward structures and tight deadlines.

The advantage of beamforming is that it provides spot-on localization of high frequencies. The spatial resolution (i.e. the localization precision) is inverse proportional to the frequency and distance. Since the LMS Test.Lab High Definition Acoustic Camera has been extended with close to the source or near-field focalization, the level of precision is doubled compared to traditional beamforming techniques – accounting for the “high definition” aspect of the acoustic camera. Traditional beamforming cannot be used close to the source; therefore the LMS Test.Lab High Definition Acoustic camera automatically applies a different focalization process for these types of measurements.

An option called irregular-NAH makes the processing of close-to-the-source measurements with nearfield acoustic holography (NAH) possible. Formerly, this required an array with even-spaced microphones. An adapted NAH formulation now allows near-field data measurement processing with the LMS Test.Lab High Definition Acoustic Camera. This offers clear advantages when localizing low-frequency sources and yields results with better spatial resolution. For mid and high frequency sources, near-field focalization remains the preferred technique.

The LMS Test.Lab High Definition Acoustic Camera solution includes a circular microphone array with a wide-angle camera for clear pictures of the full surface even at short distances from the source. The circular microphone array, available with a standard configuration of 36 or 54 microphones, also includes a laser that automatically measures the distance to the source.

The LMS Test.Lab High Definition Acoustic Camera solution provides accurate localization up to 20kHz. Analysis results and reporting can be executed in the time, frequency and order domain. The results can be documented using pictures as well as animated video. As part of the analysis process, it is also possible to listen to the identified hot spots.

To increase overall testing productivity, LMS also provides other techniques for sound source localization according to different required criteria such as frequency range, accuracy, cost and time pressure. The latest LMS sound intensity techniques include sound intensity (supporting pressure-pressure and pressure-velocity probes); high-definition acoustic cameras (a beam-forming solution combined with focalization) and acoustic holography (a holography solution combined with focalization).




Features

  • Unique LMS Test.Lab hardware and software for both far-field and near-field measurements
  • Uses beamforming, near-field focalization as well as irregular near-field acoustic holography techniques
  • Automatic distance-to-source measurement using built-in infra-red sensor
  • Animation of pressure as a function of time/frequency
  • Reporting includes pictures and video
  • Realtime snapshot/scope mode with possibility to take pictures

Benefits

  • Extremely quick results
  • Applicable for stationary and transient applications
  • Double-precision compared to tradition beam-forming solutions
  • High quality spatial resolution with irregular-NAH processing in low frequencies



    Covering a range of industries, LMS application cases let you discover how LMS solutions help our customers solve their real-life engineering challenges. 

    Engineers at International Automotive Components use the new LMS Test.Lab High Definition Acoustic Camera to identify noise sources in seconds

    International Automotive Center IAC.jpgEngineers at International Automotive Components (IAC) – the largest acoustic materials supplier to the automotive industry – use the new LMS Test.Lab High Definition Acoustic Camera to identify noise sources in seconds compared to hours and days needed with traditional methods. Using this tool, engineers gain deeper insight into acoustic behavior and shorten turnaround times in lowering interior car noise for automakers around the world. 




    Vibro-acoustic testing on the high seas


    CETENA.jpgCETENA Ship Research Center uses LMS Test.Lab for a variety of standard – and not so standard maritime equipment testing. Everything from worst case scenario shock tests to the acoustic resonant frequency of a Murano chandelier on a mega-cruise ship is subject to the expert scrutiny of the CETENA testing team in Genoa, Italy. And this team counts on the powerful LMS testing solutions that can deliver results in minutes instead of days as billion-euro projects hang in the balance.



    Acoustic Holography, Noise Source Identification and Quantification

    acoustic holography noise source identification quantificationLMS Acoustic Holography performs a spatial transformation of sound fields – meaning that it takes a measurement of sound pressures along a certain plane and predicts what the readings would be anywhere else. This can be towards the nominal source (back propagation), towards the far field, or in any other direction or plane. Special techniques are available when working in complex multisource environments. Acoustic Holography is a powerful tool that helps to solve noise source identification and quantification problems.



    Acoustic beamforming

    acoustic-beamforming-c.gifFinding out the exact source of a sound is a tough challenge for any acoustics engineer. Since the early 90’s, a number of methods, based on microphone arrays, have matured and are used throughout numerous industries. In general, the methods fall into three categories: near-field acoustic holography, acoustic beamforming, and inverse methods. Depending on the test object, the nature of the sound and the actual environment, engineers will have to select one method or the other. What that means for the Beamforming technique used as an acoustic camera is described in more detail below. Find out more!




    Images

    High Definition Acoustic Camera LR 02.jpg HD cam 1 LR.jpg High Definition Acoustic Camera LR 04.jpg
    LMS Test.Lab High Definition Acoustic Camera uses unique, innovative yet robust processing. A complete and integrated solution: multi-channel array, hardware and software platform for acquisition, interactive analysis and multimedia reporting. State-of-the art algorithms provide precise localization of multiple sources with different levels over the entire surface.


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