acoustic calibrator Articles

  • On the right track

    High-speed train manufacturer, CAF, rely on world-class beamforming technology to reduce the noise generated by their trains – helping to make high-speed trains a more viable option for travellers and operators alike. Because of its relatively low levels of CO2 emissions, train travel is considered one of the ...

  • Enhanced acoustic material testing in a tube

    Demands from the Industry   A growing number of customers demand quieter vehicle cabins, and cabin acoustic comfort has become a major concern for the automotive industry. Optimization of the acoustic insulation performance has, therefore, been given a more prevalent role in the design process. In the aircraft industry, acoustic comfort for customers and the use of new, lighter ...

  • Fine-tuning acoustic isolation in buildings

    ACCIONA Infrastructure is ranked among the leading construction companies in the world - and is recognised for implementing the most advanced and innovative technology.  As research and design is vital to keep the company at the cutting edge in relation to technological developments, ACCIONA Infrastructure created a team to analyse noise and vibration. Where traditional ...

  • Calibration – the sure way to accurate measurements

    Calibration   During testing, microphones and accelerometers can change sensitivity or break. They might look intact, but what happens if you continue measuring without having calibrated your transducer? Can you trust your data? Do you have to redo the entire test? In cases of extreme testing you might only have one shot at getting your measurement right as the product gets ...

  • Short-term noise monitoring with Delta Acoustics case study

    Noise monitoring does not require a large amount of expertise or investment in expensive equipment. DELTA learned how measurement projects with high technology demands could easily be solved with a Noise Sentinel On Demand subscription. Challenge Demands for quick calculation validations on noise measurements that had to comply with strict ISO regulations ...

  • Impact of sound attenuation by suspended sediment on ADCP backscatter calibrations

    Abstract. Although designed for velocity measurements, acoustic Doppler current profilers (ADCPs) are widely being used to monitor suspended particulate matter in rivers and in marine environments. To quantify mass concentrations of suspended matter, ADCP backscatter is generally calibrated with in situ measurements. ADCP backscatter calibrations are often highly site-specific and season ...


    By Teledyne RD Instruments

  • How Often You Should Calibrate A Sound Level Meter

    Do you calibrate a sound level meter frequently? Most sound level meter users know they must calibrate their sound level meters but a questions I frequently get asked if “how often?” Here’s my best practice advice so you can calibrate with confidence. What Do We Mean by Sound Level Meter ...


    By Cirrus Research plc

  • Calibration of a 2-D morphodynamic model using water–sediment flux maps derived from an ADCP recording

    This study compared numerical simulations of the hydro-morphodynamics of a stretch of the Po River (Italy) to detailed measurements of the river's morphology and water–sediment fluxes. A survey of the 8-km-long, 250-m-wide river section, previously described in former publications, was performed using two vessels. The first was equipped with a multibeam echo sounder for bathymetry ...


    By IWA Publishing

  • INTA – exterior noise certification of Airbus A330 MRTT

    INTA is a Public Research Body specialising in aeronautic and space research and technological development. It owns a multitude of Brüel & Kjær products including a 30-channel PULSE system and a 6-channel LAN-XI system which are used daily. One of the latest and most important jobs performed by INTA is the Noise Certification of Airbus Military’s A330 MRTT which it achieved ...

  • Noise Monitors and Meters

    Sound level meters Description and ApplicationsThe sound level meter is a lightweight instrument for the measurement of sound pressure level (SPL) in decibels. All ANSI-approved meters meet minimum requirements that include an A-weighted network, a slow-response meter characteristic, and a fully graduated scale with measurements ranging from 80 to 130 dBA. The Type II meter is most frequently ...

  • Buying Noise Measurement Equipment: how to cut costs, not quality

    At a time when budgets are under strain, the Pulsar Model 14, ultra-simple digital sound level meter offers a compliant, reliable, yet affordable noise meter. It is the preferred choice of employers looking for a meter for general purpose use whilst meeting the “Noise at Work” Regulations and the requirements of IEC 61672 to Class 2.  The ...


    By Pulsar Instruments plc

  • How the LISST-ABS works

    INTRODUCTION: Sequoia’s Acoustic Backscatter Sensor, LISST-ABS is designed to measure suspended sediment concentration at a point. Unlike ADCP’s which may record similar backscatter strength at multiple points along the acoustic beams (‘ranges’), the LISST-ABS  only reports backscatter signal strength at a single point about 5 cm from the transducer. The ...


    By Sequoia Scientific, Inc.

  • Integrate noise measurements into your existing Process Monitoring and Control Systems.

    The ZE:908 is a small and lightweight power supply and acoustic conditioning unit for the Cirrus MV:200 microphone preamplifiers and MK:170 Outdoor microphone units. Many industrial plants have a variety of process sensors strategically placed around their site so that safety, environmental impact and efficiency can be monitored and managed, in real time, from one or more control rooms. The ...


    By Cirrus Environmental

  • Putting the surface microphone through its paces at Airbus

    Thirty-odd years later, the A380 – the widest commercial airliner available today with seating for 525 passengers – will be entering into service. It is another testament to Airbus’ commitment to innovation and intelligent design. Therefore, Airbus came to Brüel & Kjær for the development of a transducer they could invariably use to measure sound pressure in ...

  • Case study - Plains Midstream– Alberta, Canada

    Service: SmartBall - Oil Leak Detection Client: Plains Midstream Canada Project Date: May 2008 Type of Pipeline: Crude Diameter: 8-inch Length: 8,000 meters Results: 2 simulated leaks created and detected As small as 0.0025gals/min Plains Midstream selected SmartBall ahead of other technologies for their pipeline leak ...


    By Pure Technologies

  • Borehole logging case study

    Corozal, Puerto Rico GeoView was tasked to conduct borehole geophysical logging of at a groundwater extraction well in the rural area of the Municipality of Corozal, Puerto Rico. Prior groundwater tests indicated possible contamination of the groundwater. The study area was primarily underlain by stratified, mostly dark gray basaltic tuff, andesite and basalt porphyry rocks assigned to ...


    By GeoView, Inc.

  • Sensitivity of response of LISST-ABS and OBS to size distribution changes

    This Note shows how the calibration of the LISST-ABS acoustic backscatter sensor and of optical backscatter sensor (OBS) changes when water contains a broad distribution of particle sizes, and why LISST-ABS is inherently superior. Particle size distributions in water are usually not very narrow, i.e. particles of more than a single size exist in suspension. It is common practice to consider ...


    By Sequoia Scientific, Inc.

  • A Guide to Noise Measurement Terminology

    There are 100s of different acoustic parameters that can be used during your noise measurements. Each parameter can tell you something different the noise you’re monitoring. How do you remember what all this noise measurement terminology means and what it does? We’ve already covered ...


    By Cirrus Research plc

  • Transducers – “A lifetime of quality”

    At Brüel & Kjær, transducers are a core part of our business. They have been for more than50 years – almost a lifetime! The quality of our transducers is world-renowned. It is the result of our unique experience and knowledge, backed up by meticulous testing and quality control. Experience, Knowledge and Innovation Our experience and knowledge, acquired over ...

  • Detecting Gases: What You Can`t Smell Can Hurt You

    Walking through a drill-site area, a worker smells rotten eggs and stops tor a minute or two to assess where a gas leak might exist. Rubbing his itchv eves as he investigates further, he notices that he no longer smells the tell¬tale hydrogen sulphide odour. He does not realize that the gas has deadened his olfactory senses and unless he leaves the area within seconds, he could lose ...

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