acoustic camera Articles

  • Acoustic camera and beampattern

    Abstract—The wavenumber-frequency response of an array describes the response to an arbitrary plane wave both in time and space. When the input consists of a single monochromatic plane wave, the response of the array is referred to as the array pattern or beampattern. Through the design of the array our goal is to have a directivity of the array as high as possible in a given direction, ...


    By Norsonic AS

  • Case study - Nor848A Acoustic Camera Metro station in Taipei, Taiwan

    After the construction of the elevated sky train, too high noise levels were appearing under the line and local communities were complaining. Therefore acoustic absorbing panels were mounted under the metro line at critical sites in order to reduce noise emission. To document the effect of the absorbers a Norsonic Nor848A 1.0 meter acoustic camera was setup for recording and reporting on the ...


    By Norsonic AS

  • Case study - Filming low-frequency structure born noise with acoustic camera

    Problem An apartment complex consists of five floors, with several apartments over four floors, and an attic on the top floor. In the attic an air circulation system is installed to provide circulation in the bathroms of all the apartments in the building. The circulation system is driven by an air fan distributing air through pipes going to all apartments. The air pipes are cemented in ...


    By Norsonic AS

  • Case study - Wall leakage testing in the lab with acoustic camera

    Problem Facade insulation testing is usually performed by using a loudspeaker in the sending room, and record the sound pressure level (SPL) with microphones in both the sending and receiving room. The difference in SPL adjusted for the size of the dividing wall element will then give an estimate of the sound reduction quality of that element. However these measurements will not say ...


    By Norsonic AS

  • Case study - Use of the Nor848A acoustic camera on wind turbines

    The acoustic camera system Nor848 is a powerful tool to investigate noise sources. In realtime you listen to a beamformed audio signal so that you can hear individual sources one by one. Immediately you can identify the strongest over all noise source in a multisource environment, and you can do the same analysis for single frequencies, 1/3 or 1/1 octave bands or any given frequency range. This ...


    By Norsonic AS

  • Case study - Using acoustic camera inside caravan car to find squeak and rattle noise

    Problem When driving a caravan car, the driver could hear annoying noises from behind the driver’s cab in the living compartment. Even though the noises could be heard clearly, it was very difficult to discover the exact location and cause of the various annoying sounds due to overwhelming background noise. When the car was standing still with the engine running, no extra ...


    By Norsonic AS

  • Case study - Finding acoustical weak points in room dividing modular walls

    Problem A conference hotel is using modular walls to divide large halls into several smaller conference rooms. The rooms are divided by modular walls that provide several different opportunities for subdivision and multipurpose use of the large area spaces. When measuring the sound insulation between adjacent rooms through the modular walls, the resulting value was found to be too ...


    By Norsonic AS

  • Case study - Pinpointing low level sanitary noise in apartment building

    Problem A newly built apartment building consists of several floors with multiple apartments on each floor. One of the ground floor apartments is disturbed by sanitary noise from the apartment above, which is heard whenever the toilets in the top apartment are being flushed. The sanitary noise is heard in several rooms, and the level was measured to be around 30 to 35 dB, which is above ...


    By Norsonic AS

  • Case study - Identifying low-frequency tonal noise in windy and noisy conditions

    Problem A large LNG gas facility (approximately 300m x 150m) producing 300 000 tons of LNG annually is situated in a terminal area with the nearest populated area at a distance of around 1 km. Within the gas production facility, a low-frequency tonal noise at around 500 Hz is generated causing complaints from nearby neighbours. The tone imposes a more stringent noise requirement on the ...


    By Norsonic AS

  • Case study - Filming sound leakages in highly reflective office environment

    Problem A newly built office complex is designed with glass facades between the offices and the hallway. The glass facades include a glass door. Although the glass structures themselves have a sufficient sound reduction value, the sound insulation between office and hallway was measured at 19 dB, which was far below the sound insulation criteria for offices given in the regulations. It ...


