acoustic transducer Articles

  • 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 ...

  • Transducer shadow correction for applied technologies Sonic K-Probe

    In the K-probe, as in many sonic probes available today, the transducers at the ends of its acoustic paths cast a "shadow" on the paths, causing the measured wind velocity component along the path to be underestimated. The degree of attenuation is a function of the angle between the wind direction and the acoustic path which increases with decreasing angle, reaching a minimum at 0°. At angles ...

  • Cam correlation analysis using Acoustic discharge measurement

    The low head hydro power plant in Wettingen, Switzerland, is in operation since 1933 and no effective cam optimization has been carried out up to now. The goal of the measuring campaign was to provide data enabling an economic study for a retrofit and upgrade project of the plant and the measurement of the efficiency improvement of turbines after refurbishment. The contribution discusses cam ...


    By HydroVision GmbH

  • ESTECH marks twentieth year with new acoustic testing site

    Situated less than 40 km from the centre of Tokyo, the two storey building has a hemi-anechoic chamber, an excitation test room and an associated test preparation room. The excitation test room, which can be flexibly partitioned, contains two structural beds isolated from external vibration. And two cranes capable of lifting up to 2.8 tonnes, for moving heavy structures such as engines, tractor ...

  • Dynamic rotary torque measurement using surface acoustic waves

    The subject of torque measurement has previously been addressed extensively. Most of the existing transducers either rely on low voltage analogue systems (e.g. conventional resistive strain gauge) or complicated mechanical assemblies by physically assessing displacement, i.e. optical systems. This paper identifies a new, potentially low cost, non-contact, frequency domain strain torque sensor1 ...


    By Sensor Technology Ltd

  • ZE: 908 Acoustic Interface - The simple way to integrate noise measurements in industrial settings

    The ZE: 908 allows users to add a noise measurement capability to an existing process control system. The ZE:908 is a small, lightweight power supply and acoustic conditioning unit for microphone preamplifiers, it is ideal as a front-end for data logging and analysis systems where a simple and accurate acoustic input is required as an interface between an acoustic transducer and a process ...


    By Cirrus Research plc

  • ZE: 908 Acoustic Interface – The simple way to integrate noise measurements in industrial settings

    Cirrus Environmental, a leading specialist in the design and manufacture of environmental noise monitoring solutions provide a specially designed acoustic interface, ZE: 908, which allows users to add a noise measurement capability to an existing process control system. The ZE: 908 is a small, lightweight power supply and acoustic conditioning unit for microphone preamplifiers, it is ideal as a ...


    By Cirrus Environmental

  • ZE: 908 Acoustic Interface – The simple way to integrate noise measurements in industrial settings

    Cirrus Environmental, a leading specialist in the design and manufacture of environmental noise monitoring solutions provide a specially designed acoustic interface, ZE: 908, which allows users to add a noise measurement capability to an existing process control system. The ZE: 908 is a small, lightweight power supply and acoustic conditioning unit for microphone preamplifiers, it is ideal as a ...


    By Cirrus Environmental

  • Quarry crusher control

    Summary Pulsar supplied Level Star non-contacting ultrasonic level measurement to Croft quarry in Leicestershire to controlstone level in choke-fed tertiary crushers The Level Star provides relay closures to control the automatic feed to the crusher, maintaining the optimum level inthe crusher bowl to maximise production efficiency and consistency of stone size. The ...

  • Level Measurement Problems crushed

    Pulsar non-contacting ultrasonic level measurement equipment copes even with the harshest and noisiest conditions, as this case study looking at stone crusher level measurement proves. Pulsar supplied Level Star non-contacting ultrasonic level measurement to Croft quarry in Leicestershire to control stone level in choke-fed tertiary crushers. The Level Star provides relay closures to control the ...

  • National Aerospace Laboratories (CSIR) – celebrating 50 years of excellence

    National Aerospace Laboratories (NAL), Bangalore is a constituent of the Council of Scientific and Industrial Research of India (CSIR). Originally started as National Aeronautical Laboratory, it was renamed National Aerospace Laboratories to reflect its major involvement in the Indian space programme, its multidisciplinary activities and it’s global positioning. Over the last five decades ...

  • 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 ...

  • 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 ...

  • 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

  • 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

  • Brüel & Kjær accelerometers - 65 years of excellence

    The Thirties Already before the two young engineers Per V. Brüel and Viggo Kjær graduated as Masters of Electrical Engineering in 1939, they had decided to start a company together. However, they felt it was necessary to learn more and get some practical experience before actually going ahead, so P.V. Brüel became assistant to professor P.O. Pedersen in the newly created ...

  • PULSE FRC – frequency response correction compensation is a good thing

    Furthermore, increased flight operations can be conducted around more restrictive airports. The determination of an aircraft type’s noise is a complex process guided by documents such as: International Civil Aviation Organization(ICAO) Annex 16 – Environmental Protection, Volume I – Aircraft Noise Federal Aviation Administration (FAA)CFR14 PART 36 – Noise ...

  • 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.

  • Media expansion monitoring improves filtration

    In municipal surface water treatment plants, optimum filter performance is a crucial component. Filtration is the primary treatment process at water treatment plants, and backwashing is the primary means to keep filters functioning properly to produce safe drinking water for the public. Since 2000, Entech Design, Inc. has used underwater acoustic sensing technology to monitor filter media ...


    By Entech Design, Inc.

  • Keeping it clean; close watch over wastewater level case study

    Osem Industries Ltd. chooses SmartScan50 to measure the level of its wastewater facility. Osem Industries LTD is one of the biggest food manufacturing and marketing companies in Israel. The group produces more than 1,000 different food items currently manufactured in ten production plants. The Sderot plant is Osem’s most-southern manufacturing point in Israel. This plant, which in the early ...

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