    By Norsonic AS

  • Case Study - Siemens Industrial Turbomachinery AB

    Problem Two large gas turbines (approximately 25m x 12m x 10m) were installed in an industrial area nearby an office building. The gas turbines generate a tonal noise component at around 2700Hz caused by the inlet channel blades pass frequency. This tone imposes a more stringent noise requirement on the supplier, forcing noise reducing actions being made on the turbine. ...


    By Norsonic AS

  • For Malaysia Water Operator, NRW Leak Detection Program Recognized As Major Success

    At Singapore International Water Week 2016, one of Pure's licencees presented a poster on two acoustic-based technologies (tethered Sahara® and free-swimming SmartBall®) used to locate 674 ...


    By Pure Technologies

  • Case study - City of Rockville - Robotic Pipeline Inspection

    Service: PureRobotics - Robotic Pipeline Inspection Client: City of Rockville Project Date: July 2010 Type of Pipeline: Water Transmission Main Diameter: 24-inch Pipe Material: PCCP Length: 53,000 feet Results: 3 pipe sections identified at risk Insertion of Pipeline Inspection Robot Pure Technologies (Pure) was contracted to provide robotic pipeline inspection ...


    By Pure Technologies

  • Low-noise Parking at Madrid Airport

    With over 34 million passengers, and handling over 360 000 flights annually, Madrid Barajas Airport, Spain is the fifth largest airport in Europe. It is owned by AENA (Aeropuertos Espaoles y Navegacin Area), who manage over 60 airports throughout Spain and Latin America and handle over 160 million passengers each year. On experiencing a growing number of complaints from the neighbouring ...

  • Case study - Measuring impact of traffic noise in apartment living room

    Problem An apartment on the ground floor of a two story house in the city lies close to a busy road. The living room in the apartment is facing the road, and the inhabitants are bothered by traffic noise, especially in the morning and the afternoon, when the traffic is the heaviest. Traffic noise could be clearly heard when standing in the living room. The facade facing the city ...


    By Norsonic AS

  • Case study - Filming breakout noise from café and concert venue

    Problem A combined bar, bistro and concert venue in the city center has been renovated with a great emphasis on acoustic noise dampening. Nevertheless, the venue is still getting complaints from neighbours close by due to breakout noise from the location, especially during late night concerts. The establishment consists of a bar and bistro on the ground floor, with the concert venue on ...


    By Norsonic AS

  • 50th anniversary of world`s first sound level meter

    Sound Level Meter Celebrates 50th Anniversary 2010 is the year we celebrate the 50th anniversary of Type 2203, the mother of all sound level meters. It was the world’s first precision hand-held and transitorised sound level meter. Produced for 21 years, it sold a record number of 17300 units. With its upgrades Type 2204 (Impulse time constant) and 2209 (peak detector), it accounted for a ...

  • City Of Vancouver Deploys Free-Swimming Tools For Successful Inline Inspection Of Pressurized Main

    With its Pacific Ocean entranceway and towering backdrop of snow-dusted mountains, it’s no wonder the City of Vancouver ranks among the most laid-back, beautiful cities in Canada, and indeed, the world. Water is in its blood. This spring the coastal seaport city retained the services of ...


    By Pure Technologies

  • Acoustiblok® Quiets Well Motor Noise for California Water District

    Acoustiblok recently resolved a noisy well motor issue that was affecting some nearby residents for Three Valleys Municipal Water District (Three Valleys MWD) in California. Ben Peralta, a Three Valleys MWD engineer working on the project said, “The new Acoustiblok All Weather Sound Panels perform better than the old ...


    By Acoustiblok International

  • Case study - Washington Suburban Sanitary Commission

    After WSSC began experiencing major PCCP failures in the 1970s, it developed a strong commitment to infrastructure management technology in favor of large capital replacements. Beginning in 2007, WSSC and Pure Technologies began a partnership to create a comprehensive PCCP management program. The Washington Suburban Sanitary Commission (WSSC) is the 8th largest water and wastewater utility in ...


    By Pure Technologies

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